add more animation tests

 import 'dart:math';
 import 'dart:math';
+import 'dart:ui';
 
 
 import 'package:flutter/widgets.dart';
 import 'package:flutter/widgets.dart';
 
 
 import 'get_animated_builder.dart';
 import 'get_animated_builder.dart';
 
 
+typedef OffsetBuilder = Offset Function(BuildContext, double);
+
 class FadeInAnimation extends OpacityAnimation {
 class FadeInAnimation extends OpacityAnimation {
   FadeInAnimation({
   FadeInAnimation({
     super.key,
     super.key,
@@ -89,47 +92,83 @@ class ScaleAnimation extends GetAnimatedBuilder<double> {
         );
         );
 }
 }
 
 
-class SlideAnimation extends GetAnimatedBuilder<Offset> {
-  SlideAnimation({
+// class SlideAnimation extends GetAnimatedBuilder<Offset> {
+//   SlideAnimation({
+//     super.key,
+//     required super.duration,
+//     required super.delay,
+//     required super.child,
+//     super.onComplete,
+//     required Offset begin,
+//     required Offset end,
+//     super.idleValue = const Offset(0, 0),
+//   }) : super(
+//           builder: (context, value, child) => Transform.translate(
+//             offset: value,
+//             child: child,
+//           ),
+//           tween: Tween(begin: begin, end: end),
+//         );
+// }
+
+class BounceAnimation extends GetAnimatedBuilder<double> {
+  BounceAnimation({
     super.key,
     super.key,
     required super.duration,
     required super.duration,
     required super.delay,
     required super.delay,
     required super.child,
     required super.child,
     super.onComplete,
     super.onComplete,
-    required Offset begin,
-    required Offset end,
-    super.idleValue = const Offset(0, 0),
+    super.curve = Curves.bounceOut,
+    required double begin,
+    required double end,
+    super.idleValue = 0,
   }) : super(
   }) : super(
-          builder: (context, value, child) => Transform.translate(
-            offset: value,
+          builder: (context, value, child) => Transform.scale(
+            scale: 1 + value.abs(),
             child: child,
             child: child,
           ),
           ),
-          tween: Tween(begin: begin, end: end),
+          tween: Tween<double>(begin: begin, end: end),
         );
         );
 }
 }
 
 
-class BounceAnimation extends GetAnimatedBuilder<double> {
-  BounceAnimation({
+class SpinAnimation extends GetAnimatedBuilder<double> {
+  SpinAnimation({
     super.key,
     super.key,
     required super.duration,
     required super.duration,
     required super.delay,
     required super.delay,
     required super.child,
     required super.child,
     super.onComplete,
     super.onComplete,
-    super.curve = Curves.bounceOut,
+    super.idleValue = 0,
+  }) : super(
+          builder: (context, value, child) => Transform.rotate(
+            angle: value * pi / 180.0,
+            child: child,
+          ),
+          tween: Tween<double>(begin: 0, end: 360),
+        );
+}
+
+class SizeAnimation extends GetAnimatedBuilder<double> {
+  SizeAnimation({
+    super.key,
+    required super.duration,
+    required super.delay,
+    required super.child,
+    super.onComplete,
+    super.idleValue = 0,
     required double begin,
     required double begin,
     required double end,
     required double end,
-    super.idleValue = 0,
   }) : super(
   }) : super(
           builder: (context, value, child) => Transform.scale(
           builder: (context, value, child) => Transform.scale(
-            scale: 1 + value.abs(),
+            scale: value,
             child: child,
             child: child,
           ),
           ),
           tween: Tween<double>(begin: begin, end: end),
           tween: Tween<double>(begin: begin, end: end),
         );
         );
 }
 }
 
 
-class ShakeAnimation extends GetAnimatedBuilder<double> {
-  ShakeAnimation({
+class BlurAnimation extends GetAnimatedBuilder<double> {
+  BlurAnimation({
     super.key,
     super.key,
     required super.duration,
     required super.duration,
     required super.delay,
     required super.delay,
@@ -139,69 +178,207 @@ class ShakeAnimation extends GetAnimatedBuilder<double> {
     required double end,
     required double end,
     super.idleValue = 0,
     super.idleValue = 0,
   }) : super(
   }) : super(
-          builder: (context, value, child) => Transform.rotate(
-            angle: value * pi / 180.0,
+          builder: (context, value, child) => BackdropFilter(
+            filter: ImageFilter.blur(
+              sigmaX: value,
+              sigmaY: value,
+            ),
             child: child,
             child: child,
           ),
           ),
           tween: Tween<double>(begin: begin, end: end),
           tween: Tween<double>(begin: begin, end: end),
         );
         );
 }
 }
 
