From f077898d8bcace57da5cc5b9b1aa4f47d9d0e69a Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Tue, 31 Dec 2024 17:34:17 -0500
Subject: [PATCH 1/9] Pass through arguments for `script/test` to its `swift
 test` call.

Partial #596

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 script/test | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/script/test b/script/test
index 5f3a5e1a..9930ce97 100755
--- a/script/test
+++ b/script/test
@@ -12,5 +12,5 @@ printf $'==> ✅ Testing mas %s\n' "$(script/version)"
 
 script/generate_version_info_for_swift
 
-script -q /dev/null swift test |
+script -q /dev/null swift test "${@}" |
   (grep -vxE $'Test Suite \'.+\' (?:started|passed) at \\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}\\.\\d{3}\\.?\\r|Test Case \'-\\[.+\\]\' (?:started|passed \\(\\d+\\.\\d+ seconds\\))\\.\\r|\\t Executed \\d+ tests?, with 0 failures \\(0 unexpected\\) in \\d+\\.\\d+ \\(\\d+\\.\\d+\\) seconds\\r' || true)

From 33efcd4c6b830f55d535613c68934356c335c9e1 Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Tue, 31 Dec 2024 18:06:16 -0500
Subject: [PATCH 2/9] Rename XCTest files & classes in preparation for
 migrating them to Quick.

Partial #596

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 .../Errors/{MASErrorTestCase.swift => MASErrorSpec.swift}     | 4 ++--
 .../{NetworkManagerTests.swift => NetworkManagerSpec.swift}   | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)
 rename Tests/masTests/Errors/{MASErrorTestCase.swift => MASErrorSpec.swift} (97%)
 rename Tests/masTests/Network/{NetworkManagerTests.swift => NetworkManagerSpec.swift} (96%)

diff --git a/Tests/masTests/Errors/MASErrorTestCase.swift b/Tests/masTests/Errors/MASErrorSpec.swift
similarity index 97%
rename from Tests/masTests/Errors/MASErrorTestCase.swift
rename to Tests/masTests/Errors/MASErrorSpec.swift
index 4959b874..30e5bd17 100644
--- a/Tests/masTests/Errors/MASErrorTestCase.swift
+++ b/Tests/masTests/Errors/MASErrorSpec.swift
@@ -1,5 +1,5 @@
 //
-//  MASErrorTestCase.swift
+//  MASErrorSpec.swift
 //  masTests
 //
 //  Created by Ben Chatelain on 2/11/18.
@@ -11,7 +11,7 @@ import XCTest
 
 @testable import mas
 
-class MASErrorTestCase: XCTestCase {
+class MASErrorSpec: XCTestCase {
     private static let error = NSError(domain: "MAS", code: 999, userInfo: [NSLocalizedDescriptionKey: "foo"])
 
     override func setUp() {
diff --git a/Tests/masTests/Network/NetworkManagerTests.swift b/Tests/masTests/Network/NetworkManagerSpec.swift
similarity index 96%
rename from Tests/masTests/Network/NetworkManagerTests.swift
rename to Tests/masTests/Network/NetworkManagerSpec.swift
index 560f7ce9..a6cc69fa 100644
--- a/Tests/masTests/Network/NetworkManagerTests.swift
+++ b/Tests/masTests/Network/NetworkManagerSpec.swift
@@ -1,5 +1,5 @@
 //
-//  NetworkManagerTests.swift
+//  NetworkManagerSpec.swift
 //  masTests
 //
 //  Created by Ben Chatelain on 1/5/19.
@@ -10,7 +10,7 @@ import XCTest
 
 @testable import mas
 
-class NetworkManagerTests: XCTestCase {
+class NetworkManagerSpec: XCTestCase {
     override func setUp() {
         super.setUp()
         MAS.initialize()

From ad68b6ea5ea4c08573613e933cc731e09fb126e3 Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Tue, 31 Dec 2024 18:09:52 -0500
Subject: [PATCH 3/9] Migrate all vestigial XCTest tests to Quick.

Partial #596

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 .swiftlint.yml                                |   2 -
 Tests/masTests/Errors/MASErrorSpec.swift      | 153 +++++++++---------
 .../masTests/Network/NetworkManagerSpec.swift |  75 +++------
 3 files changed, 101 insertions(+), 129 deletions(-)

diff --git a/.swiftlint.yml b/.swiftlint.yml
index da0b8857..9dba4d3e 100644
--- a/.swiftlint.yml
+++ b/.swiftlint.yml
@@ -8,7 +8,6 @@
 opt_in_rules:
   - all
 disabled_rules:
-  - balanced_xctest_lifecycle
   - closure_body_length
   - contrasted_opening_brace
   - explicit_acl
@@ -26,7 +25,6 @@ disabled_rules:
   - no_grouping_extension
   - number_separator
   - one_declaration_per_file
-  - prefer_nimble
   - prefixed_toplevel_constant
   - quick_discouraged_call
   - quick_discouraged_pending_test
diff --git a/Tests/masTests/Errors/MASErrorSpec.swift b/Tests/masTests/Errors/MASErrorSpec.swift
index 30e5bd17..5f80f810 100644
--- a/Tests/masTests/Errors/MASErrorSpec.swift
+++ b/Tests/masTests/Errors/MASErrorSpec.swift
@@ -7,86 +7,87 @@
 //
 
 import Foundation
-import XCTest
+import Nimble
+import Quick
 
 @testable import mas
 
-class MASErrorSpec: XCTestCase {
+public class MASErrorSpec: QuickSpec {
     private static let error = NSError(domain: "MAS", code: 999, userInfo: [NSLocalizedDescriptionKey: "foo"])
 
-    override func setUp() {
-        super.setUp()
-        MAS.initialize()
-    }
-
-    func testNotSignedIn() {
-        XCTAssertEqual(MASError.notSignedIn.description, "Not signed in")
-    }
-
-    func testSignInFailed() {
-        XCTAssertEqual(MASError.signInFailed(error: nil).description, "Sign in failed")
-    }
-
-    func testSignInFailedError() {
-        XCTAssertEqual(MASError.signInFailed(error: Self.error).description, "Sign in failed: foo")
-    }
-
-    func testAlreadySignedIn() {
-        XCTAssertEqual(
-            MASError.alreadySignedIn(asAppleID: "person@example.com").description,
-            "Already signed in as person@example.com"
-        )
-    }
-
-    func testPurchaseFailed() {
-        XCTAssertEqual(MASError.purchaseFailed(error: nil).description, "Download request failed")
-    }
-
-    func testPurchaseFailedError() {
-        XCTAssertEqual(MASError.purchaseFailed(error: Self.error).description, "Download request failed: foo")
-    }
-
-    func testDownloadFailed() {
-        XCTAssertEqual(MASError.downloadFailed(error: nil).description, "Download failed")
-    }
-
-    func testDownloadFailedError() {
-        XCTAssertEqual(MASError.downloadFailed(error: Self.error).description, "Download failed: foo")
-    }
-
-    func testNoDownloads() {
-        XCTAssertEqual(MASError.noDownloads.description, "No downloads began")
-    }
-
-    func testCancelled() {
-        XCTAssertEqual(MASError.cancelled.description, "Download cancelled")
-    }
-
-    func testSearchFailed() {
-        XCTAssertEqual(MASError.searchFailed.description, "Search failed")
-    }
-
-    func testNoSearchResultsFound() {
-        XCTAssertEqual(MASError.noSearchResultsFound.description, "No apps found")
-    }
-
-    func testNoVendorWebsite() {
-        XCTAssertEqual(MASError.noVendorWebsite.description, "App does not have a vendor website")
-    }
-
-    func testNotInstalled() {
-        XCTAssertEqual(MASError.notInstalled(appID: 123).description, "No apps installed with app ID 123")
-    }
-
-    func testUninstallFailed() {
-        XCTAssertEqual(MASError.uninstallFailed(error: nil).description, "Uninstall failed")
-    }
-
-    func testNoData() {
-        XCTAssertEqual(MASError.noData.description, "Service did not return data")
-    }
-
-    func testJsonParsing() {
-        XCTAssertEqual(MASError.jsonParsing(data: Data()).description, "Unable to parse response as JSON:\n")
+    override public func spec() {
+        beforeSuite {
+            MAS.initialize()
+        }
+        describe("mas error") {
+            it("NotSignedIn") {
+                expect(MASError.notSignedIn.description) == "Not signed in"
+            }
+
+            it("SignInFailed") {
+                expect(MASError.signInFailed(error: nil).description) == "Sign in failed"
+            }
+
+            it("SignInFailedError") {
+                expect(MASError.signInFailed(error: Self.error).description) == "Sign in failed: foo"
+            }
+
+            it("AlreadySignedIn") {
+                expect(MASError.alreadySignedIn(asAppleID: "person@example.com").description)
+                    == "Already signed in as person@example.com"
+            }
+
+            it("PurchaseFailed") {
+                expect(MASError.purchaseFailed(error: nil).description) == "Download request failed"
+            }
+
+            it("PurchaseFailedError") {
+                expect(MASError.purchaseFailed(error: Self.error).description) == "Download request failed: foo"
+            }
+
+            it("DownloadFailed") {
+                expect(MASError.downloadFailed(error: nil).description) == "Download failed"
+            }
+
+            it("DownloadFailedError") {
+                expect(MASError.downloadFailed(error: Self.error).description) == "Download failed: foo"
+            }
+
+            it("NoDownloads") {
+                expect(MASError.noDownloads.description) == "No downloads began"
+            }
+
+            it("Cancelled") {
+                expect(MASError.cancelled.description) == "Download cancelled"
+            }
+
+            it("SearchFailed") {
+                expect(MASError.searchFailed.description) == "Search failed"
+            }
+
+            it("NoSearchResultsFound") {
+                expect(MASError.noSearchResultsFound.description) == "No apps found"
+            }
+
+            it("NoVendorWebsite") {
+                expect(MASError.noVendorWebsite.description) == "App does not have a vendor website"
+            }
+
+            it("NotInstalled") {
+                expect(MASError.notInstalled(appID: 123).description) == "No apps installed with app ID 123"
+            }
+
+            it("UninstallFailed") {
+                expect(MASError.uninstallFailed(error: nil).description) == "Uninstall failed"
+            }
+
+            it("NoData") {
+                expect(MASError.noData.description) == "Service did not return data"
+            }
+
+            it("JsonParsing") {
+                expect(MASError.jsonParsing(data: Data()).description) == "Unable to parse response as JSON:\n"
+            }
+        }
     }
 }
diff --git a/Tests/masTests/Network/NetworkManagerSpec.swift b/Tests/masTests/Network/NetworkManagerSpec.swift
index a6cc69fa..015943e5 100644
--- a/Tests/masTests/Network/NetworkManagerSpec.swift
+++ b/Tests/masTests/Network/NetworkManagerSpec.swift
@@ -6,63 +6,36 @@
 //  Copyright © 2019 mas-cli. All rights reserved.
 //
 
