Utilize multiline string literals

Sources/Nimble/Adapters/NimbleXCTestHandler.swift

@@ -69,8 +69,11 @@ private func recordFailure(_ message: String, location: SourceLocation) {
         let line = Int(location.line)
         testCase.recordFailure(withDescription: message, inFile: location.file, atLine: line, expected: true)
     } else {
-        let msg = "Attempted to report a test failure to XCTest while no test case was running. " +
-        "The failure was:\n\"\(message)\"\nIt occurred at: \(location.file):\(location.line)"
+        let msg = """
+            Attempted to report a test failure to XCTest while no test case was running. The failure was:
+            \"\(message)\"
+            It occurred at: \(location.file):\(location.line)
+            """
         NSException(name: .internalInconsistencyException, reason: msg, userInfo: nil).raise()
     }
 #endif

Sources/Nimble/DSL.swift

@@ -56,9 +56,12 @@ internal func nimblePrecondition(
 }
 
 internal func internalError(_ msg: String, file: FileString = #file, line: UInt = #line) -> Never {
+    // swiftlint:disable line_length
     fatalError(
-        "Nimble Bug Found: \(msg) at \(file):\(line).\n" +
-        "Please file a bug to Nimble: https://github.com/Quick/Nimble/issues with the " +
-        "code snippet that caused this error."
+        """
+        Nimble Bug Found: \(msg) at \(file):\(line).
+        Please file a bug to Nimble: https://github.com/Quick/Nimble/issues with the code snippet that caused this error.
+        """
     )
+    // swiftlint:enable line_length
 }

Sources/Nimble/Matchers/AsyncMatcherWrapper.swift

@@ -111,8 +111,10 @@ internal struct AsyncMatcherWrapper<T, U>: Matcher
 }
 
 private let toEventuallyRequiresClosureError = FailureMessage(
-    // swiftlint:disable:next line_length
-    stringValue: "expect(...).toEventually(...) requires an explicit closure (eg - expect { ... }.toEventually(...) )\nSwift 1.2 @autoclosure behavior has changed in an incompatible way for Nimble to function"
+    stringValue: """
+        expect(...).toEventually(...) requires an explicit closure (eg - expect { ... }.toEventually(...) )
+        Swift 1.2 @autoclosure behavior has changed in an incompatible way for Nimble to function
+        """
 )
 
 extension Expectation {

Sources/Nimble/Utils/Async.swift

@@ -45,10 +45,15 @@ internal class AssertionWaitLock: WaitLock {
         nimblePrecondition(
             currentWaiter == nil,
             "InvalidNimbleAPIUsage",
-            "Nested async expectations are not allowed to avoid creating flaky tests.\n\n" +
-            "The call to\n\t\(info)\n" +
-            "triggered this exception because\n\t\(currentWaiter!)\n" +
-            "is currently managing the main run loop."
+            """
+            Nested async expectations are not allowed to avoid creating flaky tests.
+
+            The call to
+            \t\(info)
+            triggered this exception because
+            \t\(currentWaiter!)
+            is currently managing the main run loop.
+            """
         )
         currentWaiter = info
     }

Tests/NimbleTests/AsynchronousTest.swift

@@ -130,15 +130,16 @@ final class AsyncTest: XCTestCase, XCTestCaseProvider {
     func testCombiningAsyncWaitUntilAndToEventuallyIsNotAllowed() {
         // Currently we are unable to catch Objective-C exceptions when built by the Swift Package Manager
 #if !SWIFT_PACKAGE
-        let referenceLine = #line + 9
-        var msg = "Unexpected exception raised: Nested async expectations are not allowed "
-        msg += "to avoid creating flaky tests."
-        msg += "\n\n"
-        msg += "The call to\n\t"
-        msg += "expect(...).toEventually(...) at \(#file):\(referenceLine + 7)\n"
-        msg += "triggered this exception because\n\t"
-        msg += "waitUntil(...) at \(#file):\(referenceLine + 1)\n"
-        msg += "is currently managing the main run loop."
+        let referenceLine = #line + 10
+        let msg = """
+            Unexpected exception raised: Nested async expectations are not allowed to avoid creating flaky tests.
+
+            The call to
+            \texpect(...).toEventually(...) at \(#file):\(referenceLine + 7)
+            triggered this exception because
+            \twaitUntil(...) at \(#file):\(referenceLine + 1)
+            is currently managing the main run loop.
+            """
         failsWithErrorMessage(msg) { // reference line
             waitUntil(timeout: 2.0) { done in
                 var protected: Int = 0

