@Test
public void pickingCorrectViewInterface() {
ViewWithMulitpleInterfaces view = new ViewWithMulitpleInterfaces();
TestNullObjectPresenter presenter = new TestNullObjectPresenter();
presenter.attachView(view);
Assert.assertNotNull(presenter.getView());
Assert.assertTrue(view == presenter.getView());
presenter.detachView(false);
Assert.assertNotNull(presenter.getView());
Assert.assertFalse(presenter.getView() == view);
// Invoke methods on proxy
presenter.getView().showFoo(new TestData());
presenter.getView().showThat();
}
@Test
public void testAttachDetach() {
TestNullObjectPresenter presenter = new TestNullObjectPresenter();
try {
// NullPointer exception should be thrown
presenter.getView();
Assert.fail("Nullpointer Exception should be thrown but haven't");
} catch (NullPointerException e) {
// Expected exception
}
TestView view =
new TestView() {
@Override
public void showFoo(TestData data) {}
@Override
public void showThat() {}
};
presenter.attachView(view);
Assert.assertNotNull(presenter.getView());
Assert.assertTrue(presenter.getView() == view);
// Test with retainInstance == false
presenter.detachView(false);
Assert.assertNotNull(presenter.getView());
Assert.assertTrue(presenter.getView() != view); // Null Object view
// Reattach real view
presenter.attachView(view);
Assert.assertNotNull(presenter.getView());
Assert.assertTrue(presenter.getView() == view);
// Test with retainInstance == true
presenter.detachView(true);
Assert.assertNotNull(presenter.getView());
Assert.assertTrue(presenter.getView() != view); // Null Object view
}