pop specific

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

 
 	public void push(final ViewController child) {
 		ViewController previousTop = peek();
+
 		child.setParentStackController(this);
 		childControllers.push(child);
 		getView().addView(child.getView());
+
 		if (previousTop != null) {
 			getView().removeView(previousTop.getView());
 		}
 	}
 
 	public void pop() {
-		if (canPop()) {
-			ViewController poppedController = childControllers.pop();
-			getView().removeView(poppedController.getView());
-			ViewController previousTop = peek();
-			getView().addView(previousTop.getView());
+		if (!canPop()) {
+			return;
+		}
+		ViewController poppedController = childControllers.pop();
+		getView().removeView(poppedController.getView());
+
+		ViewController previousTop = peek();
+		getView().addView(previousTop.getView());
+	}
+
+	public void pop(final ViewController childController) {
+		if (peek() == childController) {
+			pop();
+		} else {
+			childControllers.remove(childController);
 		}
 	}
 
 	protected ViewGroup onCreateView() {
 		return new FrameLayout(getActivity());
 	}
+
+//	public ViewController getChildController(final int index) {
+//		Iterator<ViewController> it = childControllers.descendingIterator();
+//		int currentIndex = 0;
+//		while (it.hasNext()) {
+//			ViewController controller = it.next();
+//			if (currentIndex == index) {
+//				return controller;
+//			}
+//			currentIndex++;
+//		}
+//		return null;
+//	}
 }

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

 import com.reactnativenavigation.viewcontrollers.ViewController;
 
 public class SimpleViewController extends ViewController {
-	public SimpleViewController(final Activity activity) {
+	private final String name;
+
+	public SimpleViewController(final Activity activity, String name) {
 		super(activity);
+		this.name = name;
 	}
 
 	@Override
 	protected View onCreateView() {
 		return new View(getActivity());
 	}
+
+	@Override
+	public String toString() {
+		return "SimpleViewController " + name;
+	}
 }

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

 		super.beforeEach();
 		activity = newActivity();
 		uut = new StackController(activity);
-		child1 = new SimpleViewController(activity);
-		child2 = new SimpleViewController(activity);
-		child3 = new SimpleViewController(activity);
+		child1 = new SimpleViewController(activity, "child1");
+		child2 = new SimpleViewController(activity, "child2");
+		child3 = new SimpleViewController(activity, "child3");
 	}
 
 	@Test
 	public void holdsAStackOfViewControllers() throws Exception {
 		assertThat(uut.getChildControllers()).isEmpty();
 		uut.setChildControllers(child1, child2, child3);
-		assertThat(uut.getChildControllers()).containsExactly(child3, child2, child1);
-		assertThat(uut.getChildControllers().peek()).isEqualTo(child3);
+		assertThat(uut.getChildControllers()).containsOnly(child3, child2, child1);
+		assertThat(uut.peek()).isEqualTo(child3);
 	}
 
 	@Test
 	public void push() throws Exception {
 		assertThat(uut.getChildControllers()).isEmpty();
 		uut.push(child1);
-		assertThat(uut.getChildControllers()).containsExactly(child1);
+		assertThat(uut.getChildControllers()).containsOnly(child1);
 	}
 
 	@Test
 	public void pop() throws Exception {
 		uut.push(child1);
 		uut.push(child2);
-		assertThat(uut.getChildControllers()).containsExactly(child2, child1);
+		assertThat(uut.getChildControllers()).containsOnly(child2, child1);
 		uut.pop();
-		assertThat(uut.getChildControllers()).containsExactly(child1);
+		assertThat(uut.getChildControllers()).containsOnly(child1);
 	}
 
 	@Test
 
 	@Test
 	public void popDoesNothingWhenZeroOrOneChild() throws Exception {
-		assertThat(uut.getChildControllers().size()).isZero();
+		assertThat(uut.getChildControllers()).isEmpty();
 		uut.pop();
-		assertThat(uut.getChildControllers().size()).isZero();
+		assertThat(uut.getChildControllers()).isEmpty();
 
 		uut.push(child1);
 		uut.pop();
-		assertThat(uut.getChildControllers().size()).isEqualTo(1);
+		assertThat(uut.getChildControllers()).containsOnly(child1);
 	}
 