Tests/NimbleTests/Helpers/utils.swift

@@ -37,7 +37,12 @@ func failsWithErrorMessage(_ messages: [String], file: FileString = #file, line:
         } else {
             let knownFailures = recorder.assertions.filter { !$0.success }.map { $0.message.stringValue }
             let knownFailuresJoined = knownFailures.joined(separator: ", ")
-            message = "Expected error message (\(msg)), got (\(knownFailuresJoined))\n\nAssertions Received:\n\(recorder.assertions)"
+            message = """
+                Expected error message (\(msg)), got (\(knownFailuresJoined))
+
+                Assertions Received:
+                \(recorder.assertions)
+                """
         }
         NimbleAssertionHandler.assert(false,
                                       message: FailureMessage(stringValue: message),

Tests/NimbleTests/Matchers/HaveCountTest.swift

@@ -6,11 +6,21 @@ final class HaveCountTest: XCTestCase, XCTestCaseProvider {
         expect([1, 2, 3]).to(haveCount(3))
         expect([1, 2, 3]).notTo(haveCount(1))
 
-        failsWithErrorMessage("expected to have Array<Int> with count 1, got 3\nActual Value: [1, 2, 3]") {
+        failsWithErrorMessage(
+            """
+            expected to have Array<Int> with count 1, got 3
+            Actual Value: [1, 2, 3]
+            """
+        ) {
             expect([1, 2, 3]).to(haveCount(1))
         }
 
-        failsWithErrorMessage("expected to not have Array<Int> with count 3, got 3\nActual Value: [1, 2, 3]") {
+        failsWithErrorMessage(
+            """
+            expected to not have Array<Int> with count 3, got 3
+            Actual Value: [1, 2, 3]
+            """
+        ) {
             expect([1, 2, 3]).notTo(haveCount(3))
         }
     }
@@ -20,13 +30,22 @@ final class HaveCountTest: XCTestCase, XCTestCaseProvider {
         expect(dictionary).to(haveCount(3))
         expect(dictionary).notTo(haveCount(1))
 
-        failsWithErrorMessage("expected to have Dictionary<String, Int> with count 1, got 3\nActual Value: \(stringify(dictionary))") {
+        failsWithErrorMessage(
+            """
+            expected to have Dictionary<String, Int> with count 1, got 3
+            Actual Value: \(stringify(dictionary))
+            """
+        ) {
             expect(dictionary).to(haveCount(1))
         }
 
-        failsWithErrorMessage("expected to not have Dictionary<String, Int> with count 3, got 3" +
-            "\nActual Value: \(stringify(dictionary))") {
-                expect(dictionary).notTo(haveCount(3))
+        failsWithErrorMessage(
+            """
+            expected to not have Dictionary<String, Int> with count 3, got 3
+            Actual Value: \(stringify(dictionary))
+            """
+        ) {
+            expect(dictionary).notTo(haveCount(3))
         }
     }
 
@@ -35,14 +54,22 @@ final class HaveCountTest: XCTestCase, XCTestCaseProvider {
         expect(set).to(haveCount(3))
         expect(set).notTo(haveCount(1))
 
