src/test/java/com/google/android/libraries/feed/infraintegration/ContentRemoveTest.java

// Copyright 2019 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.infraintegration;

import static com.google.android.libraries.feed.common.testing.ResponseBuilder.ROOT_CONTENT_ID;
import static com.google.common.truth.Truth.assertThat;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;

import com.google.android.libraries.feed.api.common.MutationContext;
import com.google.android.libraries.feed.api.host.logging.RequestReason;
import com.google.android.libraries.feed.api.internal.modelprovider.FeatureChange;
import com.google.android.libraries.feed.api.internal.modelprovider.FeatureChangeObserver;
import com.google.android.libraries.feed.api.internal.modelprovider.ModelCursor;
import com.google.android.libraries.feed.api.internal.modelprovider.ModelFeature;
import com.google.android.libraries.feed.api.internal.modelprovider.ModelProvider;
import com.google.android.libraries.feed.api.internal.modelprovider.ModelProviderFactory;
import com.google.android.libraries.feed.api.sessionmanager.SessionManager;
import com.google.android.libraries.feed.common.concurrent.testing.FakeThreadUtils;
import com.google.android.libraries.feed.common.testing.InfraIntegrationScope;
import com.google.android.libraries.feed.common.testing.ModelProviderValidator;
import com.google.android.libraries.feed.common.testing.ResponseBuilder;
import com.google.android.libraries.feed.testing.requestmanager.FakeFeedRequestManager;
import com.google.search.now.feed.client.StreamDataProto.StreamToken;
import com.google.search.now.feed.client.StreamDataProto.UiContext;
import com.google.search.now.wire.feed.ConsistencyTokenProto.ConsistencyToken;
import com.google.search.now.wire.feed.ContentIdProto.ContentId;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.robolectric.RobolectricTestRunner;

/** Tests which remove content within an existing model. */
@RunWith(RobolectricTestRunner.class)
public class ContentRemoveTest {
  private final InfraIntegrationScope scope = new InfraIntegrationScope.Builder().build();
  private final FakeFeedRequestManager fakeFeedRequestManager = scope.getFakeFeedRequestManager();
  private final FakeThreadUtils fakeThreadUtils = scope.getFakeThreadUtils();
  private final SessionManager sessionManager = scope.getFeedSessionManager();
  private final ModelProviderFactory modelProviderFactory = scope.getModelProviderFactory();
  private final ModelProviderValidator modelValidator =
      new ModelProviderValidator(scope.getProtocolAdapter());

  @Test
  public void removeContent() {
    // Create a simple stream with a root and four features
    ContentId[] cards =
        new ContentId[] {
          ResponseBuilder.createFeatureContentId(1),
          ResponseBuilder.createFeatureContentId(2),
          ResponseBuilder.createFeatureContentId(3),
          ResponseBuilder.createFeatureContentId(4)
        };
    fakeFeedRequestManager.queueResponse(ResponseBuilder.forClearAllWithCards(cards).build());
    fakeFeedRequestManager.triggerRefresh(
        RequestReason.OPEN_WITHOUT_CONTENT,
        sessionManager.getUpdateConsumer(MutationContext.EMPTY_CONTEXT));

    ModelProvider modelProvider =
        modelProviderFactory.createNew(null, UiContext.getDefaultInstance());
    assertThat(modelProvider.getRootFeature()).isNotNull();
    ModelFeature rootFeature = modelProvider.getRootFeature();
    FeatureChangeObserver observer = mock(FeatureChangeObserver.class);
    rootFeature.registerObserver(observer);
    modelValidator.assertCursorSize(rootFeature.getCursor(), cards.length);

    // Create cursor advanced to each spot in the list of children
    ModelCursor advancedCursor0 = rootFeature.getCursor();
    ModelCursor advancedCursor1 = advanceCursor(rootFeature.getCursor(), 1);
    ModelCursor advancedCursor2 = advanceCursor(rootFeature.getCursor(), 2);
    ModelCursor advancedCursor3 = advanceCursor(rootFeature.getCursor(), 3);
    ModelCursor advancedCursor4 = advanceCursor(rootFeature.getCursor(), 4);

    fakeFeedRequestManager.queueResponse(
        ResponseBuilder.builder().removeFeature(cards[1], ROOT_CONTENT_ID).build());
    // TODO: sessions reject removes without a CLEAR_ALL or paging with a different token.
    fakeThreadUtils.enforceMainThread(false);
    fakeFeedRequestManager.loadMore(
        StreamToken.getDefaultInstance(),
        ConsistencyToken.getDefaultInstance(),
        sessionManager.getUpdateConsumer(MutationContext.EMPTY_CONTEXT));

    ArgumentCaptor<FeatureChange> capture = ArgumentCaptor.forClass(FeatureChange.class);
    verify(observer).onChange(capture.capture());
    List<FeatureChange> featureChanges = capture.getAllValues();
    assertThat(featureChanges).hasSize(1);
    FeatureChange change = featureChanges.get(0);
    assertThat(change.getChildChanges().getRemovedChildren()).hasSize(1);

    modelValidator.assertCursorContents(advancedCursor0, cards[0], cards[2], cards[3]);
    modelValidator.assertCursorContents(advancedCursor1, cards[2], cards[3]);
    modelValidator.assertCursorContents(advancedCursor2, cards[2], cards[3]);
    modelValidator.assertCursorContents(advancedCursor3, cards[3]);
    modelValidator.assertCursorContents(advancedCursor4);

    // create a cursor after the remove to verify $HEAD was modified
    ModelCursor cursor = rootFeature.getCursor();
    modelValidator.assertCursorContents(cursor, cards[0], cards[2], cards[3]);
  }

  private ModelCursor advanceCursor(ModelCursor cursor, int count) {
    for (int i = 0; i < count; i++) {
      cursor.getNextItem();
    }
    return cursor;
  }
}