-import XCTest
+import Foundation
+import Nimble
+import Quick
 
 @testable import mas
 
-class NetworkManagerSpec: XCTestCase {
-    override func setUp() {
-        super.setUp()
-        MAS.initialize()
-    }
-
-    func testSuccessfulAsyncResponse() throws {
-        let data = Data([0, 1, 0, 1])
-        XCTAssertEqual(
-            try NetworkManager(session: MockNetworkSession(data: data))
-                .loadData(from: URL(fileURLWithPath: "url"))
-                .wait(),
-            data
-        )
-    }
-
-    func testSuccessfulSyncResponse() throws {
-        let data = Data([0, 1, 0, 1])
-        XCTAssertEqual(
-            try NetworkManager(session: MockNetworkSession(data: data))
-                .loadData(from: URL(fileURLWithPath: "url"))
-                .wait(),
-            data
-        )
-    }
-
-    func testFailureAsyncResponse() {
-        XCTAssertThrowsError(
-            try NetworkManager(session: MockNetworkSession(error: MASError.noData))
-                .loadData(from: URL(fileURLWithPath: "url"))
-                .wait()
-        ) { error in
-            guard let masError = error as? MASError else {
-                XCTFail("Error is of unexpected type.")
-                return
-            }
-
-            XCTAssertEqual(masError, MASError.noData)
+public class NetworkManagerSpec: QuickSpec {
+    override public func spec() {
+        beforeSuite {
+            MAS.initialize()
         }
-    }
-
-    func testFailureSyncResponse() {
-        XCTAssertThrowsError(
-            try NetworkManager(session: MockNetworkSession(error: MASError.noData))
-                .loadData(from: URL(fileURLWithPath: "url"))
-                .wait()
-        ) { error in
-            guard let error = error as? MASError else {
-                XCTFail("Error is of unexpected type.")
-                return
+        describe("network manager") {
+            it("returns data") {
+                let data = Data([0, 1, 0, 1])
+                expect(
+                    try NetworkManager(session: MockNetworkSession(data: data))
+                        .loadData(from: URL(fileURLWithPath: "url"))
+                        .wait()
+                )
+                    == data
             }
 
-            XCTAssertEqual(error, MASError.noData)
+            it("throws no data error") {
+                expect(
+                    try NetworkManager(session: MockNetworkSession(error: MASError.noData))
+                        .loadData(from: URL(fileURLWithPath: "url"))
+                        .wait()
+                )
+                .to(throwError(MASError.noData))
+            }
         }
     }
 }

From ecb1070f2a98757ca9b341d8678d929512c1e6bf Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Tue, 31 Dec 2024 18:12:07 -0500
Subject: [PATCH 4/9] Remove useless tests.

Partial #596

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 Tests/masTests/Commands/ResetSpec.swift       | 28 ------
 .../SoftwareMapAppLibrarySpec.swift           | 47 ----------
 Tests/masTests/Errors/MASErrorSpec.swift      | 93 -------------------
 .../masTests/Network/MockNetworkSession.swift | 38 --------
 .../masTests/Network/NetworkManagerSpec.swift | 41 --------
 5 files changed, 247 deletions(-)
 delete mode 100644 Tests/masTests/Commands/ResetSpec.swift
 delete mode 100644 Tests/masTests/Controllers/SoftwareMapAppLibrarySpec.swift
 delete mode 100644 Tests/masTests/Errors/MASErrorSpec.swift
 delete mode 100644 Tests/masTests/Network/MockNetworkSession.swift
 delete mode 100644 Tests/masTests/Network/NetworkManagerSpec.swift

diff --git a/Tests/masTests/Commands/ResetSpec.swift b/Tests/masTests/Commands/ResetSpec.swift
deleted file mode 100644
index 96e8adb2..00000000
--- a/Tests/masTests/Commands/ResetSpec.swift
+++ /dev/null
@@ -1,28 +0,0 @@
-//
-//  ResetSpec.swift
-//  masTests
-//
-//  Created by Ben Chatelain on 2018-12-28.
-//  Copyright © 2018 mas-cli. All rights reserved.
-//
-
-import Nimble
-import Quick
-
-@testable import mas
-
-public class ResetSpec: QuickSpec {
-    override public func spec() {
-        beforeSuite {
-            MAS.initialize()
-        }
-        describe("reset command") {
-            it("resets the App Store state") {
-                expect {
-                    try MAS.Reset.parse([]).run()
-                }
-                .toNot(throwError())
-            }
-        }
-    }
-}
diff --git a/Tests/masTests/Controllers/SoftwareMapAppLibrarySpec.swift b/Tests/masTests/Controllers/SoftwareMapAppLibrarySpec.swift
deleted file mode 100644
index a2e1f6a5..00000000
--- a/Tests/masTests/Controllers/SoftwareMapAppLibrarySpec.swift
+++ /dev/null
@@ -1,47 +0,0 @@
-//
-//  SoftwareMapAppLibrarySpec.swift
-//  masTests
-//
-//  Created by Ben Chatelain on 3/1/20.
-//  Copyright © 2020 mas-cli. All rights reserved.
-//
-
-import Nimble
-import Quick
-
-@testable import mas
-
-public class SoftwareMapAppLibrarySpec: QuickSpec {
-    override public func spec() {
-        let myApp = MockSoftwareProduct(
-            appName: "MyApp",
-            bundleIdentifier: "com.example",
-            bundlePath: "/Applications/MyApp.app",
-            bundleVersion: "1.0.0",
-            itemIdentifier: 1234
-        )
-
-        let apps = [myApp]
-
-        let library = SoftwareMapAppLibrary(softwareMap: MockSoftwareMap(products: apps))
-
-        beforeSuite {
-            MAS.initialize()
-        }
-        describe("mas app library") {
-            it("contains all installed apps") {
-                expect(library.installedApps).to(haveCount(apps.count))
-                expect(library.installedApps.first!.appName) == myApp.appName
-            }
-        }
-    }
-}
-
-// MARK: - MockSoftwareMap
-struct MockSoftwareMap: SoftwareMap {
-    let products: [SoftwareProduct]
-
-    func allSoftwareProducts() -> [SoftwareProduct] {
-        products
-    }
-}
diff --git a/Tests/masTests/Errors/MASErrorSpec.swift b/Tests/masTests/Errors/MASErrorSpec.swift
deleted file mode 100644
index 5f80f810..00000000
--- a/Tests/masTests/Errors/MASErrorSpec.swift
+++ /dev/null
@@ -1,93 +0,0 @@
-//
-//  MASErrorSpec.swift
-//  masTests
-//
-//  Created by Ben Chatelain on 2/11/18.
-//  Copyright © 2018 Andrew Naylor. All rights reserved.
-//
-
-import Foundation
-import Nimble
-import Quick
-
-@testable import mas
-
-public class MASErrorSpec: QuickSpec {
-    private static let error = NSError(domain: "MAS", code: 999, userInfo: [NSLocalizedDescriptionKey: "foo"])
-
-    override public func spec() {
-        beforeSuite {
-            MAS.initialize()
-        }
-        describe("mas error") {
-            it("NotSignedIn") {
-                expect(MASError.notSignedIn.description) == "Not signed in"
-            }
-
-            it("SignInFailed") {
-                expect(MASError.signInFailed(error: nil).description) == "Sign in failed"
-            }
-
-            it("SignInFailedError") {
-                expect(MASError.signInFailed(error: Self.error).description) == "Sign in failed: foo"
-            }
-
-            it("AlreadySignedIn") {
-                expect(MASError.alreadySignedIn(asAppleID: "person@example.com").description)
-                    == "Already signed in as person@example.com"
-            }
-
-            it("PurchaseFailed") {
-                expect(MASError.purchaseFailed(error: nil).description) == "Download request failed"
-            }
-
-            it("PurchaseFailedError") {
-                expect(MASError.purchaseFailed(error: Self.error).description) == "Download request failed: foo"
-            }
-
-            it("DownloadFailed") {
-                expect(MASError.downloadFailed(error: nil).description) == "Download failed"
-            }
-
-            it("DownloadFailedError") {
-                expect(MASError.downloadFailed(error: Self.error).description) == "Download failed: foo"
-            }
-
-            it("NoDownloads") {
-                expect(MASError.noDownloads.description) == "No downloads began"
-            }
-
-            it("Cancelled") {
-                expect(MASError.cancelled.description) == "Download cancelled"
-            }
-
-            it("SearchFailed") {
-                expect(MASError.searchFailed.description) == "Search failed"
-            }
-
-            it("NoSearchResultsFound") {
-                expect(MASError.noSearchResultsFound.description) == "No apps found"
-            }
-
-            it("NoVendorWebsite") {
-                expect(MASError.noVendorWebsite.description) == "App does not have a vendor website"
-            }
-
-            it("NotInstalled") {
-                expect(MASError.notInstalled(appID: 123).description) == "No apps installed with app ID 123"
-            }
-
-            it("UninstallFailed") {
-                expect(MASError.uninstallFailed(error: nil).description) == "Uninstall failed"
-            }
-
-            it("NoData") {
-                expect(MASError.noData.description) == "Service did not return data"
-            }
-
-            it("JsonParsing") {
-                expect(MASError.jsonParsing(data: Data()).description) == "Unable to parse response as JSON:\n"
-            }
-        }
-    }
-}
diff --git a/Tests/masTests/Network/MockNetworkSession.swift b/Tests/masTests/Network/MockNetworkSession.swift
deleted file mode 100644
index 3bd3b82c..00000000
--- a/Tests/masTests/Network/MockNetworkSession.swift
+++ /dev/null
@@ -1,38 +0,0 @@
-//
-//  MockNetworkSession
-//  masTests
-//
-//  Created by Ben Chatelain on 11/13/18.
-//  Copyright © 2018 mas-cli. All rights reserved.
-//
-
-import Foundation
-import PromiseKit
-
-@testable import mas
-
-/// Mock NetworkSession for testing.
-struct MockNetworkSession: NetworkSession {
-    // Properties that enable us to set exactly what data or error
-    // we want our mocked URLSession to return for any request.
-    private let data: Data?
-    private let error: Error?
-
-    init(data: Data) {
-        self.data = data
-        error = nil
-    }
-
-    init(error: Error) {
-        self.error = error
-        data = nil
-    }
-
-    func loadData(from _: URL) -> Promise<Data> {
-        guard let data else {
-            return Promise(error: error ?? MASError.noData)
-        }
-
-        return .value(data)
-    }
-}
diff --git a/Tests/masTests/Network/NetworkManagerSpec.swift b/Tests/masTests/Network/NetworkManagerSpec.swift
deleted file mode 100644
index 015943e5..00000000
--- a/Tests/masTests/Network/NetworkManagerSpec.swift
+++ /dev/null
@@ -1,41 +0,0 @@
-//
-//  NetworkManagerSpec.swift
-//  masTests
-//
-//  Created by Ben Chatelain on 1/5/19.
-//  Copyright © 2019 mas-cli. All rights reserved.
-//
-
-import Foundation
-import Nimble
-import Quick
-
-@testable import mas
-
-public class NetworkManagerSpec: QuickSpec {
-    override public func spec() {
-        beforeSuite {
-            MAS.initialize()
-        }
-        describe("network manager") {
-            it("returns data") {
-                let data = Data([0, 1, 0, 1])
-                expect(
-                    try NetworkManager(session: MockNetworkSession(data: data))
-                        .loadData(from: URL(fileURLWithPath: "url"))
-                        .wait()
-                )
-                    == data
-            }
-
-            it("throws no data error") {
-                expect(
-                    try NetworkManager(session: MockNetworkSession(error: MASError.noData))
-                        .loadData(from: URL(fileURLWithPath: "url"))
-                        .wait()
-                )
-                .to(throwError(MASError.noData))
-            }
-        }
-    }
-}