 
-class SpinAnimation extends GetAnimatedBuilder<double> {
-  SpinAnimation({
+class FlipAnimation extends GetAnimatedBuilder<double> {
+  FlipAnimation({
     super.key,
     super.key,
     required super.duration,
     required super.duration,
     required super.delay,
     required super.delay,
     required super.child,
     required super.child,
     super.onComplete,
     super.onComplete,
+    required double begin,
+    required double end,
     super.idleValue = 0,
     super.idleValue = 0,
   }) : super(
   }) : super(
-          builder: (context, value, child) => Transform.rotate(
-            angle: value * pi / 180.0,
+          builder: (context, value, child) {
+            final radians = value * pi;
+            return Transform(
+              transform: Matrix4.rotationY(radians),
+              alignment: Alignment.center,
               child: child,
               child: child,
-          ),
-          tween: Tween<double>(begin: 0, end: 360),
+            );
+          },
+          tween: Tween<double>(begin: begin, end: end),
         );
         );
 }
 }
 
 
-class ColorAnimation extends GetAnimatedBuilder<Color?> {
-  ColorAnimation({
+class WaveAnimation extends GetAnimatedBuilder<double> {
+  WaveAnimation({
     super.key,
     super.key,
     required super.duration,
     required super.duration,
     required super.delay,
     required super.delay,
     required super.child,
     required super.child,
     super.onComplete,
     super.onComplete,
-    required Color begin,
-    required Color end,
-    Color? idleColor,
+    required double begin,
+    required double end,
+    super.idleValue = 0,
   }) : super(
   }) : super(
-          builder: (context, value, child) => ColorFiltered(
-            colorFilter: ColorFilter.mode(
-              Color.lerp(begin, end, value!.value.toDouble())!,
-              BlendMode.srcIn,
+          builder: (context, value, child) => Transform(
+            transform: Matrix4.translationValues(
+              0.0,
+              20.0 * sin(value * pi * 2),
+              0.0,
             ),
             ),
             child: child,
             child: child,
           ),
           ),
-          idleValue: idleColor ?? begin,
-          tween: ColorTween(begin: begin, end: end),
+          tween: Tween<double>(begin: begin, end: end),
         );
         );
 }
 }
 
