Add AnimationTestView

Author: Kyle-Ye

Example/OpenSwiftUIUITests/Graphic/Color/ColorUITests.swift

@@ -60,7 +60,11 @@ struct ColorUITests {
 
     @Test
     func colorAnimation() {
-        struct ContentView: View {
+        struct ContentView: AnimationTestView {
+            nonisolated static var model: AnimationTestModel {
+                AnimationTestModel(duration: 1, count: 10)
+            }
+
             @State private var showRed = false
             var body: some View {
                 VStack {
@@ -73,10 +77,9 @@ struct ColorUITests {
                 }
             }
         }
-        let model = AnimationTestModel(duration: 1, count: 10)
         openSwiftUIAssertAnimationSnapshot(
-            of: ContentView(),
-            model: model,
+            of: ContentView()
+//            precision: 0.8 // TODO: Maybe related with issue #340
         )
     }
 }

Example/OpenSwiftUIUITests/UITests/AnimationDebugController.swift

@@ -20,6 +20,10 @@ struct AnimationTestModel: Hashable {
     }
 }
 
+protocol AnimationTestView: View {
+    static var model: AnimationTestModel { get }
+}
+
 final class AnimationDebugController<V>: UIHostingController<V> where V: View {
     init(_ view: V) {
         super.init(rootView: view)

Example/OpenSwiftUIUITests/UITests/SnapshotTesting+Testing.swift

@@ -158,9 +158,9 @@ private func openSwiftUIAssertSnapshot<Value, Format>(
 
 // MARK: - Animation
 
-func openSwiftUIAssertAnimationSnapshot<V: View>(
+func openSwiftUIAssertAnimationSnapshot<V: AnimationTestView>(
     of value: @autoclosure () -> V,
-    model: AnimationTestModel,
+    precision: Float = 1,
     perceptualPrecision: Float = 1,
     size: CGSize = defaultSize,
     record recording: Bool? = shouldRecord,
@@ -174,11 +174,12 @@ func openSwiftUIAssertAnimationSnapshot<V: View>(
     let vc = AnimationDebugController(value())
     // Flush the neccessary onAppear etc. stuff
     vc.advance(interval: .zero)
+    let model = V.model
     model.intervals.enumerated().forEach { (index, interval) in
         vc.advance(interval: interval)
         openSwiftUIAssertSnapshot(
             of: vc,
-            as: .image(perceptualPrecision: perceptualPrecision, size: size),
+            as: .image(precision: precision, perceptualPrecision: perceptualPrecision, size: size),
             named: "\(index + 1)_\(model.intervals.count).\(Int(size.width))x\(Int(size.height))",
             record: recording,
             timeout: timeout,