Why shadowOf(activity).getOptionsMenu(); returns null?

Question

Android

Hello.
There is no experience with tests (somehow not everyone is ready to pay, and those who are ready do not have the tasks that require testing)
A simple example with robolectric

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21)
public class MainActivityTest {
    @Test
    public void onCreateShouldInflateTheMenu() {
        Activity activity = Robolectric.setupActivity(MainActivity.class);

        final Menu menu = shadowOf(activity).getOptionsMenu();
      
       assertThat(menu.findItem(R.id.action_settings).getTitle()).isEqualTo("Settings");
    }
}

crashes with npe since menu is null, but at least

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21)
public class MainActivityTest {
    @Test
    public void onCreateShouldInflateTheMenu() {
        Activity activity = Robolectric.setupActivity(MainActivity.class);

        final Menu menu = shadowOf(activity).getOptionsMenu();
        assertThat(menu).isEqualTo(null);
    }
}

green =))
An example is almost one to one with the docks, how is it treated?