 
-class SizeAnimation extends GetAnimatedBuilder<double> {
-  SizeAnimation({
+class WobbleAnimation extends GetAnimatedBuilder<double> {
+  WobbleAnimation({
+    super.key,
+    required super.duration,
+    required super.delay,
+    required super.child,
+    super.onComplete,
+    required double begin,
+    required double end,
+    super.idleValue = 0,
+  }) : super(
+          builder: (context, value, child) => Transform(
+            transform: Matrix4.identity()
+              ..setEntry(3, 2, 0.001)
+              ..rotateZ(sin(value * pi * 2) * 0.1),
+            alignment: Alignment.center,
+            child: child,
+          ),
+          tween: Tween<double>(begin: begin, end: end),
+        );
+}
+
+class SlideInLeftAnimation extends SlideAnimation {
+  SlideInLeftAnimation({
+    super.key,
+    required super.duration,
+    required super.delay,
+    required super.child,
+    super.onComplete,
+    required super.begin,
+    required super.end,
+    super.idleValue = 0,
+  }) : super(
+          offsetBuild: (context, value) =>
+              Offset(value * MediaQuery.of(context).size.width, 0),
+        );
+}
+
+class SlideInRightAnimation extends SlideAnimation {
+  SlideInRightAnimation({
+    super.key,
+    required super.duration,
+    required super.delay,
+    required super.child,
+    super.onComplete,
+    required super.begin,
+    required super.end,
+    super.idleValue = 0,
+  }) : super(
+          offsetBuild: (context, value) =>
+              Offset((1 - value) * MediaQuery.of(context).size.width, 0),
+        );
+}
+
+class SlideInUpAnimation extends SlideAnimation {
+  SlideInUpAnimation({
+    super.key,
+    required super.duration,
+    required super.delay,
+    required super.child,
+    super.onComplete,
+    required super.begin,
+    required super.end,
+    super.idleValue = 0,
+  }) : super(
+          offsetBuild: (context, value) =>
+              Offset(0, value * MediaQuery.of(context).size.height),
+        );
+}
+
+class SlideInDownAnimation extends SlideAnimation {
+  SlideInDownAnimation({
     super.key,
     super.key,
     required super.duration,
     required super.duration,
     required super.delay,
     required super.delay,
     required super.child,
     required super.child,
     super.onComplete,
     super.onComplete,
+    required super.begin,
+    required super.end,
     super.idleValue = 0,
     super.idleValue = 0,
+  }) : super(
+          offsetBuild: (context, value) =>
+              Offset(0, (1 - value) * MediaQuery.of(context).size.height),
+        );
+}
+
+class SlideAnimation extends GetAnimatedBuilder<double> {
+  SlideAnimation({
+    super.key,
+    required super.duration,
+    required super.delay,
+    required super.child,
     required double begin,
     required double begin,
     required double end,
     required double end,
+    required OffsetBuilder offsetBuild,
+    super.onComplete,
+    super.idleValue = 0,
   }) : super(
   }) : super(
-          builder: (context, value, child) => Transform.scale(
-            scale: value,
+          builder: (context, value, child) => Transform.translate(
+            offset: offsetBuild(context, value),
             child: child,
             child: child,
           ),
           ),
           tween: Tween<double>(begin: begin, end: end),
           tween: Tween<double>(begin: begin, end: end),
         );
         );
 }
 }
+
+// class ZoomAnimation extends GetAnimatedBuilder<double> {
+//   ZoomAnimation({
+//     super.key,
+//     required super.duration,
+//     required super.delay,
+//     required super.child,
+//     super.onComplete,
+//     required double begin,
+//     required double end,
+//     super.idleValue = 0,
+//   }) : super(
+//           builder: (context, value, child) => Transform.scale(
+//             scale: lerpDouble(1, end, value)!,
+//             child: child,
+//           ),
+//           tween: Tween<double>(begin: begin, end: end),
+//         );
+// }
+
+class ColorAnimation extends GetAnimatedBuilder<Color?> {
+  ColorAnimation({
+    super.key,
+    required super.duration,
+    required super.delay,
+    required super.child,
+    super.onComplete,
+    required Color begin,
+    required Color end,
+    Color? idleColor,
+  }) : super(
+          builder: (context, value, child) => ColorFiltered(
+            colorFilter: ColorFilter.mode(
+              Color.lerp(begin, end, value!.value.toDouble())!,
+              BlendMode.srcIn,
+            ),
+            child: child,
+          ),
+          idleValue: idleColor ?? begin,
+          tween: ColorTween(begin: begin, end: end),
+        );
+}

@@ -81,8 +81,9 @@ extension AnimationExtension on Widget {
   }
   }
 
 
   GetAnimatedBuilder slide({
   GetAnimatedBuilder slide({
-    required Offset begin,
-    required Offset end,
+    required OffsetBuilder offset,
+    double begin = 0,
+    double end = 1,
     Duration duration = _defaultDuration,
     Duration duration = _defaultDuration,
     Duration delay = _defaultDelay,
     Duration delay = _defaultDelay,
     ValueSetter<AnimationController>? onComplete,
     ValueSetter<AnimationController>? onComplete,
@@ -94,6 +95,7 @@ extension AnimationExtension on Widget {
       begin: begin,
       begin: begin,
       end: end,
       end: end,
       onComplete: onComplete,
       onComplete: onComplete,
+      offsetBuild: offset,
       child: this,
       child: this,
     );
     );
   }
   }
@@ -116,7 +118,21 @@ extension AnimationExtension on Widget {
     );
     );
   }
   }
 
