001/*
002 * Copyright (C) 2009 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.google;
018
019import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
020import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
021import static com.google.common.collect.testing.features.CollectionSize.ZERO;
022import static java.util.Collections.nCopies;
023
024import com.google.common.annotations.GwtCompatible;
025import com.google.common.collect.testing.features.CollectionFeature;
026import com.google.common.collect.testing.features.CollectionSize;
027
028/**
029 * A generic JUnit test which tests conditional {@code setCount()} operations on a multiset. Can't
030 * be invoked directly; please see {@link MultisetTestSuiteBuilder}.
031 *
032 * @author Chris Povirk
033 */
034@GwtCompatible
035public class MultisetSetCountConditionallyTester<E> extends AbstractMultisetSetCountTester<E> {
036  @Override
037  void setCountCheckReturnValue(E element, int count) {
038    assertTrue(
039        "setCount() with the correct expected present count should return true",
040        setCount(element, count));
041  }
042
043  @Override
044  void setCountNoCheckReturnValue(E element, int count) {
045    setCount(element, count);
046  }
047
048  private boolean setCount(E element, int count) {
049    return getMultiset().setCount(element, getMultiset().count(element), count);
050  }
051
052  private void assertSetCountNegativeOldCount() {
053    try {
054      getMultiset().setCount(e3(), -1, 1);
055      fail("calling setCount() with a negative oldCount should throw IllegalArgumentException");
056    } catch (IllegalArgumentException expected) {
057    }
058  }
059
060  // Negative oldCount.
061
062  @CollectionFeature.Require(SUPPORTS_ADD)
063  public void testSetCountConditional_negativeOldCount_addSupported() {
064    assertSetCountNegativeOldCount();
065  }
066
067  @CollectionFeature.Require(absent = SUPPORTS_ADD)
068  public void testSetCountConditional_negativeOldCount_addUnsupported() {
069    try {
070      assertSetCountNegativeOldCount();
071    } catch (UnsupportedOperationException tolerated) {
072    }
073  }
074
075  // Incorrect expected present count.
076
077  @CollectionFeature.Require(SUPPORTS_ADD)
078  public void testSetCountConditional_oldCountTooLarge() {
079    assertFalse(
080        "setCount() with a too-large oldCount should return false",
081        getMultiset().setCount(e0(), 2, 3));
082    expectUnchanged();
083  }
084
085  @CollectionSize.Require(absent = ZERO)
086  @CollectionFeature.Require(SUPPORTS_ADD)
087  public void testSetCountConditional_oldCountTooSmallZero() {
088    assertFalse(
089        "setCount() with a too-small oldCount should return false",
090        getMultiset().setCount(e0(), 0, 2));
091    expectUnchanged();
092  }
093
094  @CollectionSize.Require(SEVERAL)
095  @CollectionFeature.Require(SUPPORTS_ADD)
096  public void testSetCountConditional_oldCountTooSmallNonzero() {
097    initThreeCopies();
098    assertFalse(
099        "setCount() with a too-small oldCount should return false",
100        getMultiset().setCount(e0(), 1, 5));
101    expectContents(nCopies(3, e0()));
102  }
103
104  /*
105   * TODO: test that unmodifiable multisets either throw UOE or return false
106   * when both are valid options. Currently we test the UOE cases and the
107   * return-false cases but not their intersection
108   */
109}