Android support (#939)

* Android support

* Android support

* CI updates

* Run swift-format

* CI updates

* CI updates

* Run swift-format

* CI updates

* CI updates

* CI updates

* Run swift-format

* CI updates

* CI updates

* Run swift-format

* CI fixes

* Run swift-format

* CI fixes

* Run swift-format

* CI fixes

* Update AssertSnapshot.swift

---------

Co-authored-by: marcprux <marcprux@users.noreply.github.com>
Co-authored-by: Stephen Celis <stephen@stephencelis.com>
Co-authored-by: Stephen Celis <stephen.celis@gmail.com>

Author: marcprux

.github/workflows/ci.yml

@@ -63,3 +63,17 @@ jobs:
       - uses: actions/checkout@v4
       - run: swift build
       - run: swift test
+
+  android:
+    strategy:
+      matrix:
+        swift:
+          - "6.0.2"
+    name: Android
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: skiptools/swift-android-action@v2
+        with:
+          swift-version: ${{ matrix.swift }}
+          copy-files: ${GITHUB_WORKSPACE}/Tests/SnapshotTestingTests/__Snapshots__

Sources/SnapshotTesting/AssertSnapshot.swift

@@ -296,12 +296,17 @@ public func verifySnapshot<Value, Format>(
       let fileUrl = URL(fileURLWithPath: "\(filePath)", isDirectory: false)
       let fileName = fileUrl.deletingPathExtension().lastPathComponent
 
+      #if os(Android)
+        // When running tests on Android, the CI script copies the Tests/SnapshotTestingTests/__Snapshots__ up to the temporary folder
+        let snapshotsBaseUrl = URL(
+          fileURLWithPath: "/data/local/tmp/android-xctest", isDirectory: true)
+      #else
+        let snapshotsBaseUrl = fileUrl.deletingLastPathComponent()
+      #endif
+
       let snapshotDirectoryUrl =
         snapshotDirectory.map { URL(fileURLWithPath: $0, isDirectory: true) }
-        ?? fileUrl
-        .deletingLastPathComponent()
-        .appendingPathComponent("__Snapshots__")
-        .appendingPathComponent(fileName)
+        ?? snapshotsBaseUrl.appendingPathComponent("__Snapshots__").appendingPathComponent(fileName)
 
       let identifier: String
       if let name = name {
@@ -316,10 +321,12 @@ public func verifySnapshot<Value, Format>(
       }
 
       let testName = sanitizePathComponent(testName)
-      let snapshotFileUrl =
+      var snapshotFileUrl =
         snapshotDirectoryUrl
         .appendingPathComponent("\(testName).\(identifier)")
-        .appendingPathExtension(snapshotting.pathExtension ?? "")
+      if let ext = snapshotting.pathExtension {
+        snapshotFileUrl = snapshotFileUrl.appendingPathExtension(ext)
+      }
       let fileManager = FileManager.default
       try fileManager.createDirectory(at: snapshotDirectoryUrl, withIntermediateDirectories: true)
 
@@ -359,7 +366,7 @@ public func verifySnapshot<Value, Format>(
           try snapshotData.write(to: snapshotFileUrl)
         }
 
-        #if !os(Linux) && !os(Windows)
+        #if !os(Android) && !os(Linux) && !os(Windows)
           if !isSwiftTesting,
             ProcessInfo.processInfo.environment.keys.contains("__XCODE_BUILT_PRODUCTS_DIR_PATHS")
           {
@@ -446,7 +453,7 @@ public func verifySnapshot<Value, Format>(
       try snapshotting.diffing.toData(diffable).write(to: failedSnapshotFileUrl)
 
       if !attachments.isEmpty {
-        #if !os(Linux) && !os(Windows)
+        #if !os(Linux) && !os(Android) && !os(Windows)
           if ProcessInfo.processInfo.environment.keys.contains("__XCODE_BUILT_PRODUCTS_DIR_PATHS"),
             !isSwiftTesting
           {
@@ -501,7 +508,7 @@ func sanitizePathComponent(_ string: String) -> String {
     .replacingOccurrences(of: "^-|-$", with: "", options: .regularExpression)
 }
 
-#if !os(Linux) && !os(Windows)
+#if !os(Android) && !os(Linux) && !os(Windows)
   import CoreServices
 
   func uniformTypeIdentifier(fromExtension pathExtension: String) -> String? {

Sources/SnapshotTesting/Common/XCTAttachment.swift

@@ -1,4 +1,4 @@
-#if os(Linux) || os(Windows)
+#if os(Linux) || os(Android) || os(Windows)
   import Foundation
 
   public struct XCTAttachment {

Sources/SnapshotTesting/Internal/Deprecations.swift

@@ -136,7 +136,7 @@ public func _verifyInlineSnapshot<Value>(
 
     /// Did not successfully record, so we will fail.
     if !attachments.isEmpty {
-      #if !os(Linux) && !os(Windows)
+      #if !os(Linux) && !os(Android) && !os(Windows)
         if ProcessInfo.processInfo.environment.keys.contains("__XCODE_BUILT_PRODUCTS_DIR_PATHS") {
           XCTContext.runActivity(named: "Attached Failure Diff") { activity in
             attachments.forEach {

Tests/SnapshotTestingTests/RecordTests.swift

@@ -162,6 +162,9 @@ class RecordTests: XCTestCase {
   #endif
 
   func testRecordFailed_NoFailure() throws {
+    #if os(Android)
+      throw XCTSkip("cannot save next to file on Android")
+    #endif
     try Data("42".utf8).write(to: snapshotURL)
     let modifiedDate =
       try FileManager.default