From ad3898a404d44246e75fe5b8b876534e6d427007 Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Tue, 31 Dec 2024 19:18:28 -0500
Subject: [PATCH 5/9] Make all test classes `final`.

Partial #596

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 .swiftlint.yml                                                  | 1 -
 Tests/masTests/Commands/AccountSpec.swift                       | 2 +-
 Tests/masTests/Commands/HomeSpec.swift                          | 2 +-
 Tests/masTests/Commands/InfoSpec.swift                          | 2 +-
 Tests/masTests/Commands/InstallSpec.swift                       | 2 +-
 Tests/masTests/Commands/ListSpec.swift                          | 2 +-
 Tests/masTests/Commands/LuckySpec.swift                         | 2 +-
 Tests/masTests/Commands/OpenSpec.swift                          | 2 +-
 Tests/masTests/Commands/OutdatedSpec.swift                      | 2 +-
 Tests/masTests/Commands/PurchaseSpec.swift                      | 2 +-
 Tests/masTests/Commands/SearchSpec.swift                        | 2 +-
 Tests/masTests/Commands/SignInSpec.swift                        | 2 +-
 Tests/masTests/Commands/SignOutSpec.swift                       | 2 +-
 Tests/masTests/Commands/UninstallSpec.swift                     | 2 +-
 Tests/masTests/Commands/UpgradeSpec.swift                       | 2 +-
 Tests/masTests/Commands/VendorSpec.swift                        | 2 +-
 Tests/masTests/Commands/VersionSpec.swift                       | 2 +-
 .../masTests/Controllers/ITunesSearchAppStoreSearcherSpec.swift | 2 +-
 Tests/masTests/Formatters/AppListFormatterSpec.swift            | 2 +-
 Tests/masTests/Formatters/SearchResultFormatterSpec.swift       | 2 +-
 Tests/masTests/Models/SearchResultListSpec.swift                | 2 +-
 Tests/masTests/Models/SearchResultSpec.swift                    | 2 +-
 Tests/masTests/Models/SoftwareProductSpec.swift                 | 2 +-
 23 files changed, 22 insertions(+), 23 deletions(-)

diff --git a/.swiftlint.yml b/.swiftlint.yml
index 9dba4d3e..8a2f55e7 100644
--- a/.swiftlint.yml
+++ b/.swiftlint.yml
@@ -16,7 +16,6 @@ disabled_rules:
   - explicit_type_interface
   - file_header
   - file_name
-  - final_test_case
   - force_unwrapping
   - function_body_length
   - inert_defer
diff --git a/Tests/masTests/Commands/AccountSpec.swift b/Tests/masTests/Commands/AccountSpec.swift
index 8885916f..2b12090b 100644
--- a/Tests/masTests/Commands/AccountSpec.swift
+++ b/Tests/masTests/Commands/AccountSpec.swift
@@ -12,7 +12,7 @@ import Quick
 @testable import mas
 
 /// Deprecated test.
-public class AccountSpec: QuickSpec {
+public final class AccountSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/HomeSpec.swift b/Tests/masTests/Commands/HomeSpec.swift
index 63aba535..341cffb1 100644
--- a/Tests/masTests/Commands/HomeSpec.swift
+++ b/Tests/masTests/Commands/HomeSpec.swift
@@ -11,7 +11,7 @@ import Quick
 
 @testable import mas
 
-public class HomeSpec: QuickSpec {
+public final class HomeSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/InfoSpec.swift b/Tests/masTests/Commands/InfoSpec.swift
index 423c1d4d..45f24050 100644
--- a/Tests/masTests/Commands/InfoSpec.swift
+++ b/Tests/masTests/Commands/InfoSpec.swift
@@ -12,7 +12,7 @@ import Quick
 
 @testable import mas
 
-public class InfoSpec: QuickSpec {
+public final class InfoSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/InstallSpec.swift b/Tests/masTests/Commands/InstallSpec.swift
index ea253f79..e04fa5c4 100644
--- a/Tests/masTests/Commands/InstallSpec.swift
+++ b/Tests/masTests/Commands/InstallSpec.swift
@@ -11,7 +11,7 @@ import Quick
 
 @testable import mas
 
-public class InstallSpec: QuickSpec {
+public final class InstallSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/ListSpec.swift b/Tests/masTests/Commands/ListSpec.swift
index e9c02d60..5b5760a2 100644
--- a/Tests/masTests/Commands/ListSpec.swift
+++ b/Tests/masTests/Commands/ListSpec.swift
@@ -12,7 +12,7 @@ import Quick
 
 @testable import mas
 
-public class ListSpec: QuickSpec {
+public final class ListSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/LuckySpec.swift b/Tests/masTests/Commands/LuckySpec.swift
index e2887390..9227d219 100644
--- a/Tests/masTests/Commands/LuckySpec.swift
+++ b/Tests/masTests/Commands/LuckySpec.swift
@@ -11,7 +11,7 @@ import Quick
 
 @testable import mas
 
-public class LuckySpec: QuickSpec {
+public final class LuckySpec: QuickSpec {
     override public func spec() {
         let networkSession = MockFromFileNetworkSession(responseFile: "search/slack.json")
         let searcher = ITunesSearchAppStoreSearcher(networkManager: NetworkManager(session: networkSession))
diff --git a/Tests/masTests/Commands/OpenSpec.swift b/Tests/masTests/Commands/OpenSpec.swift
index 16a46665..74085314 100644
--- a/Tests/masTests/Commands/OpenSpec.swift
+++ b/Tests/masTests/Commands/OpenSpec.swift
@@ -12,7 +12,7 @@ import Quick
 
 @testable import mas
 
-public class OpenSpec: QuickSpec {
+public final class OpenSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/OutdatedSpec.swift b/Tests/masTests/Commands/OutdatedSpec.swift
index ff696a8b..f88bf544 100644
--- a/Tests/masTests/Commands/OutdatedSpec.swift
+++ b/Tests/masTests/Commands/OutdatedSpec.swift
@@ -12,7 +12,7 @@ import Quick
 
 @testable import mas
 
-public class OutdatedSpec: QuickSpec {
+public final class OutdatedSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/PurchaseSpec.swift b/Tests/masTests/Commands/PurchaseSpec.swift
index 1ab423ba..f2a6d20d 100644
--- a/Tests/masTests/Commands/PurchaseSpec.swift
+++ b/Tests/masTests/Commands/PurchaseSpec.swift
@@ -11,7 +11,7 @@ import Quick
 
 @testable import mas
 
-public class PurchaseSpec: QuickSpec {
+public final class PurchaseSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/SearchSpec.swift b/Tests/masTests/Commands/SearchSpec.swift
index afc6637a..715ca1ab 100644
--- a/Tests/masTests/Commands/SearchSpec.swift
+++ b/Tests/masTests/Commands/SearchSpec.swift
@@ -12,7 +12,7 @@ import Quick
 
 @testable import mas
 
-public class SearchSpec: QuickSpec {
+public final class SearchSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/SignInSpec.swift b/Tests/masTests/Commands/SignInSpec.swift
index 57b8292d..22724562 100644
--- a/Tests/masTests/Commands/SignInSpec.swift
+++ b/Tests/masTests/Commands/SignInSpec.swift
@@ -12,7 +12,7 @@ import Quick
 @testable import mas
 
 /// Deprecated test.
-public class SignInSpec: QuickSpec {
+public final class SignInSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/SignOutSpec.swift b/Tests/masTests/Commands/SignOutSpec.swift
index 7aeaa01b..bc7cfcdf 100644
--- a/Tests/masTests/Commands/SignOutSpec.swift
+++ b/Tests/masTests/Commands/SignOutSpec.swift
@@ -11,7 +11,7 @@ import Quick
 
 @testable import mas
 
-public class SignOutSpec: QuickSpec {
+public final class SignOutSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/UninstallSpec.swift b/Tests/masTests/Commands/UninstallSpec.swift
index 24de94da..7bfae829 100644
--- a/Tests/masTests/Commands/UninstallSpec.swift
+++ b/Tests/masTests/Commands/UninstallSpec.swift
@@ -12,7 +12,7 @@ import Quick
 
