tests/robotests/src/com/android/settings/core/InstrumentedPreferenceFragmentTest.java

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */

package com.android.settings.core;

import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyInt;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import android.os.Bundle;

import androidx.fragment.app.FragmentActivity;
import androidx.preference.PreferenceManager;
import androidx.preference.PreferenceScreen;

import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import com.android.settings.R;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.util.ReflectionHelpers;

@RunWith(RobolectricTestRunner.class)
public class InstrumentedPreferenceFragmentTest {

    @Mock
    private PreferenceScreen mScreen;
    @Mock
    private PreferenceManager mPreferenceManager;
    @Mock
    private FragmentActivity mActivity;

    private InstrumentedPreferenceFragmentTestable mFragment;

    @Before
    public void setUp() {
        MockitoAnnotations.initMocks(this);
        when(mPreferenceManager.getPreferenceScreen()).thenReturn(mScreen);

        mFragment = spy(new InstrumentedPreferenceFragmentTestable());
        ReflectionHelpers.setField(mFragment, "mPreferenceManager", mPreferenceManager);
    }

    @Test
    public void onCreatePreferences_noPreferenceScreenResId_shouldNotAddPreference() {
        mFragment.onCreatePreferences(Bundle.EMPTY, null /* rootKey */);

        verify(mFragment, never()).addPreferencesFromResource(anyInt());
    }

    @Test
    public void onCreatePreferences_gotPreferenceScreenResId_shouldAddPreferences() {
        mFragment.setPreferenceScreenResId(R.xml.screen_pinning_settings);
        when(mFragment.getActivity()).thenReturn(mActivity);

        mFragment.onCreatePreferences(Bundle.EMPTY, null /* rootKey */);

        verify(mFragment).addPreferencesFromResource(R.xml.screen_pinning_settings);
        verify(mActivity, never()).setTitle(any());
    }

    @Test
    public void onCreatePreferences_gotPrefScreenResIdAndTitle_shouldAddPreferencesAndSetTitle() {
        mFragment.setPreferenceScreenResId(R.xml.screen_pinning_settings);
        when(mFragment.getActivity()).thenReturn(mActivity);
        final CharSequence title = "Test Title";
        when(mScreen.getTitle()).thenReturn(title);

        mFragment.onCreatePreferences(Bundle.EMPTY, null /* rootKey */);

        verify(mFragment).addPreferencesFromResource(R.xml.screen_pinning_settings);
        verify(mActivity).setTitle(title);
    }

    public static class InstrumentedPreferenceFragmentTestable
            extends InstrumentedPreferenceFragment {

        private int mScreenId = -1;

        @Override
        public int getMetricsCategory() {
            return MetricsEvent.VIEW_UNKNOWN;
        }

        @Override
        protected int getPreferenceScreenResId() {
            return mScreenId;
        }

        private void setPreferenceScreenResId(int id) {
            mScreenId = id;
        }
    }
}