Implement a simple CI and move tests to iOS

Author: jcavar

.github/workflows/tests.yml

@@ -0,0 +1,32 @@
+name: Run Tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: macos-26
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    
+    - name: List available simulators
+      run: xcrun simctl list devices available
+    
+    - name: Run tests
+      run: |
+        xcodebuild test \
+          -scheme AudioSnapshotTesting \
+          -destination 'platform=iOS Simulator,name=iPad Pro 13-inch (M5),OS=latest' \
+          -resultBundlePath TestResults.xcresult
+      continue-on-error: true
+
+    - name: Upload test results
+      if: always()
+      uses: actions/upload-artifact@v4
+      with:
+        name: test-results
+        path: TestResults.xcresult
+        retention-days: 30

Sources/AudioSnapshotTesting/SpectrogramView.swift

@@ -31,7 +31,11 @@ struct SpectrogramView: View {
         self.imageWidth = width
         let cgImage = CGImage.spectrogramImage(data: data, width: width, height: height)
         let platformImage = PlatformImage.withRotated(cgImage: cgImage)
+        #if os(macOS)
         image = Image(nsImage: platformImage)
+        #else
+        image = Image(uiImage: platformImage)
+        #endif
     }
 
     var body: some View {