 
-  GetAnimatedBuilder shake({
+  GetAnimatedBuilder spin({
+    Duration duration = _defaultDuration,
+    Duration delay = _defaultDelay,
+    ValueSetter<AnimationController>? onComplete,
+    bool isSequential = false,
+  }) {
+    return SpinAnimation(
+      duration: duration,
+      delay: _getDelay(isSequential, delay),
+      onComplete: onComplete,
+      child: this,
+    );
+  }
+
+  GetAnimatedBuilder size({
     required double begin,
     required double begin,
     required double end,
     required double end,
     Duration duration = _defaultDuration,
     Duration duration = _defaultDuration,
@@ -124,7 +140,7 @@ extension AnimationExtension on Widget {
     ValueSetter<AnimationController>? onComplete,
     ValueSetter<AnimationController>? onComplete,
     bool isSequential = false,
     bool isSequential = false,
   }) {
   }) {
-    return ShakeAnimation(
+    return SizeAnimation(
       duration: duration,
       duration: duration,
       delay: _getDelay(isSequential, delay),
       delay: _getDelay(isSequential, delay),
       begin: begin,
       begin: begin,
@@ -134,29 +150,51 @@ extension AnimationExtension on Widget {
     );
     );
   }
   }
 
 
-  GetAnimatedBuilder spin({
+  GetAnimatedBuilder blur({
+    double begin = 0,
+    double end = 15,
     Duration duration = _defaultDuration,
     Duration duration = _defaultDuration,
     Duration delay = _defaultDelay,
     Duration delay = _defaultDelay,
     ValueSetter<AnimationController>? onComplete,
     ValueSetter<AnimationController>? onComplete,
     bool isSequential = false,
     bool isSequential = false,
   }) {
   }) {
-    return SpinAnimation(
+    return BlurAnimation(
+      duration: duration,
+      delay: _getDelay(isSequential, delay),
+      begin: begin,
+      end: end,
+      onComplete: onComplete,
+      child: this,
+    );
+  }
+
+  GetAnimatedBuilder flip({
+    double begin = 0,
+    double end = 1,
+    Duration duration = _defaultDuration,
+    Duration delay = _defaultDelay,
+    ValueSetter<AnimationController>? onComplete,
+    bool isSequential = false,
+  }) {
+    return FlipAnimation(
       duration: duration,
       duration: duration,
       delay: _getDelay(isSequential, delay),
       delay: _getDelay(isSequential, delay),
+      begin: begin,
+      end: end,
       onComplete: onComplete,
       onComplete: onComplete,
       child: this,
       child: this,
     );
     );
   }
   }
 
 
-  GetAnimatedBuilder size({
-    required double begin,
-    required double end,
+  GetAnimatedBuilder wave({
+    double begin = 0,
+    double end = 1,
     Duration duration = _defaultDuration,
     Duration duration = _defaultDuration,
     Duration delay = _defaultDelay,
     Duration delay = _defaultDelay,
     ValueSetter<AnimationController>? onComplete,
     ValueSetter<AnimationController>? onComplete,
     bool isSequential = false,
     bool isSequential = false,
   }) {
   }) {
-    return SizeAnimation(
+    return WaveAnimation(
       duration: duration,
       duration: duration,
       delay: _getDelay(isSequential, delay),
       delay: _getDelay(isSequential, delay),
       begin: begin,
       begin: begin,

@@ -101,14 +101,14 @@ void main() {
 
 
     testWidgets('slide() returns a SlideAnimation',
     testWidgets('slide() returns a SlideAnimation',
         (WidgetTester tester) async {
         (WidgetTester tester) async {
-      const begin = Offset.zero;
-      const end = Offset.zero;
+      const begin = 0;
+      const end = 1;
       final widget = buildWidget();
       final widget = buildWidget();
-      final animation = widget.slide(begin: begin, end: end);
+      final animation = widget.slide(offset: (_, __) => const Offset(0, 0));
 
 
       expect(animation, isA<SlideAnimation>());
       expect(animation, isA<SlideAnimation>());
 
 
-      _testDefaultValues<Offset>(
+      _testDefaultValues(
           animation: animation, widget: widget, begin: begin, end: end);
           animation: animation, widget: widget, begin: begin, end: end);
     });
     });
 
 
@@ -130,39 +130,65 @@ void main() {
       );
       );
     });
     });
 