 @testable import mas
 
-public class UninstallSpec: QuickSpec {
+public final class UninstallSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/UpgradeSpec.swift b/Tests/masTests/Commands/UpgradeSpec.swift
index c3a805f9..f1d4b844 100644
--- a/Tests/masTests/Commands/UpgradeSpec.swift
+++ b/Tests/masTests/Commands/UpgradeSpec.swift
@@ -12,7 +12,7 @@ import Quick
 
 @testable import mas
 
-public class UpgradeSpec: QuickSpec {
+public final class UpgradeSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/VendorSpec.swift b/Tests/masTests/Commands/VendorSpec.swift
index 753b86cc..ffade499 100644
--- a/Tests/masTests/Commands/VendorSpec.swift
+++ b/Tests/masTests/Commands/VendorSpec.swift
@@ -11,7 +11,7 @@ import Quick
 
 @testable import mas
 
-public class VendorSpec: QuickSpec {
+public final class VendorSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Commands/VersionSpec.swift b/Tests/masTests/Commands/VersionSpec.swift
index ec66b558..fe456ed1 100644
--- a/Tests/masTests/Commands/VersionSpec.swift
+++ b/Tests/masTests/Commands/VersionSpec.swift
@@ -12,7 +12,7 @@ import Quick
 
 @testable import mas
 
-public class VersionSpec: QuickSpec {
+public final class VersionSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Controllers/ITunesSearchAppStoreSearcherSpec.swift b/Tests/masTests/Controllers/ITunesSearchAppStoreSearcherSpec.swift
index 3107aa2e..1537542c 100644
--- a/Tests/masTests/Controllers/ITunesSearchAppStoreSearcherSpec.swift
+++ b/Tests/masTests/Controllers/ITunesSearchAppStoreSearcherSpec.swift
@@ -11,7 +11,7 @@ import Quick
 
 @testable import mas
 
-public class ITunesSearchAppStoreSearcherSpec: QuickSpec {
+public final class ITunesSearchAppStoreSearcherSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Formatters/AppListFormatterSpec.swift b/Tests/masTests/Formatters/AppListFormatterSpec.swift
index a44730ca..d68a5878 100644
--- a/Tests/masTests/Formatters/AppListFormatterSpec.swift
+++ b/Tests/masTests/Formatters/AppListFormatterSpec.swift
@@ -11,7 +11,7 @@ import Quick
 
 @testable import mas
 
-public class AppListFormatterSpec: QuickSpec {
+public final class AppListFormatterSpec: QuickSpec {
     override public func spec() {
         // static func reference
         let format = AppListFormatter.format(products:)
diff --git a/Tests/masTests/Formatters/SearchResultFormatterSpec.swift b/Tests/masTests/Formatters/SearchResultFormatterSpec.swift
index bff6201e..15d13e8e 100644
--- a/Tests/masTests/Formatters/SearchResultFormatterSpec.swift
+++ b/Tests/masTests/Formatters/SearchResultFormatterSpec.swift
@@ -11,7 +11,7 @@ import Quick
 
 @testable import mas
 
-public class SearchResultFormatterSpec: QuickSpec {
+public final class SearchResultFormatterSpec: QuickSpec {
     override public func spec() {
         // static func reference
         let format = SearchResultFormatter.format(results:includePrice:)
diff --git a/Tests/masTests/Models/SearchResultListSpec.swift b/Tests/masTests/Models/SearchResultListSpec.swift
index 7895b1c6..ac6e3118 100644
--- a/Tests/masTests/Models/SearchResultListSpec.swift
+++ b/Tests/masTests/Models/SearchResultListSpec.swift
@@ -12,7 +12,7 @@ import Quick
 
 @testable import mas
 
-public class SearchResultListSpec: QuickSpec {
+public final class SearchResultListSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Models/SearchResultSpec.swift b/Tests/masTests/Models/SearchResultSpec.swift
index 50436ceb..d800c748 100644
--- a/Tests/masTests/Models/SearchResultSpec.swift
+++ b/Tests/masTests/Models/SearchResultSpec.swift
@@ -12,7 +12,7 @@ import Quick
 
 @testable import mas
 
-public class SearchResultSpec: QuickSpec {
+public final class SearchResultSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
diff --git a/Tests/masTests/Models/SoftwareProductSpec.swift b/Tests/masTests/Models/SoftwareProductSpec.swift
index c8e81cde..8598a229 100644
--- a/Tests/masTests/Models/SoftwareProductSpec.swift
+++ b/Tests/masTests/Models/SoftwareProductSpec.swift
@@ -12,7 +12,7 @@ import Quick
 
 @testable import mas
 
-public class SoftwareProductSpec: QuickSpec {
+public final class SoftwareProductSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()

From 6a37882311a2e64efd9950365a7c488a91a69a9b Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Tue, 31 Dec 2024 19:29:06 -0500
Subject: [PATCH 6/9] Move test variable declarations & assignments to proper
 places.

Partial #596

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 Tests/masTests/Commands/UninstallSpec.swift   | 18 ++++++------
 .../masTests/Models/SoftwareProductSpec.swift | 29 ++++++++-----------
 2 files changed, 21 insertions(+), 26 deletions(-)

diff --git a/Tests/masTests/Commands/UninstallSpec.swift b/Tests/masTests/Commands/UninstallSpec.swift
index 7bfae829..212c7d83 100644
--- a/Tests/masTests/Commands/UninstallSpec.swift
+++ b/Tests/masTests/Commands/UninstallSpec.swift
@@ -14,19 +14,19 @@ import Quick
 
 public final class UninstallSpec: QuickSpec {
     override public func spec() {
+        let appID: AppID = 12345
+        let app = MockSoftwareProduct(
+            appName: "Some App",
+            bundleIdentifier: "com.some.app",
+            bundlePath: "/tmp/Some.app",
+            bundleVersion: "1.0",
+            itemIdentifier: NSNumber(value: appID)
+        )
+
         beforeSuite {
             MAS.initialize()
         }
         xdescribe("uninstall command") {
-            let appID: AppID = 12345
-            let app = MockSoftwareProduct(
-                appName: "Some App",
-                bundleIdentifier: "com.some.app",
-                bundlePath: "/tmp/Some.app",
-                bundleVersion: "1.0",
-                itemIdentifier: NSNumber(value: appID)
-            )
-
             context("dry run") {
                 let uninstall = try! MAS.Uninstall.parse(["--dry-run", String(appID)])
 
diff --git a/Tests/masTests/Models/SoftwareProductSpec.swift b/Tests/masTests/Models/SoftwareProductSpec.swift
index 8598a229..44cd4838 100644
--- a/Tests/masTests/Models/SoftwareProductSpec.swift
+++ b/Tests/masTests/Models/SoftwareProductSpec.swift
@@ -14,34 +14,29 @@ import Quick
 
 public final class SoftwareProductSpec: QuickSpec {
     override public func spec() {
+        let app = MockSoftwareProduct(
+            appName: "App",
+            bundleIdentifier: "",
+            bundlePath: "",
+            bundleVersion: "1.0.0",
+            itemIdentifier: 111
+        )
+
         beforeSuite {
             MAS.initialize()
         }
         describe("software product") {
-            let app = MockSoftwareProduct(
-                appName: "App",
-                bundleIdentifier: "",
-                bundlePath: "",
-                bundleVersion: "1.0.0",
-                itemIdentifier: 111
-            )
-
-            let currentApp = SearchResult(version: "1.0.0")
-            let appUpdate = SearchResult(version: "2.0.0")
-            let higherOs = SearchResult(minimumOsVersion: "99.0.0", version: "3.0.0")
-            let updateIos = SearchResult(minimumOsVersion: "99.0.0", version: "3.0.0")
-
             it("is not outdated when there is no new version available") {
-                expect(app.isOutdated(comparedTo: currentApp)) == false
+                expect(app.isOutdated(comparedTo: SearchResult(version: "1.0.0"))) == false
             }
             it("is outdated when there is a new version available") {
-                expect(app.isOutdated(comparedTo: appUpdate)) == true
+                expect(app.isOutdated(comparedTo: SearchResult(version: "2.0.0"))) == true
             }
             it("is not outdated when the new version of mac-software requires a higher OS version") {
-                expect(app.isOutdated(comparedTo: higherOs)) == false
+                expect(app.isOutdated(comparedTo: SearchResult(minimumOsVersion: "99.0.0", version: "3.0.0"))) == false
             }
             it("is not outdated when the new version of software requires a higher OS version") {
-                expect(app.isOutdated(comparedTo: updateIos)) == false
+                expect(app.isOutdated(comparedTo: SearchResult(minimumOsVersion: "99.0.0", version: "3.0.0"))) == false
             }
         }
     }

From f49d63a4f33a091adcb943f5834f5da440e5a695 Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Wed, 1 Jan 2025 07:12:06 -0500
Subject: [PATCH 7/9] Simplify test exclusion.

