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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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
Base class for list testers.

George van den Driessche
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>) ;


The AbstractListTester implementation overrides 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",
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