 
-    testWidgets('shake() returns a ShakeAnimation',
-        (WidgetTester tester) async {
+    testWidgets('spin() returns a SpinAnimation', (WidgetTester tester) async {
+      final widget = buildWidget();
+      const begin = 0.0;
+      const end = 360;
+      final animation = widget.spin();
+
+      expect(animation, isA<SpinAnimation>());
+
+      _testDefaultValues(
+          animation: animation, widget: widget, begin: begin, end: end);
+    });
+
+    testWidgets('size() returns a SizeAnimation', (WidgetTester tester) async {
+      final widget = buildWidget();
+
       const begin = 0.9;
       const begin = 0.9;
       const end = 1.1;
       const end = 1.1;
+      final animation = widget.size(begin: begin, end: end);
+
+      expect(animation, isA<SizeAnimation>());
+
+      _testDefaultValues(
+          animation: animation, widget: widget, begin: begin, end: end);
+    });
+
+    testWidgets('blur() returns a BlurAnimation', (WidgetTester tester) async {
       final widget = buildWidget();
       final widget = buildWidget();
-      final animation = widget.shake(begin: begin, end: end);
 
 
-      expect(animation, isA<ShakeAnimation>());
+      const begin = 0.9;
+      const end = 1.1;
+      final animation = widget.blur(begin: begin, end: end);
+
+      expect(animation, isA<BlurAnimation>());
 
 
       _testDefaultValues(
       _testDefaultValues(
           animation: animation, widget: widget, begin: begin, end: end);
           animation: animation, widget: widget, begin: begin, end: end);
     });
     });
 
 
-    testWidgets('spin() returns a SpinAnimation', (WidgetTester tester) async {
+    testWidgets('flip() returns a FlipAnimation', (WidgetTester tester) async {
       final widget = buildWidget();
       final widget = buildWidget();
-      const begin = 0.0;
-      const end = 360;
-      final animation = widget.spin();
 
 
-      expect(animation, isA<SpinAnimation>());
+      const begin = 0.9;
+      const end = 1.1;
+      final animation = widget.flip(begin: begin, end: end);
+
+      expect(animation, isA<FlipAnimation>());
 
 
       _testDefaultValues(
       _testDefaultValues(
           animation: animation, widget: widget, begin: begin, end: end);
           animation: animation, widget: widget, begin: begin, end: end);
     });
     });
 
 
-    testWidgets('size() returns a SizeAnimation', (WidgetTester tester) async {
+    testWidgets('wave() returns a FlipAnimation', (WidgetTester tester) async {
       final widget = buildWidget();
       final widget = buildWidget();
 
 
       const begin = 0.9;
       const begin = 0.9;
       const end = 1.1;
       const end = 1.1;
-      final animation = widget.size(begin: begin, end: end);
+      final animation = widget.wave(begin: begin, end: end);
 
 
-      expect(animation, isA<SizeAnimation>());
+      expect(animation, isA<WaveAnimation>());
 
 
       _testDefaultValues(
       _testDefaultValues(
           animation: animation, widget: widget, begin: begin, end: end);
           animation: animation, widget: widget, begin: begin, end: end);

@@ -325,13 +325,42 @@ void main() {
     await tester.pumpAndSettle();
     await tester.pumpAndSettle();
   });
   });
 
 
+  testWidgets('WaveAnimation', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      WaveAnimation(
+        duration: const Duration(seconds: 1),
+        delay: Duration.zero,
+        begin: 1.0,
+        end: 2.0,
+        child: Container(),
+      ),
+    );
+    expect(find.byType(WaveAnimation), findsOneWidget);
+    await tester.pumpAndSettle();
+  });
+
+  testWidgets('WobbleAnimation', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      WobbleAnimation(
+        duration: const Duration(seconds: 1),
+        delay: Duration.zero,
+        begin: 1.0,
+        end: 2.0,
+        child: Container(),
+      ),
+    );
+    expect(find.byType(WobbleAnimation), findsOneWidget);
+    await tester.pumpAndSettle();
+  });
+
   testWidgets('SlideAnimation', (WidgetTester tester) async {
   testWidgets('SlideAnimation', (WidgetTester tester) async {
     await tester.pumpWidget(
     await tester.pumpWidget(
       SlideAnimation(
       SlideAnimation(
+        offsetBuild: (p0, p1) => const Offset(1.0, 1.0),
         duration: const Duration(seconds: 1),
         duration: const Duration(seconds: 1),
         delay: Duration.zero,
         delay: Duration.zero,
-        begin: Offset.zero,
-        end: const Offset(1.0, 1.0),
+        begin: 0,
+        end: 1,
         child: Container(),
         child: Container(),
       ),
       ),
     );
     );
@@ -339,31 +368,81 @@ void main() {
     await tester.pumpAndSettle();
     await tester.pumpAndSettle();
   });
   });
 
