JUnit Using Android Studio AssertionFailedError: Exception in constructor:

Hi am new to Android Studio and nwo we trying to implement JUnit test using it. But am facing error like AssertionFailedError: Exception in constructor:

The below is my code how I tried to implement.

public class MenuMainActivityTest extends ActivityInstrumentationTestCase2<MenuActivity> {

private MenuActivity mActivity;
SearchPg fragSearch = new SearchPg();

public MenuActivityTest() {
    super(MenuMainActivity.class);
}

@Override
protected void setUp() throws Exception {
    super.setUp();
    mActivity = getActivity();
}

private Fragment startFragment(Fragment fragment) {

    FragmentTransaction trans = mActivity.getSupportFragmentManager().beginTransaction();
    trans.add(R.id.searchScroll, fragment, "tag");
    trans.commit();
    Fragment frag = mActivity.getSupportFragmentManager().findFragmentByTag("tag");
    return frag;

}

public void testFragment() {
    MenuMainActivity fragment = new MenuMainActivity();

};

Fragment frag = startFragment(fragSearch);

}