-        failsWithErrorMessage("expected to have Set<Int> with count 1, got 3" +
-            "\nActual Value: \(stringify(set))") {
-                expect(set).to(haveCount(1))
+        failsWithErrorMessage(
+            """
+            expected to have Set<Int> with count 1, got 3
+            Actual Value: \(stringify(set))
+            """
+        ) {
+            expect(set).to(haveCount(1))
         }
 
-        failsWithErrorMessage("expected to not have Set<Int> with count 3, got 3" +
-            "\nActual Value: \(stringify(set))") {
-                expect(set).notTo(haveCount(3))
+        failsWithErrorMessage(
+            """
+            expected to not have Set<Int> with count 3, got 3
+            Actual Value: \(stringify(set))
+            """
+        ) {
+            expect(set).notTo(haveCount(3))
         }
     }
 }

Tests/NimbleTests/UserDescriptionTest.swift

@@ -4,49 +4,67 @@ import Nimble
 final class UserDescriptionTest: XCTestCase, XCTestCaseProvider {
     func testToMatcher_CustomFailureMessage() {
         failsWithErrorMessage(
-            "These aren't equal!\n" +
-            "expected to match, got <1>") {
-                expect(1).to(MatcherFunc { _, _ in false }, description: "These aren't equal!")
+            """
+            These aren't equal!
+            expected to match, got <1>
+            """
+        ) {
+            expect(1).to(MatcherFunc { _, _ in false }, description: "These aren't equal!")
         }
     }
 
     func testNotToMatcher_CustomFailureMessage() {
         failsWithErrorMessage(
-            "These aren't equal!\n" +
-            "expected to not match, got <1>") {
-                expect(1).notTo(MatcherFunc { _, _ in true }, description: "These aren't equal!")
+            """
+            These aren't equal!
+            expected to not match, got <1>
+            """
+        ) {
+            expect(1).notTo(MatcherFunc { _, _ in true }, description: "These aren't equal!")
         }
     }
 
     func testToNotMatcher_CustomFailureMessage() {
         failsWithErrorMessage(
-            "These aren't equal!\n" +
-            "expected to not match, got <1>") {
-                expect(1).toNot(MatcherFunc { _, _ in true }, description: "These aren't equal!")
+            """
+            These aren't equal!
+            expected to not match, got <1>
+            """
+        ) {
+            expect(1).toNot(MatcherFunc { _, _ in true }, description: "These aren't equal!")
         }
     }
 
     func testToEventuallyMatch_CustomFailureMessage() {
         failsWithErrorMessage(
-            "These aren't eventually equal!\n" +
-            "expected to eventually equal <1>, got <0>") {
-                expect { 0 }.toEventually(equal(1), description: "These aren't eventually equal!")
+            """
+            These aren't eventually equal!
+            expected to eventually equal <1>, got <0>
+            """
+        ) {
+            expect { 0 }.toEventually(equal(1), description: "These aren't eventually equal!")
         }
     }
 
     func testToEventuallyNotMatch_CustomFailureMessage() {
         failsWithErrorMessage(
-            "These are eventually equal!\n" +
-            "expected to eventually not equal <1>, got <1>") {
-                expect { 1 }.toEventuallyNot(equal(1), description: "These are eventually equal!")
+            """
+            These are eventually equal!
+            expected to eventually not equal <1>, got <1>
+            """
+        ) {
+            expect { 1 }.toEventuallyNot(equal(1), description: "These are eventually equal!")
         }
     }
 
     func testToNotEventuallyMatch_CustomFailureMessage() {
         failsWithErrorMessage(
-            "These are eventually equal!\n" +
-            "expected to eventually not equal <1>, got <1>") {
-                expect { 1 }.toEventuallyNot(equal(1), description: "These are eventually equal!")
+            """
+            These are eventually equal!
+            expected to eventually not equal <1>, got <1>
+            """
+        ) {
+            expect { 1 }.toEventuallyNot(equal(1), description: "These are eventually equal!")
         }
     }