fix tests

lib/android/app/src/test/java/com/reactnativenavigation/BaseTest.java

 package com.reactnativenavigation;
 
-import com.facebook.react.uimanager.DisplayMetricsHolder;
-
-import org.junit.Before;
 import org.junit.runner.RunWith;
 import org.robolectric.RobolectricTestRunner;
-import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
 
 @RunWith(RobolectricTestRunner.class)
 @Config(sdk = 25, constants = BuildConfig.class, manifest = "/../../../../../src/test/AndroidManifest.xml")
 public abstract class BaseTest {
 
-	@Before
-	public void beforeEach() {
-		DisplayMetricsHolder.initDisplayMetrics(RuntimeEnvironment.application);
-	}
 }

lib/android/app/src/test/java/com/reactnativenavigation/TestApplication.java

 package com.reactnativenavigation;
 
 import com.reactnativenavigation.controllers.ActivityLifecycleDelegate;
-import com.reactnativenavigation.controllers.CommandsHandler;
-import com.reactnativenavigation.mocks.TestDevPermissionRequest;
-import com.reactnativenavigation.mocks.TestReactNativeHost;
-import com.reactnativenavigation.react.ReactRootViewCreatorImpl;
+import com.reactnativenavigation.react.NavigationReactNativeHost;
+
+import static org.mockito.Mockito.mock;
 
 public class TestApplication extends NavigationApplication {
 
 
 	@Override
 	protected void init() {
-		reactNativeHost = new TestReactNativeHost(this, isDebug(), new CommandsHandler(new ReactRootViewCreatorImpl()));
-		activityLifecycleDelegate = new ActivityLifecycleDelegate(reactNativeHost.getReactInstanceManager(), new TestDevPermissionRequest());
+		reactNativeHost = mock(NavigationReactNativeHost.class);
+		activityLifecycleDelegate = mock(ActivityLifecycleDelegate.class);
 	}
 }

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

-package com.reactnativenavigation.mocks;
-
-import com.reactnativenavigation.react.DevPermissionRequest;
-
-public class TestDevPermissionRequest implements DevPermissionRequest {
-	@Override
-	public boolean shouldAskPermission() {
-		return false;
-	}
-
-	@Override
-	public void askPermission() {
-		// nothing
-	}
-}