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/*
* Copyright (C) 2008 The Guava 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.common.collect.testing.testers;
import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.AbstractCollectionTester;
import com.google.common.collect.testing.Helpers;
import java.util.Collection;
import java.util.List;
/**
* Base class for list testers.
*
* <p>This class is GWT compatible.
*
* @author George van den Driessche
*/
@GwtCompatible
public class AbstractListTester<E> extends AbstractCollectionTester<E> {
/*
* Previously we had a field named list that was initialized to the value of
* collection in setUp(), but that caused problems when a tester changed the
* value of list or collection but not both.
*/
protected final List<E> getList() {
return (List<E>) collection;
}
/**
* {@inheritDoc}
* <p>
* The {@code AbstractListTester} implementation overrides
* {@link AbstractCollectionTester#expectContents(Collection)} to verify that
* the order of the elements in the list under test matches what is expected.
*/
@Override protected void expectContents(Collection<E> expectedCollection) {
List<E> expectedList = Helpers.copyToList(expectedCollection);
// Avoid expectEquals() here to delay reason manufacture until necessary.
if (getList().size() != expectedList.size()) {
fail("size mismatch: " + reportContext(expectedList));
}
for (int i = 0; i < expectedList.size(); i++) {
E expected = expectedList.get(i);
E actual = getList().get(i);
if (expected != actual &&
(expected == null || !expected.equals(actual))) {
fail("mismatch at index " + i + ": " + reportContext(expectedList));
}
}
}
/**
* Used to delay string formatting until actually required, as it
* otherwise shows up in the test execution profile when running an
* extremely large numbers of tests.
*/
private String reportContext(List<E> expected) {
return Platform.format("expected collection %s; actual collection %s",
expected, this.collection);
}
}
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