src/test/java/com/google/android/libraries/feed/basicstream/internal/drivers/NoContentDriverTest.java

// Copyright 2018 The Feed Authors.
//
// 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.google.android.libraries.feed.basicstream.internal.drivers;

import static com.google.common.truth.Truth.assertThat;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.reset;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.MockitoAnnotations.initMocks;

import com.google.android.libraries.feed.basicstream.internal.viewholders.NoContentViewHolder;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.robolectric.RobolectricTestRunner;

/** Tests for {@link NoContentDriver}. */
@RunWith(RobolectricTestRunner.class)
public class NoContentDriverTest {

  @Mock private NoContentViewHolder noContentViewHolder;

  private NoContentDriver noContentDriver;

  @Before
  public void setup() {
    initMocks(this);
    noContentDriver = new NoContentDriver();
  }

  @Test
  public void testBind() {
    assertThat(noContentDriver.isBound()).isFalse();

    noContentDriver.bind(noContentViewHolder);

    assertThat(noContentDriver.isBound()).isTrue();
    verify(noContentViewHolder).bind();
  }

  @Test
  public void testUnbind() {
    noContentDriver.bind(noContentViewHolder);
    assertThat(noContentDriver.isBound()).isTrue();

    noContentDriver.unbind();

    assertThat(noContentDriver.isBound()).isFalse();
    verify(noContentViewHolder).unbind();
  }

  @Test
  public void testUnbind_doesNotCallUnbindIfNotBound() {
    assertThat(noContentDriver.isBound()).isFalse();

    noContentDriver.unbind();
    verifyNoMoreInteractions(noContentViewHolder);
  }

  @Test
  public void testMaybeRebind() {
    noContentDriver.bind(noContentViewHolder);
    assertThat(noContentDriver.isBound()).isTrue();

    noContentDriver.maybeRebind();
    assertThat(noContentDriver.isBound()).isTrue();
    verify(noContentViewHolder, times(2)).bind();
    verify(noContentViewHolder).unbind();
  }

  @Test
  public void testMaybeRebind_nullViewHolder() {
    // bind/unbind to associate the noContentViewHolder with the driver
    noContentDriver.bind(noContentViewHolder);
    noContentDriver.unbind();
    reset(noContentViewHolder);

    noContentDriver.maybeRebind();
    assertThat(noContentDriver.isBound()).isFalse();
    verify(noContentViewHolder, never()).bind();
    verify(noContentViewHolder, never()).unbind();
  }
}