 
-  testWidgets('BounceAnimation', (WidgetTester tester) async {
+  testWidgets('SlideInLeftAnimation', (WidgetTester tester) async {
     await tester.pumpWidget(
     await tester.pumpWidget(
-      BounceAnimation(
+      _Wrapper(
+        child: SlideInLeftAnimation(
           duration: const Duration(seconds: 1),
           duration: const Duration(seconds: 1),
           delay: Duration.zero,
           delay: Duration.zero,
-        begin: 0.0,
-        end: 1.0,
+          begin: 1.0,
+          end: 2.0,
           child: Container(),
           child: Container(),
         ),
         ),
+      ),
     );
     );
-    expect(find.byType(BounceAnimation), findsOneWidget);
+    expect(find.byType(SlideInLeftAnimation), findsOneWidget);
+    await tester.pumpAndSettle();
+  });
+
+  testWidgets('SlideInRightAnimation', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      _Wrapper(
+        child: SlideInRightAnimation(
+          duration: const Duration(seconds: 1),
+          delay: Duration.zero,
+          begin: 1.0,
+          end: 2.0,
+          child: Container(),
+        ),
+      ),
+    );
+    expect(find.byType(SlideInRightAnimation), findsOneWidget);
+    await tester.pumpAndSettle();
+  });
+
+  testWidgets('SlideInUpAnimation', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      _Wrapper(
+        child: SlideInUpAnimation(
+          duration: const Duration(seconds: 1),
+          delay: Duration.zero,
+          begin: 1.0,
+          end: 2.0,
+          child: Container(),
+        ),
+      ),
+    );
+    expect(find.byType(SlideInUpAnimation), findsOneWidget);
+    await tester.pumpAndSettle();
+  });
+
+  testWidgets('SlideInDownAnimation', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      _Wrapper(
+        child: SlideInDownAnimation(
+          duration: const Duration(seconds: 1),
+          delay: Duration.zero,
+          begin: 1.0,
+          end: 2.0,
+          child: Container(),
+        ),
+      ),
+    );
+    expect(find.byType(SlideInDownAnimation), findsOneWidget);
     await tester.pumpAndSettle();
     await tester.pumpAndSettle();
   });
   });
 
 
-  testWidgets('ShakeAnimation', (WidgetTester tester) async {
+  testWidgets('BounceAnimation', (WidgetTester tester) async {
     await tester.pumpWidget(
     await tester.pumpWidget(
-      ShakeAnimation(
+      BounceAnimation(
         duration: const Duration(seconds: 1),
         duration: const Duration(seconds: 1),
         delay: Duration.zero,
         delay: Duration.zero,
         begin: 0.0,
         begin: 0.0,
-        end: 10.0,
+        end: 1.0,
         child: Container(),
         child: Container(),
       ),
       ),
     );
     );
-    expect(find.byType(ShakeAnimation), findsOneWidget);
+    expect(find.byType(BounceAnimation), findsOneWidget);
     await tester.pumpAndSettle();
     await tester.pumpAndSettle();
   });
   });
 
 
@@ -406,4 +485,32 @@ void main() {
     expect(find.byType(SizeAnimation), findsOneWidget);
     expect(find.byType(SizeAnimation), findsOneWidget);
     await tester.pumpAndSettle();
     await tester.pumpAndSettle();
   });
   });
+
+  testWidgets('BlurAnimation', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      BlurAnimation(
+        duration: const Duration(seconds: 1),
+        delay: Duration.zero,
+        begin: 1.0,
+        end: 2.0,
+        child: Container(),
+      ),
+    );
+    expect(find.byType(BlurAnimation), findsOneWidget);
+    await tester.pumpAndSettle();
+  });
+
+  testWidgets('FlipAnimation', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      FlipAnimation(
+        duration: const Duration(seconds: 1),
+        delay: Duration.zero,
+        begin: 1.0,
+        end: 2.0,
+        child: Container(),
+      ),
+    );
+    expect(find.byType(FlipAnimation), findsOneWidget);
+    await tester.pumpAndSettle();
+  });
 }
 }