 	@Test
 	public void canPopWhenSizeIsMoreThanOne() throws Exception {
-		assertThat(uut.getChildControllers().size()).isZero();
+		assertThat(uut.getChildControllers()).isEmpty();
 		assertThat(uut.canPop()).isFalse();
 		uut.push(child1);
-		assertThat(uut.getChildControllers().size()).isEqualTo(1);
+		assertThat(uut.getChildControllers()).containsOnly(child1);
 		assertThat(uut.canPop()).isFalse();
 		uut.push(child2);
-		assertThat(uut.getChildControllers().size()).isEqualTo(2);
+		assertThat(uut.getChildControllers()).containsOnly(child1, child2);
 		assertThat(uut.canPop()).isTrue();
 	}
 
 	public void pushAddsToViewTree() throws Exception {
 		assertThat(uut.getView().getChildCount()).isZero();
 		uut.push(child1);
-		assertThat(uut.getView().getChildCount()).isEqualTo(1);
+		assertHasSingleChildViewOfController(child1);
 	}
 
 	@Test
 	public void pushRemovesPreviousFromTree() throws Exception {
 		assertThat(uut.getView().getChildCount()).isZero();
 		uut.push(child1);
-		assertThat(uut.getView().getChildCount()).isEqualTo(1);
+		assertHasSingleChildViewOfController(child1);
 		uut.push(child2);
-		assertThat(uut.getView().getChildCount()).isEqualTo(1);
+		assertHasSingleChildViewOfController(child2);
 	}
 
 	@Test
 	public void popReplacesViewWithPrevious() throws Exception {
 		uut.push(child1);
 		uut.push(child2);
-		assertThat(uut.getView().getChildCount()).isEqualTo(1);
-		assertThat(uut.getView().getChildAt(0)).isEqualTo(child2.getView());
+		assertHasSingleChildViewOfController(child2);
 		uut.pop();
+		assertHasSingleChildViewOfController(child1);
+	}
+
+	@Test
+	public void popSpecificWhenTopIsRegularPop() throws Exception {
+		uut.push(child1);
+		uut.push(child2);
+		uut.pop(child2);
+		assertThat(uut.getChildControllers()).containsOnly(child1);
+		assertHasSingleChildViewOfController(child1);
+	}
+
+	@Test
+	public void popSpecificDeepInStack() throws Exception {
+		uut.push(child1);
+		uut.push(child2);
+		assertHasSingleChildViewOfController(child2);
+
+		uut.pop(child1);
+		assertThat(uut.getChildControllers()).containsOnly(child2);
+		assertHasSingleChildViewOfController(child2);
+	}
+
+//	@Test
+//	public void getControllerAtIndex() throws Exception {
+//		uut.push(child1);
+//		uut.push(child2);
+//		uut.push(child3);
+//		assertThat(uut.getChildController(0)).isEqualTo(child1);
+//		assertThat(uut.getChildController(1)).isEqualTo(child2);
+//		assertThat(uut.getChildController(2)).isEqualTo(child3);
+//		assertThat(uut.getChildController(3)).isNull();
+//	}
+
+	private void assertHasSingleChildViewOfController(ViewController childController) {
 		assertThat(uut.getView().getChildCount()).isEqualTo(1);
-		assertThat(uut.getView().getChildAt(0)).isEqualTo(child1.getView());
+		assertThat(uut.getView().getChildAt(0)).isEqualTo(childController.getView());
 	}
 }

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

 	public void beforeEach() {
 		super.beforeEach();
 		activity = newActivity();
-		uut = new SimpleViewController(activity);
+		uut = new SimpleViewController(activity, "uut");
 	}
 
 	@Test