content: /*
   * Copyright (C) 2015 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 androidx.test.espresso.base;
  
  import static androidx.test.platform.app.InstrumentationRegistry.getInstrumentation;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.notNullValue;
  import static org.hamcrest.Matchers.nullValue;
  import static org.hamcrest.Matchers.sameInstance;
  import static org.junit.rules.ExpectedException.none;
  
  import android.content.Context;
  import android.view.View;
  import android.widget.RelativeLayout;
  import android.widget.TextView;
  import androidx.test.annotation.UiThreadTest;
  import androidx.test.espresso.AmbiguousViewMatcherException;
  import androidx.test.espresso.NoMatchingViewException;
  import androidx.test.espresso.ViewFinder;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import androidx.test.filters.MediumTest;
  import javax.inject.Provider;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  
  /** Unit tests for {@link ViewFinderImpl}. */
  @MediumTest
  @RunWith(AndroidJUnit4.class)
  public class ViewFinderImplTest {
  
    private Provider<View> testViewProvider;
    private RelativeLayout testView;
    private View child1;
    private View child2;
    private View child3;
    private View child4;
    private View nestedChild;
    private Context mTargetContext;
  
    @Rule public ExpectedException expectedException = none();
  
    @Before
    public void setUp() throws Exception {
      mTargetContext = getInstrumentation().getTargetContext();
      testView = new RelativeLayout(mTargetContext);
      child1 = new TextView(mTargetContext);
      child1.setId(1);
      child2 = new TextView(mTargetContext);
      child2.setId(2);
      child3 = new TextView(mTargetContext);
      child3.setId(3);
      child4 = new TextView(mTargetContext);
      child4.setId(4);
      nestedChild = new TextView(mTargetContext);
      nestedChild.setId(5);
      RelativeLayout nestingLayout = new RelativeLayout(mTargetContext);
      nestingLayout.addView(nestedChild);
      testView.addView(child1);
      testView.addView(child2);
      testView.addView(nestingLayout);
      testView.addView(child3);
      testView.addView(child4);
      testViewProvider =
          new Provider<View>() {
            @Override
            public View get() {
              return testView;
            }
  
            @Override
            public String toString() {
              return "of(" + testView + ")";
            }
          };
    }
  
    @Test
    @UiThreadTest
    public void getViewPresent() {
      ViewFinder finder = new ViewFinderImpl(sameInstance(nestedChild), testViewProvider);
      assertThat(finder.getView(), sameInstance(nestedChild));
    }
  
    @Test
    @UiThreadTest
    public void getView_missing() {
      ViewFinder finder = new ViewFinderImpl(nullValue(View.class), testViewProvider);
      expectedException.expect(NoMatchingViewException.class);
      finder.getView();
    }
  
    @Test
    @UiThreadTest
    public void getView_multiple() {
      ViewFinder finder = new ViewFinderImpl(notNullValue(View.class), testViewProvider);
      expectedException.expect(AmbiguousViewMatcherException.class);
      finder.getView();
    }
  
    @Test
    public void find_offUiThread() {
      ViewFinder finder = new ViewFinderImpl(sameInstance(nestedChild), testViewProvider);
      expectedException.expect(IllegalStateException.class);
      finder.getView();
    }
  }
  