Partial #596

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 Tests/masTests/Commands/InstallSpec.swift  | 2 +-
 Tests/masTests/Commands/LuckySpec.swift    | 2 +-
 Tests/masTests/Commands/PurchaseSpec.swift | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Tests/masTests/Commands/InstallSpec.swift b/Tests/masTests/Commands/InstallSpec.swift
index e04fa5c4..61d25078 100644
--- a/Tests/masTests/Commands/InstallSpec.swift
+++ b/Tests/masTests/Commands/InstallSpec.swift
@@ -17,7 +17,7 @@ public final class InstallSpec: QuickSpec {
             MAS.initialize()
         }
         xdescribe("install command") {
-            xit("installs apps") {
+            it("installs apps") {
                 expect {
                     try MAS.Install.parse([]).run(appLibrary: MockAppLibrary(), searcher: MockAppStoreSearcher())
                 }
diff --git a/Tests/masTests/Commands/LuckySpec.swift b/Tests/masTests/Commands/LuckySpec.swift
index 9227d219..741efeb8 100644
--- a/Tests/masTests/Commands/LuckySpec.swift
+++ b/Tests/masTests/Commands/LuckySpec.swift
@@ -20,7 +20,7 @@ public final class LuckySpec: QuickSpec {
             MAS.initialize()
         }
         xdescribe("lucky command") {
-            xit("installs the first app matching a search") {
+            it("installs the first app matching a search") {
                 expect {
                     try MAS.Lucky.parse(["Slack"]).run(appLibrary: MockAppLibrary(), searcher: searcher)
                 }
diff --git a/Tests/masTests/Commands/PurchaseSpec.swift b/Tests/masTests/Commands/PurchaseSpec.swift
index f2a6d20d..6df46025 100644
--- a/Tests/masTests/Commands/PurchaseSpec.swift
+++ b/Tests/masTests/Commands/PurchaseSpec.swift
@@ -17,7 +17,7 @@ public final class PurchaseSpec: QuickSpec {
             MAS.initialize()
         }
         xdescribe("purchase command") {
-            xit("purchases apps") {
+            it("purchases apps") {
                 expect {
                     try MAS.Purchase.parse(["999"]).run(appLibrary: MockAppLibrary(), searcher: MockAppStoreSearcher())
                 }

From 905c4f79826a86c7d6cac0941afb581ee4a6b1af Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Tue, 31 Dec 2024 22:56:41 -0500
Subject: [PATCH 8/9] Improve value, error & captured stream comparisons.

Partial #596

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 Tests/masTests/.swiftlint.yml                 |  1 +
 Tests/masTests/Commands/AccountSpec.swift     | 12 +--
 Tests/masTests/Commands/HomeSpec.swift        |  6 +-
 Tests/masTests/Commands/InfoSpec.swift        | 35 ++++----
 Tests/masTests/Commands/InstallSpec.swift     | 10 ++-
 Tests/masTests/Commands/ListSpec.swift        |  9 +-
 Tests/masTests/Commands/LuckySpec.swift       |  8 +-
 Tests/masTests/Commands/OpenSpec.swift        |  7 +-
 Tests/masTests/Commands/OutdatedSpec.swift    | 10 +--
 Tests/masTests/Commands/PurchaseSpec.swift    | 11 ++-
 Tests/masTests/Commands/SearchSpec.swift      | 17 ++--
 Tests/masTests/Commands/SignInSpec.swift      |  7 +-
 Tests/masTests/Commands/SignOutSpec.swift     |  6 +-
 Tests/masTests/Commands/UninstallSpec.swift   | 36 +++-----
 Tests/masTests/Commands/UpgradeSpec.swift     | 11 ++-
 Tests/masTests/Commands/VendorSpec.swift      |  6 +-
 Tests/masTests/Commands/VersionSpec.swift     |  9 +-
 .../ITunesSearchAppStoreSearcherSpec.swift    | 71 +++++++++------
 .../Formatters/AppListFormatterSpec.swift     | 42 ++++-----
 .../SearchResultFormatterSpec.swift           | 84 ++++++++++--------
 .../Models/SearchResultListSpec.swift         | 16 +++-
 Tests/masTests/Models/SearchResultSpec.swift  | 10 ++-
 .../masTests/Models/SoftwareProductSpec.swift | 20 ++++-
 Tests/masTests/Utilities/Streams.swift        | 87 +++++++++++++++----
 24 files changed, 299 insertions(+), 232 deletions(-)

diff --git a/Tests/masTests/.swiftlint.yml b/Tests/masTests/.swiftlint.yml
index bc2a0087..53a7d0f5 100644
--- a/Tests/masTests/.swiftlint.yml
+++ b/Tests/masTests/.swiftlint.yml
@@ -9,4 +9,5 @@ disabled_rules:
   - force_cast
   - force_try
   - implicitly_unwrapped_optional
+  - large_tuple
   - no_magic_numbers
diff --git a/Tests/masTests/Commands/AccountSpec.swift b/Tests/masTests/Commands/AccountSpec.swift
index 2b12090b..c134facb 100644
--- a/Tests/masTests/Commands/AccountSpec.swift
+++ b/Tests/masTests/Commands/AccountSpec.swift
@@ -11,19 +11,15 @@ import Quick
 
 @testable import mas
 
-/// Deprecated test.
 public final class AccountSpec: QuickSpec {
     override public func spec() {
         beforeSuite {
             MAS.initialize()
         }
-        // account command disabled since macOS 12 Monterey https://github.com/mas-cli/mas#known-issues
-        describe("Account command") {
-            it("displays active account") {
-                expect {
-                    try MAS.Account.parse([]).run()
-                }
-                .to(throwError(MASError.notSupported))
+        describe("account command") {
+            it("displays not supported warning") {
+                expect(consequencesOf(try MAS.Account.parse([]).run()))
+                    == (error: MASError.notSupported, stdout: "", stderr: "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/HomeSpec.swift b/Tests/masTests/Commands/HomeSpec.swift
index 341cffb1..b25fe089 100644
--- a/Tests/masTests/Commands/HomeSpec.swift
+++ b/Tests/masTests/Commands/HomeSpec.swift
@@ -18,10 +18,8 @@ public final class HomeSpec: QuickSpec {
         }
         describe("home command") {
             it("can't find app with unknown ID") {
-                expect {
-                    try MAS.Home.parse(["999"]).run(searcher: MockAppStoreSearcher())
-                }
-                .to(throwError(MASError.unknownAppID(999)))
+                expect(consequencesOf(try MAS.Home.parse(["999"]).run(searcher: MockAppStoreSearcher())))
+                    == (MASError.unknownAppID(999), "", "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/InfoSpec.swift b/Tests/masTests/Commands/InfoSpec.swift
index 45f24050..27b82249 100644
--- a/Tests/masTests/Commands/InfoSpec.swift
+++ b/Tests/masTests/Commands/InfoSpec.swift
@@ -6,7 +6,6 @@
 //  Copyright © 2018 mas-cli. All rights reserved.
 //
 
-import Foundation
 import Nimble
 import Quick
 
@@ -19,10 +18,8 @@ public final class InfoSpec: QuickSpec {
         }
         describe("Info command") {
             it("can't find app with unknown ID") {
-                expect {
-                    try MAS.Info.parse(["999"]).run(searcher: MockAppStoreSearcher())
-                }
-                .to(throwError(MASError.unknownAppID(999)))
+                expect(consequencesOf(try MAS.Info.parse(["999"]).run(searcher: MockAppStoreSearcher())))
+                    == (MASError.unknownAppID(999), "", "")
             }
             it("displays app details") {
                 let mockResult = SearchResult(
@@ -36,21 +33,25 @@ public final class InfoSpec: QuickSpec {
                     trackViewUrl: "https://awesome.app",
                     version: "1.0"
                 )
-                expect {
-                    try captureStream(stdout) {
+                expect(
+                    consequencesOf(
                         try MAS.Info.parse([String(mockResult.trackId)])
                             .run(searcher: MockAppStoreSearcher([mockResult.trackId: mockResult]))
-                    }
-                }
-                    == """
-                    Awesome App 1.0 [$2.00]
-                    By: Awesome Dev
-                    Released: 2019-01-07
-                    Minimum OS: 10.14
-                    Size: 1 KB
-                    From: https://awesome.app
+                    )
+                )
+                    == (
+                        nil,
+                        """
+                        Awesome App 1.0 [$2.00]
+                        By: Awesome Dev
+                        Released: 2019-01-07
+                        Minimum OS: 10.14
+                        Size: 1 KB
+                        From: https://awesome.app
 
-                    """
+                        """,
+                        ""
+                    )
             }
         }
     }
diff --git a/Tests/masTests/Commands/InstallSpec.swift b/Tests/masTests/Commands/InstallSpec.swift
index 61d25078..d89e04ec 100644
--- a/Tests/masTests/Commands/InstallSpec.swift
+++ b/Tests/masTests/Commands/InstallSpec.swift
@@ -18,10 +18,12 @@ public final class InstallSpec: QuickSpec {
         }
         xdescribe("install command") {
             it("installs apps") {
-                expect {
-                    try MAS.Install.parse([]).run(appLibrary: MockAppLibrary(), searcher: MockAppStoreSearcher())
-                }
-                .toNot(throwError())
+                expect(
+                    consequencesOf(
+                        try MAS.Install.parse([]).run(appLibrary: MockAppLibrary(), searcher: MockAppStoreSearcher())
+                    )
+                )
+                    == (nil, "", "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/ListSpec.swift b/Tests/masTests/Commands/ListSpec.swift
index 5b5760a2..59b1204d 100644
--- a/Tests/masTests/Commands/ListSpec.swift
+++ b/Tests/masTests/Commands/ListSpec.swift
@@ -6,7 +6,6 @@
 //  Copyright © 2018 mas-cli. All rights reserved.
 //
 
-import Foundation
 import Nimble
 import Quick
 
@@ -19,12 +18,8 @@ public final class ListSpec: QuickSpec {
         }
         describe("list command") {
             it("lists apps") {
-                expect {
-                    try captureStream(stderr) {
-                        try MAS.List.parse([]).run(appLibrary: MockAppLibrary())
-                    }
-                }
-                    == "Error: No installed apps found\n"
+                expect(consequencesOf(try MAS.List.parse([]).run(appLibrary: MockAppLibrary())))
+                    == (nil, "", "Error: No installed apps found\n")
             }
         }
     }
diff --git a/Tests/masTests/Commands/LuckySpec.swift b/Tests/masTests/Commands/LuckySpec.swift
index 741efeb8..9fa79ed2 100644
--- a/Tests/masTests/Commands/LuckySpec.swift
+++ b/Tests/masTests/Commands/LuckySpec.swift
@@ -21,10 +21,10 @@ public final class LuckySpec: QuickSpec {
         }
         xdescribe("lucky command") {
             it("installs the first app matching a search") {
-                expect {
-                    try MAS.Lucky.parse(["Slack"]).run(appLibrary: MockAppLibrary(), searcher: searcher)
-                }
-                .toNot(throwError())
+                expect(
+                    consequencesOf(try MAS.Lucky.parse(["Slack"]).run(appLibrary: MockAppLibrary(), searcher: searcher))
+                )
+                    == (nil, "", "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/OpenSpec.swift b/Tests/masTests/Commands/OpenSpec.swift
index 74085314..bc8eadb0 100644
--- a/Tests/masTests/Commands/OpenSpec.swift
+++ b/Tests/masTests/Commands/OpenSpec.swift
@@ -6,7 +6,6 @@
 //  Copyright © 2019 mas-cli. All rights reserved.
 //
 
