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Guava testlib is a set of java classes used for more convenient unit testing - particularly to assist the tests for Guava itself.

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/*
 * Copyright (C) 2007 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 static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.WrongType;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;

/**
 * Common parent class for {@link ListIndexOfTester} and
 * {@link ListLastIndexOfTester}.
 *
 * This class is GWT compatible.
 *
 * @author Chris Povirk
 */
@GwtCompatible
public abstract class AbstractListIndexOfTester
    extends AbstractListTester {
  /** Override to call {@code indexOf()} or {@code lastIndexOf()}. */
  protected abstract int find(Object o);

  /**
   * Override to return "indexOf" or "lastIndexOf()" for use in failure
   * messages.
   */
  protected abstract String getMethodName();

  @CollectionSize.Require(absent = ZERO)
  public void testFind_yes() {
    assertEquals(getMethodName() + "(firstElement) should return 0",
        0, find(getOrderedElements().get(0)));
  }

  public void testFind_no() {
    assertEquals(getMethodName() + "(notPresent) should return -1",
        -1, find(samples.e3));
  }

  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
  public void testFind_nullNotContainedButSupported() {
    assertEquals(getMethodName() + "(nullNotPresent) should return -1",
        -1, find(null));
  }

  @CollectionFeature.Require(absent = ALLOWS_NULL_VALUES)
  public void testFind_nullNotContainedAndUnsupported() {
    try {
      assertEquals(
          getMethodName() + "(nullNotPresent) should return -1 or throw",
          -1, find(null));
    } catch (NullPointerException tolerated) {
    }
  }

  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
  @CollectionSize.Require(absent = ZERO)
  public void testFind_nonNullWhenNullContained() {
    initCollectionWithNullElement();
    assertEquals(getMethodName() + "(notPresent) should return -1",
        -1, find(samples.e3));
  }

  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
  @CollectionSize.Require(absent = ZERO)
  public void testFind_nullContained() {
    initCollectionWithNullElement();
    assertEquals(getMethodName() + "(null) should return " + getNullLocation(),
        getNullLocation(), find(null));
  }

  public void testFind_wrongType() {
    try {
      assertEquals(getMethodName() + "(wrongType) should return -1 or throw",
          -1, find(WrongType.VALUE));
    } catch (ClassCastException tolerated) {
    }
  }
}