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      1 /*
      2  * Copyright (C) 2009 The Guava Authors
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.common.collect.testing.google;
     18 
     19 import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
     20 import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
     21 import static com.google.common.collect.testing.features.CollectionSize.ZERO;
     22 import static java.util.Collections.nCopies;
     23 
     24 import com.google.common.annotations.GwtCompatible;
     25 import com.google.common.collect.testing.features.CollectionFeature;
     26 import com.google.common.collect.testing.features.CollectionSize;
     27 
     28 /**
     29  * A generic JUnit test which tests conditional {@code setCount()} operations on
     30  * a multiset. Can't be invoked directly; please see
     31  * {@link MultisetTestSuiteBuilder}.
     32  *
     33  * @author Chris Povirk
     34  */
     35 @GwtCompatible
     36 public class MultisetSetCountConditionallyTester<E> extends
     37     AbstractMultisetSetCountTester<E> {
     38   @Override void setCountCheckReturnValue(E element, int count) {
     39     assertTrue(
     40         "setCount() with the correct expected present count should return true",
     41         setCount(element, count));
     42   }
     43 
     44   @Override void setCountNoCheckReturnValue(E element, int count) {
     45     setCount(element, count);
     46   }
     47 
     48   private boolean setCount(E element, int count) {
     49     return getMultiset().setCount(element, getMultiset().count(element), count);
     50   }
     51 
     52   private void assertSetCountNegativeOldCount() {
     53     try {
     54       getMultiset().setCount(samples.e3, -1, 1);
     55       fail("calling setCount() with a negative oldCount should throw "
     56           + "IllegalArgumentException");
     57     } catch (IllegalArgumentException expected) {
     58     }
     59   }
     60 
     61   // Negative oldCount.
     62 
     63   @CollectionFeature.Require(SUPPORTS_ADD)
     64   public void testSetCountConditional_negativeOldCount_addSupported() {
     65     assertSetCountNegativeOldCount();
     66   }
     67 
     68   @CollectionFeature.Require(absent = SUPPORTS_ADD)
     69   public void testSetCountConditional_negativeOldCount_addUnsupported() {
     70     try {
     71       assertSetCountNegativeOldCount();
     72     } catch (UnsupportedOperationException tolerated) {
     73     }
     74   }
     75 
     76   // Incorrect expected present count.
     77 
     78   @CollectionFeature.Require(SUPPORTS_ADD)
     79   public void testSetCountConditional_oldCountTooLarge() {
     80     assertFalse("setCount() with a too-large oldCount should return false",
     81         getMultiset().setCount(samples.e0, 2, 3));
     82     expectUnchanged();
     83   }
     84 
     85   @CollectionSize.Require(absent = ZERO)
     86   @CollectionFeature.Require(SUPPORTS_ADD)
     87   public void testSetCountConditional_oldCountTooSmallZero() {
     88     assertFalse("setCount() with a too-small oldCount should return false",
     89         getMultiset().setCount(samples.e0, 0, 2));
     90     expectUnchanged();
     91   }
     92 
     93   @CollectionSize.Require(SEVERAL)
     94   @CollectionFeature.Require(SUPPORTS_ADD)
     95   public void testSetCountConditional_oldCountTooSmallNonzero() {
     96     initThreeCopies();
     97     assertFalse("setCount() with a too-small oldCount should return false",
     98         getMultiset().setCount(samples.e0, 1, 5));
     99     expectContents(nCopies(3, samples.e0));
    100   }
    101 
    102   /*
    103    * TODO: test that unmodifiable multisets either throw UOE or return false
    104    * when both are valid options. Currently we test the UOE cases and the
    105    * return-false cases but not their intersection
    106    */
    107 }
    108