some more tests android

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

@@ -77,6 +77,9 @@ public class ContainerViewController extends ViewController {
 
 	public void applyNavigationOptions(final NavigationOptions options) {
 		navigationOptions.mergeWith(options);
+		if (getParentStackController() != null) {
+			getParentStackController().setTitle(navigationOptions.title);
+		}
 	}
 
 	public NavigationOptions getNavigationOptions() {

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

@@ -137,6 +137,11 @@ public class StackController extends ParentController {
 	}
 
 	public TopBar getTopBar() {
+		ensureViewIsCreated();
 		return topBar;
 	}
+
+	private void ensureViewIsCreated() {
+		getView();
+	}
 }

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

@@ -18,6 +18,6 @@ public class TopBar extends AppBarLayout {
 	}
 
 	public String getTitle() {
-		return titleBar.getTitle().toString();
+		return titleBar.getTitle() != null ? titleBar.getTitle().toString() : "";
 	}
 }

lib/android/app/src/test/java/com/reactnativenavigation/mocks/SimpleContainerViewController.java

@@ -0,0 +1,12 @@
+package com.reactnativenavigation.mocks;
+
+import android.app.Activity;
+
+import com.reactnativenavigation.parse.NavigationOptions;
+import com.reactnativenavigation.viewcontrollers.ContainerViewController;
+
+public class SimpleContainerViewController extends ContainerViewController {
+	public SimpleContainerViewController(final Activity activity, final String id) {
+		super(activity, id, "theContainerName", new TestContainerViewCreator(), new NavigationOptions());
+	}
+}

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

@@ -4,8 +4,8 @@ import android.app.Activity;
 import android.support.annotation.NonNull;
 
 import com.reactnativenavigation.BaseTest;
+import com.reactnativenavigation.mocks.SimpleContainerViewController;
 import com.reactnativenavigation.mocks.SimpleViewController;
-import com.reactnativenavigation.mocks.TestContainerViewCreator;
 import com.reactnativenavigation.mocks.TestStackAnimator;
 import com.reactnativenavigation.parse.NavigationOptions;
 import com.reactnativenavigation.utils.CompatUtils;
@@ -191,7 +191,7 @@ public class NavigatorTest extends BaseTest {
 
 	@Test
 	public void setOptions_CallsApplyNavigationOptions() {
-		ContainerViewController containerVc = new ContainerViewController(activity, "theId", "theName", new TestContainerViewCreator(), new NavigationOptions());
+		ContainerViewController containerVc = new SimpleContainerViewController(activity, "theId");
 		uut.setRoot(containerVc);
 		assertThat(containerVc.getNavigationOptions().title).isEmpty();
 
@@ -204,8 +204,22 @@ public class NavigatorTest extends BaseTest {
 
 	@Test
 	public void setOptions_AffectsOnlyContainerViewControllers() {
-		uut.setRoot(child1);
-		uut.setOptions(child1.getId(), new NavigationOptions());
+		uut.setOptions("some unknown child id", new NavigationOptions());
+	}
+
+	@Test
+	public void setOptions_ActuallyAffectsTheTitleView() throws Exception {
+		ContainerViewController containerVc = new SimpleContainerViewController(activity, "theId");
+		StackController stackController = new StackController(activity, "stackId", new TestStackAnimator());
+		stackController.push(containerVc);
+		uut.setRoot(stackController);
+		assertThat(stackController.getTopBar().getTitle()).isEmpty();
+
+		NavigationOptions opts = new NavigationOptions();
+		opts.title = "the new title";
+		uut.setOptions("theId", opts);
+
+		assertThat(stackController.getTopBar().getTitle()).isEqualTo("the new title");
 	}
 
 	@NonNull

lib/android/app/src/test/java/com/reactnativenavigation/views/TopBarTest.java

@@ -0,0 +1,18 @@
+package com.reactnativenavigation.views;
+
+import com.reactnativenavigation.BaseTest;
+
+import org.junit.Test;
+
+import static org.assertj.core.api.Java6Assertions.assertThat;
+
+public class TopBarTest extends BaseTest {
+	@Test
+	public void title() throws Exception {
+		TopBar topBar = new TopBar(newActivity());
+		assertThat(topBar.getTitle()).isEmpty();
+
+		topBar.setTitle("new title");
+		assertThat(topBar.getTitle()).isEqualTo("new title");
+	}
+}