content: /*
   * Copyright 2016, 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.example.android.testing.espresso.IdlingResourceSample;
  
  import static androidx.test.espresso.Espresso.onView;
  import static androidx.test.espresso.action.ViewActions.click;
  import static androidx.test.espresso.action.ViewActions.closeSoftKeyboard;
  import static androidx.test.espresso.action.ViewActions.typeText;
  import static androidx.test.espresso.assertion.ViewAssertions.matches;
  import static androidx.test.espresso.matcher.ViewMatchers.withId;
  import static androidx.test.espresso.matcher.ViewMatchers.withText;
  
  import androidx.test.core.app.ActivityScenario;
  import androidx.test.espresso.IdlingRegistry;
  import androidx.test.espresso.IdlingResource;
  import androidx.test.filters.LargeTest;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  
  /**
   * Same as Espresso's BasicSample, but with an Idling Resource to help with synchronization.
   */
  @RunWith(AndroidJUnit4.class)
  @LargeTest
  public class ChangeTextBehaviorTest {
  
      private static final String STRING_TO_BE_TYPED = "Espresso";
  
      private IdlingResource mIdlingResource;
  
  
      /**
       * Use {@link ActivityScenario to launch and get access to the activity.
       * {@link ActivityScenario#onActivity(ActivityScenario.ActivityAction)} provides a thread-safe
       * mechanism to access the activity.
       */
      @Before
      public void registerIdlingResource() {
          ActivityScenario activityScenario = ActivityScenario.launch(MainActivity.class);
          activityScenario.onActivity(new ActivityScenario.ActivityAction<MainActivity>() {
              @Override
              public void perform(MainActivity activity) {
                  mIdlingResource = activity.getIdlingResource();
                  // To prove that the test fails, omit this call:
                  IdlingRegistry.getInstance().register(mIdlingResource);
              }
          });
      }
  
      @Test
      public void changeText_sameActivity() {
          // Type text and then press the button.
          onView(withId(R.id.editTextUserInput))
                  .perform(typeText(STRING_TO_BE_TYPED), closeSoftKeyboard());
          onView(withId(R.id.changeTextBt)).perform(click());
  
          // Check that the text was changed.
          onView(withId(R.id.textToBeChanged)).check(matches(withText(STRING_TO_BE_TYPED)));
      }
  
      @After
      public void unregisterIdlingResource() {
          if (mIdlingResource != null) {
              IdlingRegistry.getInstance().unregister(mIdlingResource);
          }
      }
  }