Create Espresso test class for WifiSettings.

/*

 * 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.wifi;

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.rule.ActivityTestRule;

import android.support.test.runner.AndroidJUnit4;

import com.android.settings.R;

import com.android.settings.Settings.WifiSettingsActivity;

import com.android.settingslib.wifi.WifiTracker;

import com.android.settingslib.wifi.WifiTrackerFactory;

import org.junit.Before;

import org.junit.Rule;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.Mock;

import org.mockito.MockitoAnnotations;

@RunWith(AndroidJUnit4.class)

public class WifiSettingsUiTest {

    // TODO(sghuman): Investigate why resource ids are not resolving correctly in the test apk,

    // then remove this manual string entry

    private static final String WIFI_PREFERENCES = "Wi\\u2011Fi preferences";

    @Mock private WifiTracker mockWifiTracker;

    @Rule

    public ActivityTestRule<WifiSettingsActivity> mActivityRule =

            new ActivityTestRule<>(WifiSettingsActivity.class, true);

    @Before

    public void setUp() {

        MockitoAnnotations.initMocks(this);

        WifiTrackerFactory.setTestingWifiTracker(mockWifiTracker);

    }

    private void launchActivity() {

        mActivityRule.launchActivity(new Intent("android.settings.WIFI_SETTINGS"));

    }

    @Test

    public void launchActivityShouldSucceed() {

        launchActivity();

    }

    @Test

    public void shouldShowWifiPreferences() {

        launchActivity();

        onView(withText(WIFI_PREFERENCES)).perform(click());

    }

}