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/*
* 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 android.arch.paging;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.Mockito.verifyZeroInteractions;
import android.support.annotation.NonNull;
import android.support.test.filters.SmallTest;
import android.support.v7.recyclerview.extensions.DiffCallback;
import android.support.v7.util.DiffUtil;
import android.support.v7.util.ListUpdateCallback;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.mockito.Mockito;
@SmallTest
@RunWith(JUnit4.class)
public class ContiguousDiffHelperTest {
private interface CallbackValidator {
void validate(ListUpdateCallback callback);
}
private static final DiffCallback<String> DIFF_CALLBACK = new DiffCallback<String>() {
@Override
public boolean areItemsTheSame(@NonNull String oldItem, @NonNull String newItem) {
// first char means same item
return oldItem.charAt(0) == newItem.charAt(0);
}
@Override
public boolean areContentsTheSame(@NonNull String oldItem, @NonNull String newItem) {
return oldItem.equals(newItem);
}
};
private void validateTwoListDiff(StringPagedList oldList, StringPagedList newList,
CallbackValidator callbackValidator) {
DiffUtil.DiffResult diffResult = ContiguousDiffHelper.computeDiff(oldList, newList,
DIFF_CALLBACK, false);
ListUpdateCallback listUpdateCallback = Mockito.mock(ListUpdateCallback.class);
ContiguousDiffHelper.dispatchDiff(listUpdateCallback, oldList, newList, diffResult);
callbackValidator.validate(listUpdateCallback);
}
@Test
public void sameListNoUpdates() {
validateTwoListDiff(
new StringPagedList(5, 5, "a", "b", "c"),
new StringPagedList(5, 5, "a", "b", "c"),
new CallbackValidator() {
@Override
public void validate(ListUpdateCallback callback) {
verifyZeroInteractions(callback);
}
}
);
}
@Test
public void appendFill() {
validateTwoListDiff(
new StringPagedList(5, 5, "a", "b"),
new StringPagedList(5, 4, "a", "b", "c"),
new CallbackValidator() {
@Override
public void validate(ListUpdateCallback callback) {
verify(callback).onRemoved(11, 1);
verify(callback).onInserted(7, 1);
// NOTE: ideally would be onChanged(7, 1, null)
verifyNoMoreInteractions(callback);
}
}
);
}
@Test
public void prependFill() {
validateTwoListDiff(
new StringPagedList(5, 5, "b", "c"),
new StringPagedList(4, 5, "a", "b", "c"),
new CallbackValidator() {
@Override
public void validate(ListUpdateCallback callback) {
verify(callback).onRemoved(0, 1);
verify(callback).onInserted(4, 1);
//NOTE: ideally would be onChanged(4, 1, null);
verifyNoMoreInteractions(callback);
}
}
);
}
@Test
public void change() {
validateTwoListDiff(
new StringPagedList(5, 5, "a1", "b1", "c1"),
new StringPagedList(5, 5, "a2", "b1", "c2"),
new CallbackValidator() {
@Override
public void validate(ListUpdateCallback callback) {
verify(callback).onChanged(5, 1, null);
verify(callback).onChanged(7, 1, null);
verifyNoMoreInteractions(callback);
}
}
);
}
}
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