tests/app/src/com/android/settings/DisplaySettingsTest.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;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.click;
import static android.support.test.espresso.matcher.ViewMatchers.withText;

import android.app.Instrumentation;
import android.content.Context;
import android.content.Intent;
import android.support.test.InstrumentationRegistry;
import android.support.test.filters.SmallTest;
import android.support.test.runner.AndroidJUnit4;
import android.support.test.uiautomator.UiDevice;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

@RunWith(AndroidJUnit4.class)
@SmallTest
public class DisplaySettingsTest {

    private Instrumentation mInstrumentation;
    private Context mContext;
    private UiDevice mDevice;

    @Before
    public void setUp() {
        mInstrumentation = InstrumentationRegistry.getInstrumentation();
        mContext = mInstrumentation.getTargetContext();
        mDevice = UiDevice.getInstance(mInstrumentation);
    }

    @Test
    public void launchBrightnessLevel_shouldNotCrash() {
        mInstrumentation.startActivitySync(
                new Intent(mContext, DisplaySettings.class));
        onView(withText(mContext.getString(R.string.brightness))).perform(click());
        // should not crash
        mDevice.pressBack(); // dismiss the brightness dialog
    }
}