Merge "Fix NPE of AccessibilityShortcutPreferenceFragmentTest."

import androidx.annotation.Nullable;

import androidx.appcompat.app.AlertDialog;

import androidx.fragment.app.FragmentActivity;

import androidx.preference.PreferenceManager;

import androidx.preference.PreferenceScreen;

import androidx.test.core.app.ApplicationProvider;

import org.mockito.Answers;

import org.mockito.Mock;

import org.mockito.MockitoAnnotations;

import org.robolectric.Robolectric;

import org.robolectric.RobolectricTestRunner;

import org.robolectric.annotation.Config;

import org.robolectric.shadow.api.Shadow;

        when(mFragment.getPreferenceManager()).thenReturn(mPreferenceManager);

        when(mFragment.getPreferenceManager().getContext()).thenReturn(mContext);

        when(mFragment.getContext()).thenReturn(mContext);

        when(mFragment.getActivity()).thenReturn(Robolectric.setupActivity(FragmentActivity.class));

        mScreen = spy(new PreferenceScreen(mContext, null));

        when(mScreen.getPreferenceManager()).thenReturn(mPreferenceManager);

        doReturn(mScreen).when(mFragment).getPreferenceScreen();