-import Foundation
 import Nimble
 import Quick
 
@@ -19,10 +18,8 @@ public final class OpenSpec: QuickSpec {
         }
         describe("open command") {
             it("can't find app with unknown ID") {
-                expect {
-                    try MAS.Open.parse(["999"]).run(searcher: MockAppStoreSearcher())
-                }
-                .to(throwError(MASError.unknownAppID(999)))
+                expect(consequencesOf(try MAS.Open.parse(["999"]).run(searcher: MockAppStoreSearcher())))
+                    == (MASError.unknownAppID(999), "", "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/OutdatedSpec.swift b/Tests/masTests/Commands/OutdatedSpec.swift
index f88bf544..5440a621 100644
--- a/Tests/masTests/Commands/OutdatedSpec.swift
+++ b/Tests/masTests/Commands/OutdatedSpec.swift
@@ -32,8 +32,8 @@ public final class OutdatedSpec: QuickSpec {
                         version: "1.28"
                     )
 
-                expect {
-                    try captureStream(stdout) {
+                expect(
+                    consequencesOf(
                         try MAS.Outdated.parse([])
                             .run(
                                 appLibrary: MockAppLibrary(
@@ -47,9 +47,9 @@ public final class OutdatedSpec: QuickSpec {
                                 ),
                                 searcher: MockAppStoreSearcher([mockSearchResult.trackId: mockSearchResult])
                             )
-                    }
-                }
-                    == "490461369 Bandwidth+ (1.27 -> 1.28)\n"
+                    )
+                )
+                    == (nil, "490461369 Bandwidth+ (1.27 -> 1.28)\n", "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/PurchaseSpec.swift b/Tests/masTests/Commands/PurchaseSpec.swift
index 6df46025..bafb7341 100644
--- a/Tests/masTests/Commands/PurchaseSpec.swift
+++ b/Tests/masTests/Commands/PurchaseSpec.swift
@@ -18,10 +18,13 @@ public final class PurchaseSpec: QuickSpec {
         }
         xdescribe("purchase command") {
             it("purchases apps") {
-                expect {
-                    try MAS.Purchase.parse(["999"]).run(appLibrary: MockAppLibrary(), searcher: MockAppStoreSearcher())
-                }
-                .toNot(throwError())
+                expect(
+                    consequencesOf(
+                        try MAS.Purchase.parse(["999"])
+                            .run(appLibrary: MockAppLibrary(), searcher: MockAppStoreSearcher())
+                    )
+                )
+                    == (nil, "", "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/SearchSpec.swift b/Tests/masTests/Commands/SearchSpec.swift
index 715ca1ab..260192a4 100644
--- a/Tests/masTests/Commands/SearchSpec.swift
+++ b/Tests/masTests/Commands/SearchSpec.swift
@@ -6,7 +6,6 @@
 //  Copyright © 2018 mas-cli. All rights reserved.
 //
 
-import Foundation
 import Nimble
 import Quick
 
@@ -25,19 +24,17 @@ public final class SearchSpec: QuickSpec {
                     trackViewUrl: "mas preview url",
                     version: "0.0"
                 )
-                expect {
-                    try captureStream(stdout) {
+                expect(
+                    consequencesOf(
                         try MAS.Search.parse(["slack"])
                             .run(searcher: MockAppStoreSearcher([mockResult.trackId: mockResult]))
-                    }
-                }
-                    == "        1111  slack  (0.0)\n"
+                    )
+                )
+                    == (nil, "        1111  slack  (0.0)\n", "")
             }
             it("fails when searching for nonexistent app") {
-                expect {
-                    try MAS.Search.parse(["nonexistent"]).run(searcher: MockAppStoreSearcher())
-                }
-                .to(throwError(MASError.noSearchResultsFound))
+                expect(consequencesOf(try MAS.Search.parse(["nonexistent"]).run(searcher: MockAppStoreSearcher())))
+                    == (MASError.noSearchResultsFound, "", "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/SignInSpec.swift b/Tests/masTests/Commands/SignInSpec.swift
index 22724562..174dc3ee 100644
--- a/Tests/masTests/Commands/SignInSpec.swift
+++ b/Tests/masTests/Commands/SignInSpec.swift
@@ -17,13 +17,10 @@ public final class SignInSpec: QuickSpec {
         beforeSuite {
             MAS.initialize()
         }
-        // signin command disabled since macOS 10.13 High Sierra: https://github.com/mas-cli/mas#known-issues
         describe("signin command") {
             it("signs in") {
-                expect {
-                    try MAS.SignIn.parse(["", ""]).run()
-                }
-                .to(throwError(MASError.notSupported))
+                expect(consequencesOf(try MAS.SignIn.parse(["", ""]).run()))
+                    == (MASError.notSupported, "", "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/SignOutSpec.swift b/Tests/masTests/Commands/SignOutSpec.swift
index bc7cfcdf..d390d55c 100644
--- a/Tests/masTests/Commands/SignOutSpec.swift
+++ b/Tests/masTests/Commands/SignOutSpec.swift
@@ -18,10 +18,8 @@ public final class SignOutSpec: QuickSpec {
         }
         describe("signout command") {
             it("signs out") {
-                expect {
-                    try MAS.SignOut.parse([]).run()
-                }
-                .toNot(throwError())
+                expect(consequencesOf(try MAS.SignOut.parse([]).run()))
+                    == (nil, "", "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/UninstallSpec.swift b/Tests/masTests/Commands/UninstallSpec.swift
index 212c7d83..635e022c 100644
--- a/Tests/masTests/Commands/UninstallSpec.swift
+++ b/Tests/masTests/Commands/UninstallSpec.swift
@@ -31,46 +31,30 @@ public final class UninstallSpec: QuickSpec {
                 let uninstall = try! MAS.Uninstall.parse(["--dry-run", String(appID)])
 
                 it("can't remove a missing app") {
-                    expect {
-                        try uninstall.run(appLibrary: MockAppLibrary())
-                    }
-                    .to(throwError(MASError.notInstalled(appID: appID)))
+                    expect(consequencesOf(try uninstall.run(appLibrary: MockAppLibrary())))
+                        == (MASError.notInstalled(appID: appID), "", "")
                 }
                 it("finds an app") {
-                    expect {
-                        try captureStream(stdout) {
-                            try uninstall.run(appLibrary: MockAppLibrary(app))
-                        }
-                    }
-                        == "==> 'Some App' '/tmp/Some.app'\n==> (not removed, dry run)\n"
+                    expect(consequencesOf(try uninstall.run(appLibrary: MockAppLibrary(app))))
+                        == (nil, "==> 'Some App' '/tmp/Some.app'\n==> (not removed, dry run)\n", "")
                 }
             }
             context("wet run") {
                 let uninstall = try! MAS.Uninstall.parse([String(appID)])
 
                 it("can't remove a missing app") {
-                    expect {
-                        try uninstall.run(appLibrary: MockAppLibrary())
-                    }
-                    .to(throwError(MASError.notInstalled(appID: appID)))
+                    expect(consequencesOf(try uninstall.run(appLibrary: MockAppLibrary())))
+                        == (MASError.notInstalled(appID: appID), "", "")
                 }
                 it("removes an app") {
-                    expect {
-                        try captureStream(stdout) {
-                            try uninstall.run(appLibrary: MockAppLibrary(app))
-                        }
-                    }
-                    .toNot(throwError())
+                    expect(consequencesOf(try uninstall.run(appLibrary: MockAppLibrary(app))))
+                        == (nil, "", "")
                 }
                 it("fails if there is a problem with the trash command") {
                     var brokenApp = app
                     brokenApp.bundlePath = "/dev/null"
-                    expect {
-                        try captureStream(stdout) {
-                            try uninstall.run(appLibrary: MockAppLibrary(brokenApp))
-                        }
-                    }
-                    .to(throwError(MASError.uninstallFailed(error: nil)))
+                    expect(consequencesOf(try uninstall.run(appLibrary: MockAppLibrary(brokenApp))))
+                        == (MASError.uninstallFailed(error: nil), "", "")
                 }
             }
         }
diff --git a/Tests/masTests/Commands/UpgradeSpec.swift b/Tests/masTests/Commands/UpgradeSpec.swift
index f1d4b844..7c99462e 100644
--- a/Tests/masTests/Commands/UpgradeSpec.swift
+++ b/Tests/masTests/Commands/UpgradeSpec.swift
@@ -6,7 +6,6 @@
 //  Copyright © 2018 mas-cli. All rights reserved.
 //
 
-import Foundation
 import Nimble
 import Quick
 
@@ -19,13 +18,13 @@ public final class UpgradeSpec: QuickSpec {
         }
         describe("upgrade command") {
             it("finds no upgrades") {
-                expect {
-                    try captureStream(stderr) {
+                expect(
+                    consequencesOf(
                         try MAS.Upgrade.parse([])
                             .run(appLibrary: MockAppLibrary(), searcher: MockAppStoreSearcher())
-                    }
-                }
-                .toNot(throwError())
+                    )
+                )
+                    == (nil, "", "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/VendorSpec.swift b/Tests/masTests/Commands/VendorSpec.swift
index ffade499..30b7c1a3 100644
--- a/Tests/masTests/Commands/VendorSpec.swift
+++ b/Tests/masTests/Commands/VendorSpec.swift
@@ -18,10 +18,8 @@ public final class VendorSpec: QuickSpec {
         }
         describe("vendor command") {
             it("can't find app with unknown ID") {
-                expect {
-                    try MAS.Vendor.parse(["999"]).run(searcher: MockAppStoreSearcher())
-                }
-                .to(throwError(MASError.unknownAppID(999)))
+                expect(consequencesOf(try MAS.Vendor.parse(["999"]).run(searcher: MockAppStoreSearcher())))
+                    == (MASError.unknownAppID(999), "", "")
             }
         }
     }
diff --git a/Tests/masTests/Commands/VersionSpec.swift b/Tests/masTests/Commands/VersionSpec.swift
index fe456ed1..cef8f22d 100644
--- a/Tests/masTests/Commands/VersionSpec.swift
+++ b/Tests/masTests/Commands/VersionSpec.swift
@@ -6,7 +6,6 @@
 //  Copyright © 2018 mas-cli. All rights reserved.
 //
 
