fix tests

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/ParentControllerTest.java

 	}
 
 	@Test
-	public void lifecycleMethodsPassDownToChildren_onAppear() throws Exception {
-		ViewController child1 = spy(new SimpleViewController(activity, "child1"));
-		children.add(child1);
-
-		verify(child1, times(0)).onViewAppeared();
-		uut.onViewAppeared();
-		verify(child1, times(1)).onViewAppeared();
-	}
-
-	@Test
-	public void lifecycleMethodsPassDownToChildren_onDisappear() throws Exception {
-		ViewController child1 = spy(new SimpleViewController(activity, "child1"));
-		children.add(child1);
-
-		verify(child1, times(0)).onViewDisappear();
-		uut.onViewDisappear();
-		verify(child1, times(1)).onViewDisappear();
-	}
-
-	@Test
-	public void lifecycleMethodsPassDownToChildren_onDestroy() throws Exception {
+	public void destory_DestorysChildren() throws Exception {
 		ViewController child1 = spy(new SimpleViewController(activity, "child1"));
 		children.add(child1);
 

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/ViewControllerTest.java

 import android.app.Activity;
 import android.view.View;
 import android.view.ViewParent;
+import android.widget.LinearLayout;
 
 import com.reactnativenavigation.BaseTest;
 import com.reactnativenavigation.mocks.SimpleViewController;
 
 import java.lang.reflect.Field;
 
-import static org.assertj.core.api.Assertions.fail;
 import static org.assertj.core.api.Java6Assertions.assertThat;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
 
 	@Test
 	public void onDestroy_RemovesSelfFromParentIfExists() throws Exception {
-		fail("implement");
+		LinearLayout parent = new LinearLayout(activity);
+		parent.addView(uut.getView());
+
+		uut.destroy();
+		assertThat(parent.getChildCount()).withFailMessage("expected not to have children").isZero();
 	}
 }