top bar hide test (#2076)

AndroidE2E/app/src/androidTest/java/com/reactnativenavigation/e2e/androide2e/NavigationOptionsTest.java

@@ -4,6 +4,8 @@ import android.support.test.uiautomator.By;
 
 import org.junit.Test;
 
+import static org.assertj.core.api.Java6Assertions.assertThat;
+
 public class NavigationOptionsTest extends BaseTest {
 
 	@Test
@@ -19,4 +21,15 @@ public class NavigationOptionsTest extends BaseTest {
 		elementByText("DYNAMIC OPTIONS").click();
 		assertExists(By.text("Dynamic Title"));
 	}
+
+	@Test
+	public void testTopBarHidden() throws Exception {
+		elementByText("PUSH OPTIONS SCREEN").click();
+		int topWithNavigation = elementByText("HIDE TOP BAR").getVisibleBounds().top;
+		elementByText("HIDE TOP BAR").click();
+		int topWithoutNavigation = elementByText("HIDE TOP BAR").getVisibleBounds().top;
+		assertThat(topWithoutNavigation).isLessThan(topWithNavigation);
+		elementByText("SHOW TOP BAR").click();
+		assertExists(By.text("Static Title"));
+	}
 }