-import Foundation
 import Nimble
 import Quick
 
@@ -19,12 +18,8 @@ public final class VersionSpec: QuickSpec {
         }
         describe("version command") {
             it("displays the current version") {
-                expect {
-                    try captureStream(stdout) {
-                        try MAS.Version.parse([]).run()
-                    }
-                }
-                    == "\(Package.version)\n"
+                expect(consequencesOf(try MAS.Version.parse([]).run()))
+                    == (nil, "\(Package.version)\n", "")
             }
         }
     }
diff --git a/Tests/masTests/Controllers/ITunesSearchAppStoreSearcherSpec.swift b/Tests/masTests/Controllers/ITunesSearchAppStoreSearcherSpec.swift
index 1537542c..f468eef9 100644
--- a/Tests/masTests/Controllers/ITunesSearchAppStoreSearcherSpec.swift
+++ b/Tests/masTests/Controllers/ITunesSearchAppStoreSearcherSpec.swift
@@ -18,26 +18,41 @@ public final class ITunesSearchAppStoreSearcherSpec: QuickSpec {
         }
         describe("url string") {
             it("contains the search term") {
-                expect {
-                    ITunesSearchAppStoreSearcher()
-                        .searchURL(
-                            for: "myapp",
-                            inRegion: findISORegion(forAlpha2Code: "US")
-                        )?
-                        .absoluteString
-                }
-                    == "https://itunes.apple.com/search?media=software&entity=desktopSoftware&country=US&term=myapp"
+                expect(
+                    consequencesOf(
+                        ITunesSearchAppStoreSearcher()
+                            .searchURL(
+                                for: "myapp",
+                                inRegion: findISORegion(forAlpha2Code: "US")
+                            )?
+                            .absoluteString
+                    )
+                )
+                    == (
+                        "https://itunes.apple.com/search?media=software&entity=desktopSoftware&country=US&term=myapp",
+                        nil,
+                        "",
+                        ""
+                    )
             }
             it("contains the encoded search term") {
-                expect {
-                    ITunesSearchAppStoreSearcher()
-                        .searchURL(
-                            for: "My App",
-                            inRegion: findISORegion(forAlpha2Code: "US")
-                        )?
-                        .absoluteString
-                }
-                    == "https://itunes.apple.com/search?media=software&entity=desktopSoftware&country=US&term=My%20App"
+                expect(
+                    consequencesOf(
+                        ITunesSearchAppStoreSearcher()
+                            .searchURL(
+                                for: "My App",
+                                inRegion: findISORegion(forAlpha2Code: "US")
+                            )?
+                            .absoluteString
+                    )
+                )
+                    == (
+                        // swiftlint:disable:next line_length
+                        "https://itunes.apple.com/search?media=software&entity=desktopSoftware&country=US&term=My%20App",
+                        nil,
+                        "",
+                        ""
+                    )
             }
         }
         describe("store") {
@@ -46,10 +61,11 @@ public final class ITunesSearchAppStoreSearcherSpec: QuickSpec {
                     let networkSession = MockFromFileNetworkSession(responseFile: "search/slack.json")
                     let searcher = ITunesSearchAppStoreSearcher(networkManager: NetworkManager(session: networkSession))
 
-                    expect {
-                        try searcher.search(for: "slack").wait()
-                    }
-                    .to(haveCount(39))
+                    let consequences = consequencesOf(try searcher.search(for: "slack").wait())
+                    expect(consequences.value).to(haveCount(39))
+                    expect(consequences.error) == nil
+                    expect(consequences.stdout).to(beEmpty())
+                    expect(consequences.stderr).to(beEmpty())
                 }
             }
 
@@ -59,13 +75,12 @@ public final class ITunesSearchAppStoreSearcherSpec: QuickSpec {
                     let networkSession = MockFromFileNetworkSession(responseFile: "lookup/slack.json")
                     let searcher = ITunesSearchAppStoreSearcher(networkManager: NetworkManager(session: networkSession))
 
-                    var result: SearchResult?
-                    expect {
-                        result = try searcher.lookup(appID: appID).wait()
-                    }
-                    .toNot(throwError())
+                    let consequences = consequencesOf(try searcher.lookup(appID: appID).wait())
+                    expect(consequences.error) == nil
+                    expect(consequences.stdout).to(beEmpty())
+                    expect(consequences.stderr).to(beEmpty())
 
-                    guard let result else {
+                    guard let result = consequences.value else {
                         fatalError("lookup result was nil")
                     }
 
diff --git a/Tests/masTests/Formatters/AppListFormatterSpec.swift b/Tests/masTests/Formatters/AppListFormatterSpec.swift
index d68a5878..30072ce7 100644
--- a/Tests/masTests/Formatters/AppListFormatterSpec.swift
+++ b/Tests/masTests/Formatters/AppListFormatterSpec.swift
@@ -21,7 +21,7 @@ public final class AppListFormatterSpec: QuickSpec {
         }
         describe("app list formatter") {
             it("formats nothing as empty string") {
-                expect(format([])).to(beEmpty())
+                expect(consequencesOf(format([]))) == ("", nil, "", "")
             }
             it("can format a single product") {
                 let product = MockSoftwareProduct(
@@ -31,30 +31,32 @@ public final class AppListFormatterSpec: QuickSpec {
                     bundleVersion: "19.2.1",
                     itemIdentifier: 12345
                 )
-                expect(format([product])) == "12345       Awesome App  (19.2.1)"
+                expect(consequencesOf(format([product]))) == ("12345       Awesome App  (19.2.1)", nil, "", "")
             }
             it("can format two products") {
                 expect(
-                    format(
-                        [
-                            MockSoftwareProduct(
-                                appName: "Awesome App",
-                                bundleIdentifier: "",
-                                bundlePath: "",
-                                bundleVersion: "19.2.1",
-                                itemIdentifier: 12345
-                            ),
-                            MockSoftwareProduct(
-                                appName: "Even Better App",
-                                bundleIdentifier: "",
-                                bundlePath: "",
-                                bundleVersion: "1.2.0",
-                                itemIdentifier: 67890
-                            ),
-                        ]
+                    consequencesOf(
+                        format(
+                            [
+                                MockSoftwareProduct(
+                                    appName: "Awesome App",
+                                    bundleIdentifier: "",
+                                    bundlePath: "",
+                                    bundleVersion: "19.2.1",
+                                    itemIdentifier: 12345
+                                ),
+                                MockSoftwareProduct(
+                                    appName: "Even Better App",
+                                    bundleIdentifier: "",
+                                    bundlePath: "",
+                                    bundleVersion: "1.2.0",
+                                    itemIdentifier: 67890
+                                ),
+                            ]
+                        )
                     )
                 )
-                    == "12345       Awesome App      (19.2.1)\n67890       Even Better App  (1.2.0)"
+                    == ("12345       Awesome App      (19.2.1)\n67890       Even Better App  (1.2.0)", nil, "", "")
             }
         }
     }
diff --git a/Tests/masTests/Formatters/SearchResultFormatterSpec.swift b/Tests/masTests/Formatters/SearchResultFormatterSpec.swift
index 15d13e8e..8e4856de 100644
--- a/Tests/masTests/Formatters/SearchResultFormatterSpec.swift
+++ b/Tests/masTests/Formatters/SearchResultFormatterSpec.swift
@@ -21,7 +21,7 @@ public final class SearchResultFormatterSpec: QuickSpec {
         }
         describe("search results formatter") {
             it("formats nothing as empty string") {
-                expect(format([], false)).to(beEmpty())
+                expect(consequencesOf(format([], false))) == ("", nil, "", "")
             }
             it("can format a single result") {
                 let result = SearchResult(
@@ -30,7 +30,7 @@ public final class SearchResultFormatterSpec: QuickSpec {
                     trackName: "Awesome App",
                     version: "19.2.1"
                 )
-                expect(format([result], false)) == "       12345  Awesome App  (19.2.1)"
+                expect(consequencesOf(format([result], false))) == ("       12345  Awesome App  (19.2.1)", nil, "", "")
             }
             it("can format a single result with price") {
                 let result = SearchResult(
@@ -39,51 +39,61 @@ public final class SearchResultFormatterSpec: QuickSpec {
                     trackName: "Awesome App",
                     version: "19.2.1"
                 )
-                expect(format([result], true)) == "       12345  Awesome App  (19.2.1)  $9.87"
+                expect(consequencesOf(format([result], true)))
+                    == ("       12345  Awesome App  (19.2.1)  $9.87", nil, "", "")
             }
             it("can format a two results") {
                 expect(
-                    format(
-                        [
-                            SearchResult(
-                                formattedPrice: "$9.87",
-                                trackId: 12345,
-                                trackName: "Awesome App",
-                                version: "19.2.1"
-                            ),
-                            SearchResult(
-                                formattedPrice: "$0.01",
-                                trackId: 67890,
-                                trackName: "Even Better App",
-                                version: "1.2.0"
-                            ),
-                        ],
-                        false
+                    consequencesOf(
+                        format(
+                            [
+                                SearchResult(
+                                    formattedPrice: "$9.87",
+                                    trackId: 12345,
+                                    trackName: "Awesome App",
+                                    version: "19.2.1"
+                                ),
+                                SearchResult(
+                                    formattedPrice: "$0.01",
+                                    trackId: 67890,
+                                    trackName: "Even Better App",
+                                    version: "1.2.0"
+                                ),
+                            ],
+                            false
+                        )
                     )
                 )
-                    == "       12345  Awesome App      (19.2.1)\n       67890  Even Better App  (1.2.0)"
+                    == ("       12345  Awesome App      (19.2.1)\n       67890  Even Better App  (1.2.0)", nil, "", "")
             }
             it("can format a two results with prices") {
                 expect(
-                    format(
-                        [
-                            SearchResult(
-                                formattedPrice: "$9.87",
-                                trackId: 12345,
-                                trackName: "Awesome App",
-                                version: "19.2.1"
-                            ),
-                            SearchResult(
-                                formattedPrice: "$0.01",
-                                trackId: 67890,
-                                trackName: "Even Better App",
-                                version: "1.2.0"
-                            ),
-                        ],
-                        true
+                    consequencesOf(
+                        format(
+                            [
+                                SearchResult(
+                                    formattedPrice: "$9.87",
+                                    trackId: 12345,
+                                    trackName: "Awesome App",
+                                    version: "19.2.1"
+                                ),
+                                SearchResult(
+                                    formattedPrice: "$0.01",
+                                    trackId: 67890,
+                                    trackName: "Even Better App",
+                                    version: "1.2.0"
+                                ),
+                            ],
+                            true
+                        )
                     )
                 )
-                    == "       12345  Awesome App      (19.2.1)  $9.87\n       67890  Even Better App  (1.2.0)  $0.01"
+                    == (
+                        "       12345  Awesome App      (19.2.1)  $9.87\n       67890  Even Better App  (1.2.0)  $0.01",
+                        nil,
+                        "",
+                        ""
+                    )
             }
         }
     }
diff --git a/Tests/masTests/Models/SearchResultListSpec.swift b/Tests/masTests/Models/SearchResultListSpec.swift
index ac6e3118..ec84c479 100644
--- a/Tests/masTests/Models/SearchResultListSpec.swift
+++ b/Tests/masTests/Models/SearchResultListSpec.swift
@@ -20,15 +20,23 @@ public final class SearchResultListSpec: QuickSpec {
         describe("search result list") {
             it("can parse bbedit") {
                 expect(
-                    try JSONDecoder().decode(SearchResultList.self, from: Data(from: "search/bbedit.json")).resultCount
+                    consequencesOf(
+                        try JSONDecoder()
+                            .decode(SearchResultList.self, from: Data(from: "search/bbedit.json"))
+                            .resultCount
+                    )
                 )
-                    == 1
+                    == (1, nil, "", "")
             }
             it("can parse things") {
                 expect(
-                    try JSONDecoder().decode(SearchResultList.self, from: Data(from: "search/things.json")).resultCount
+                    consequencesOf(
+                        try JSONDecoder()
+                            .decode(SearchResultList.self, from: Data(from: "search/things.json"))
+                            .resultCount
+                    )
                 )
-                    == 50
+                    == (50, nil, "", "")
             }
         }
     }
diff --git a/Tests/masTests/Models/SearchResultSpec.swift b/Tests/masTests/Models/SearchResultSpec.swift
index d800c748..3f1b6f97 100644
--- a/Tests/masTests/Models/SearchResultSpec.swift
+++ b/Tests/masTests/Models/SearchResultSpec.swift
@@ -20,11 +20,13 @@ public final class SearchResultSpec: QuickSpec {
         describe("search result") {
             it("can parse things") {
                 expect(
-                    try JSONDecoder()
-                        .decode(SearchResult.self, from: Data(from: "search/things-that-go-bump.json"))
-                        .trackId
+                    consequencesOf(
+                        try JSONDecoder()
+                            .decode(SearchResult.self, from: Data(from: "search/things-that-go-bump.json"))
+                            .trackId
+                    )
                 )
-                    == 1_472_954_003
+                    == (1_472_954_003, nil, "", "")
             }
         }
     }
diff --git a/Tests/masTests/Models/SoftwareProductSpec.swift b/Tests/masTests/Models/SoftwareProductSpec.swift
index 44cd4838..c8bf23dc 100644
--- a/Tests/masTests/Models/SoftwareProductSpec.swift
+++ b/Tests/masTests/Models/SoftwareProductSpec.swift
@@ -27,16 +27,28 @@ public final class SoftwareProductSpec: QuickSpec {
         }
         describe("software product") {
             it("is not outdated when there is no new version available") {
-                expect(app.isOutdated(comparedTo: SearchResult(version: "1.0.0"))) == false
+                expect(consequencesOf(app.isOutdated(comparedTo: SearchResult(version: "1.0.0"))))
+                    == (false, nil, "", "")
             }
             it("is outdated when there is a new version available") {
-                expect(app.isOutdated(comparedTo: SearchResult(version: "2.0.0"))) == true
+                expect(consequencesOf(app.isOutdated(comparedTo: SearchResult(version: "2.0.0"))))
+                    == (true, nil, "", "")
             }
             it("is not outdated when the new version of mac-software requires a higher OS version") {
-                expect(app.isOutdated(comparedTo: SearchResult(minimumOsVersion: "99.0.0", version: "3.0.0"))) == false
+                expect(
+                    consequencesOf(
+                        app.isOutdated(comparedTo: SearchResult(minimumOsVersion: "99.0.0", version: "3.0.0"))
+                    )
+                )
+                    == (false, nil, "", "")
             }
             it("is not outdated when the new version of software requires a higher OS version") {
-                expect(app.isOutdated(comparedTo: SearchResult(minimumOsVersion: "99.0.0", version: "3.0.0"))) == false
+                expect(
+                    consequencesOf(
+                        app.isOutdated(comparedTo: SearchResult(minimumOsVersion: "99.0.0", version: "3.0.0"))
+                    )
+                )
+                    == (false, nil, "", "")
             }
         }
     }
diff --git a/Tests/masTests/Utilities/Streams.swift b/Tests/masTests/Utilities/Streams.swift
index 14899f26..bcec47ba 100644
--- a/Tests/masTests/Utilities/Streams.swift
+++ b/Tests/masTests/Utilities/Streams.swift
@@ -8,29 +8,86 @@
 
