Add tests

Author: janicduplessis

Libraries/Animated/src/AnimatedImplementation.js

@@ -725,7 +725,7 @@ class AnimatedValue extends AnimatedWithChildren {
 
   _startListeningToNativeValueUpdates() {
     if (this.__nativeAnimatedValueListener ||
-        !NativeAnimatedHelper.supportNativeListener()) {
+        !NativeAnimatedHelper.supportsNativeListener()) {
       return;
     }
 
@@ -740,7 +740,7 @@ class AnimatedValue extends AnimatedWithChildren {
 
   _stopListeningForNativeValueUpdates() {
     if (!this.__nativeAnimatedValueListener ||
-        !NativeAnimatedHelper.supportNativeListener()) {
+        !NativeAnimatedHelper.supportsNativeListener()) {
       return;
     }
 

Libraries/Animated/src/NativeAnimatedHelper.js

@@ -148,7 +148,7 @@ function assertNativeAnimatedModule(): void {
 }
 
 // TODO: remove this when iOS supports native listeners.
-function supportNativeListener(): bool {
+function supportsNativeListener(): bool {
   return !!NativeAnimatedModule.startListeningToAnimatedNodeValue;
 }
 
@@ -161,5 +161,5 @@ module.exports = {
   generateNewNodeTag,
   generateNewAnimationId,
   assertNativeAnimatedModule,
-  supportNativeListener,
+  supportsNativeListener,
 };

ReactAndroid/src/main/java/com/facebook/react/animated/AnimatedNodeValueListener.java

@@ -12,6 +12,6 @@
 /**
  * Interface used to listen to {@link ValueAnimatedNode} updates.
  */
-/* package */ interface AnimatedNodeValueListener {
+public interface AnimatedNodeValueListener {
   void onValueUpdate(double value);
 }

ReactAndroid/src/test/java/com/facebook/react/animated/NativeAnimatedNodeTraversalTest.java

@@ -140,6 +140,64 @@ public void testFramesAnimation() {
     verifyNoMoreInteractions(mUIImplementationMock);
   }
 
+  @Test
+  public void testNodeValueListenerIfNotListening() {
+    int nodeId = 1;
+
+    createSimpleAnimatedViewWithOpacity(1000, 0d);
+    JavaOnlyArray frames = JavaOnlyArray.of(0d, 0.2d, 0.4d, 0.6d, 0.8d, 1d);
+
+    Callback animationCallback = mock(Callback.class);
+    AnimatedNodeValueListener valueListener = mock(AnimatedNodeValueListener.class);
+
+    mNativeAnimatedNodesManager.startListeningToAnimatedNodeValue(nodeId, valueListener);
+    mNativeAnimatedNodesManager.startAnimatingNode(
+      1,
+      nodeId,
+      JavaOnlyMap.of("type", "frames", "frames", frames, "toValue", 1d),
+      animationCallback);
+
+    mNativeAnimatedNodesManager.runUpdates(nextFrameTime());
+    verify(valueListener).onValueUpdate(eq(0d));
+
+    mNativeAnimatedNodesManager.stopListeningToAnimatedNodeValue(nodeId);
+
+    reset(valueListener);
+    mNativeAnimatedNodesManager.runUpdates(nextFrameTime());
+    verifyNoMoreInteractions(valueListener);
+  }
+
+  @Test
+  public void testNodeValueListenerIfListening() {
+    int nodeId = 1;
+
+    createSimpleAnimatedViewWithOpacity(1000, 0d);
+    JavaOnlyArray frames = JavaOnlyArray.of(0d, 0.2d, 0.4d, 0.6d, 0.8d, 1d);
+
+    Callback animationCallback = mock(Callback.class);
+    AnimatedNodeValueListener valueListener = mock(AnimatedNodeValueListener.class);
+
+    mNativeAnimatedNodesManager.startListeningToAnimatedNodeValue(nodeId, valueListener);
+    mNativeAnimatedNodesManager.startAnimatingNode(
+      1,
+      nodeId,
+      JavaOnlyMap.of("type", "frames", "frames", frames, "toValue", 1d),
+      animationCallback);
+
+    mNativeAnimatedNodesManager.runUpdates(nextFrameTime());
+    verify(valueListener).onValueUpdate(eq(0d));
+
+    for (int i = 0; i < frames.size(); i++) {
+      reset(valueListener);
+      mNativeAnimatedNodesManager.runUpdates(nextFrameTime());
+      verify(valueListener).onValueUpdate(eq(frames.getDouble(i)));
+    }
+
+    reset(valueListener);
+    mNativeAnimatedNodesManager.runUpdates(nextFrameTime());
+    verifyNoMoreInteractions(valueListener);
+  }
+
   @Test
   public void testAnimationCallbackFinish() {
     createSimpleAnimatedViewWithOpacity(1000, 0d);