f

lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/StackController.java

 
     @RestrictTo(RestrictTo.Scope.TESTS)
     TopBar getTopBar() {
-        return topBarController.getTopBar();
+        return topBarController.getView();
     }
 
     @RestrictTo(RestrictTo.Scope.TESTS)

lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/topbar/TopBarController.java

 public class TopBarController {
     private TopBar topBar;
 
-    public View createTopBar(Context context, ReactViewCreator buttonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarBackgroundViewCreator backgroundViewCreator, TopBarButtonController.OnClickListener topBarButtonClickListener, StackLayout stackLayout) {
+    public View createView(Context context, ReactViewCreator buttonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarBackgroundViewCreator backgroundViewCreator, TopBarButtonController.OnClickListener topBarButtonClickListener, StackLayout stackLayout) {
         if (topBar == null) {
-            topBar = new TopBar(context, buttonCreator, titleBarReactViewCreator, backgroundViewCreator, topBarButtonClickListener, stackLayout);
+            topBar = createTopBar(context, buttonCreator, titleBarReactViewCreator, backgroundViewCreator, topBarButtonClickListener, stackLayout);
             topBar.setId(CompatUtils.generateViewId());
         }
         return topBar;
     }
 
+    protected TopBar createTopBar(Context context, ReactViewCreator buttonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarBackgroundViewCreator backgroundViewCreator, TopBarButtonController.OnClickListener topBarButtonClickListener, StackLayout stackLayout) {
+        return new TopBar(context, buttonCreator, titleBarReactViewCreator, backgroundViewCreator, topBarButtonClickListener, stackLayout);
+    }
+
     public void clear() {
         topBar.clear();
     }
 
-    public TopBar getTopBar() {
+    public TopBar getView() {
         return topBar;
     }
 

lib/android/app/src/main/java/com/reactnativenavigation/views/StackLayout.java

         super(context);
         this.stackId = stackId;
         createLayout(topBarButtonCreator, titleBarReactViewCreator, topBarBackgroundViewCreator, topBarController, topBarButtonClickListener);
-        optionsPresenter = new OptionsPresenter(topBarController.getTopBar());
+        optionsPresenter = new OptionsPresenter(topBarController.getView());
         setContentDescription("StackLayout");
     }
 
     private void createLayout(ReactViewCreator buttonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarBackgroundViewCreator BackgroundViewCreator, TopBarController topBarController, TopBarButtonController.OnClickListener topBarButtonClickListener) {
-        addView(topBarController.createTopBar(getContext(), buttonCreator, titleBarReactViewCreator, BackgroundViewCreator, topBarButtonClickListener, this), MATCH_PARENT, WRAP_CONTENT);
+        addView(topBarController.createView(getContext(), buttonCreator, titleBarReactViewCreator, BackgroundViewCreator, topBarButtonClickListener, this), MATCH_PARENT, WRAP_CONTENT);
     }
 
     public void applyChildOptions(Options options) {

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

+package com.reactnativenavigation.viewcontrollers;
+
+import android.content.Context;
+import android.support.annotation.NonNull;
+
+import com.reactnativenavigation.BaseTest;
+import com.reactnativenavigation.mocks.TitleBarReactViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarBackgroundViewCreatorMock;
+import com.reactnativenavigation.mocks.TopBarButtonCreatorMock;
+import com.reactnativenavigation.viewcontrollers.topbar.TopBarController;
+import com.reactnativenavigation.views.StackLayout;
+import com.reactnativenavigation.views.titlebar.TitleBar;
+import com.reactnativenavigation.views.titlebar.TitleBarReactViewCreator;
+import com.reactnativenavigation.views.topbar.TopBar;
+import com.reactnativenavigation.views.topbar.TopBarBackgroundViewCreator;
+
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+public class TopBarControllerTest extends BaseTest {
+
+    private TopBarController uut;
+
+    @Override
+    public void beforeEach() {
+        uut = new TopBarController();
+    }
+
+    @Test
+    public void clear() {
+        final TitleBar[] titleBar = new TitleBar[1];
+        uut = new TopBarController() {
+            @NonNull
+            @Override
+            protected TopBar createTopBar(Context context, ReactViewCreator buttonCreator, TitleBarReactViewCreator titleBarReactViewCreator, TopBarBackgroundViewCreator backgroundViewCreator, TopBarButtonController.OnClickListener topBarButtonClickListener, StackLayout stackLayout) {
+                return new TopBar(context, buttonCreator, titleBarReactViewCreator, backgroundViewCreator, topBarButtonClickListener, stackLayout) {
+                    @Override
+                    protected TitleBar createTitleBar(Context context, ReactViewCreator buttonCreator, TitleBarReactViewCreator reactViewCreator, TopBarButtonController.OnClickListener onClickListener) {
+                        titleBar[0] = spy(super.createTitleBar(context, buttonCreator, reactViewCreator, onClickListener));
+                        return titleBar[0];
+                    }
+                };
+            }
+        };
+        uut.createView(newActivity(), new TopBarButtonCreatorMock(), new TitleBarReactViewCreatorMock(), new TopBarBackgroundViewCreatorMock(), buttonId -> { }, Mockito.mock(StackLayout.class));
+        uut.clear();
+        verify(titleBar[0], times(1)).clear();
+    }
+}