 import Foundation
 
-func captureStream(
-    _ stream: UnsafeMutablePointer<FILE>,
-    encoding: String.Encoding = .utf8,
-    _ block: @escaping () throws -> Void
-) rethrows -> String {
-    let originalFd = fileno(stream)
-    let duplicateFd = dup(originalFd)
+@testable import mas
+
+func consequencesOf(
+    streamEncoding: String.Encoding = .utf8,
+    _ expression: @autoclosure @escaping () throws -> Void
+) -> (error: MASError?, stdout: String, stderr: String) {
+    let consequences = consequences(streamEncoding: streamEncoding, expression)
+    return (consequences.error, consequences.stdout, consequences.stderr)
+}
+
+func consequencesOf<T>(
+    streamEncoding: String.Encoding = .utf8,
+    _ expression: @autoclosure @escaping () throws -> T
+) -> (value: T?, error: MASError?, stdout: String, stderr: String) {
+    consequences(streamEncoding: streamEncoding, expression)
+}
+
+// periphery:ignore
+func consequencesOf(
+    streamEncoding: String.Encoding = .utf8,
+    _ body: @escaping () throws -> Void
+) -> (error: MASError?, stdout: String, stderr: String) {
+    let consequences = consequences(streamEncoding: streamEncoding, body)
+    return (consequences.error, consequences.stdout, consequences.stderr)
+}
+
+// periphery:ignore
+func consequencesOf<T>(
+    streamEncoding: String.Encoding = .utf8,
+    _ body: @escaping () throws -> T
+) -> (value: T?, error: MASError?, stdout: String, stderr: String) {
+    consequences(streamEncoding: streamEncoding, body)
+}
+
+private func consequences<T>(
+    streamEncoding: String.Encoding = .utf8,
+    _ body: @escaping () throws -> T
+) -> (value: T?, error: MASError?, stdout: String, stderr: String) {
+    let outOriginalFD = fileno(stdout)
+    let errOriginalFD = fileno(stderr)
+
+    let outDuplicateFD = dup(outOriginalFD)
     defer {
-        close(duplicateFd)
+        close(outDuplicateFD)
     }
 
-    let pipe = Pipe()
-    dup2(pipe.fileHandleForWriting.fileDescriptor, originalFd)
+    let errDuplicateFD = dup(errOriginalFD)
+    defer {
+        close(errDuplicateFD)
+    }
+
+    let outPipe = Pipe()
+    let errPipe = Pipe()
+
+    dup2(outPipe.fileHandleForWriting.fileDescriptor, outOriginalFD)
+    dup2(errPipe.fileHandleForWriting.fileDescriptor, errOriginalFD)
 
+    var value: T?
+    var thrownError: MASError?
     do {
         defer {
-            fflush(stream)
-            dup2(duplicateFd, originalFd)
-            pipe.fileHandleForWriting.closeFile()
+            fflush(stdout)
+            fflush(stderr)
+            dup2(outDuplicateFD, outOriginalFD)
+            dup2(errDuplicateFD, errOriginalFD)
+            outPipe.fileHandleForWriting.closeFile()
+            errPipe.fileHandleForWriting.closeFile()
         }
 
-        try block()
+        value = try body()
+    } catch let error as MASError {
+        thrownError = error
+    } catch {
+        thrownError = MASError.failed(error: error as NSError)
     }
 
-    return String(data: pipe.fileHandleForReading.readDataToEndOfFile(), encoding: encoding) ?? ""
+    return (
+        value,
+        thrownError,
+        String(data: outPipe.fileHandleForReading.readDataToEndOfFile(), encoding: streamEncoding) ?? "",
+        String(data: errPipe.fileHandleForReading.readDataToEndOfFile(), encoding: streamEncoding) ?? ""
+    )
 }

From ff4fce63971da709e69d2c786d99cff68dfe64e8 Mon Sep 17 00:00:00 2001
From: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
Date: Wed, 1 Jan 2025 19:44:07 -0500
Subject: [PATCH 9/9] Rename `Streams.swift` as `Consequences.swift`.

Resolve #596

Signed-off-by: Ross Goldberg <484615+rgoldberg@users.noreply.github.com>
---
 Tests/masTests/Utilities/{Streams.swift => Consequences.swift} | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 rename Tests/masTests/Utilities/{Streams.swift => Consequences.swift} (99%)

diff --git a/Tests/masTests/Utilities/Streams.swift b/Tests/masTests/Utilities/Consequences.swift
similarity index 99%
rename from Tests/masTests/Utilities/Streams.swift
rename to Tests/masTests/Utilities/Consequences.swift
index bcec47ba..4b3e012f 100644
--- a/Tests/masTests/Utilities/Streams.swift
+++ b/Tests/masTests/Utilities/Consequences.swift
@@ -1,5 +1,5 @@
 //
-//  Streams.swift
+//  Consequences.swift
 //  masTests
 //
 //  Created by Ross Goldberg on 2024-12-29.