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      1 /*
      2  * Copyright (C) 2013 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.ALLOWS_NULL_QUERIES;
     20 import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
     21 import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
     22 import static com.google.common.collect.testing.features.CollectionSize.ZERO;
     23 
     24 import com.google.common.annotations.GwtCompatible;
     25 import com.google.common.annotations.GwtIncompatible;
     26 import com.google.common.collect.testing.Helpers;
     27 import com.google.common.collect.testing.WrongType;
     28 import com.google.common.collect.testing.features.CollectionFeature;
     29 import com.google.common.collect.testing.features.CollectionSize;
     30 
     31 import java.lang.reflect.Method;
     32 import java.util.Arrays;
     33 import java.util.List;
     34 
     35 /**
     36  * Tests for {@code Multiset#count}.
     37  *
     38  * @author Jared Levy
     39  */
     40 @GwtCompatible(emulated = true)
     41 public class MultisetCountTester<E> extends AbstractMultisetTester<E> {
     42 
     43   public void testCount_0() {
     44     assertEquals("multiset.count(missing) didn't return 0",
     45         0, getMultiset().count(samples.e3));
     46   }
     47 
     48   @CollectionSize.Require(absent = ZERO)
     49   public void testCount_1() {
     50     assertEquals("multiset.count(present) didn't return 1",
     51         1, getMultiset().count(samples.e0));
     52   }
     53 
     54   @CollectionSize.Require(SEVERAL)
     55   public void testCount_3() {
     56     initThreeCopies();
     57     assertEquals("multiset.count(thriceContained) didn't return 3",
     58         3, getMultiset().count(samples.e0));
     59   }
     60 
     61   @CollectionFeature.Require(ALLOWS_NULL_QUERIES)
     62   public void testCount_nullAbsent() {
     63     assertEquals("multiset.count(null) didn't return 0",
     64         0, getMultiset().count(null));
     65   }
     66 
     67   @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
     68   public void testCount_null_forbidden() {
     69     try {
     70       getMultiset().count(null);
     71       fail("Expected NullPointerException");
     72     } catch (NullPointerException expected) {}
     73   }
     74 
     75   @CollectionSize.Require(absent = ZERO)
     76   @CollectionFeature.Require(ALLOWS_NULL_VALUES)
     77   public void testCount_nullPresent() {
     78     initCollectionWithNullElement();
     79     assertEquals(1, getMultiset().count(null));
     80   }
     81 
     82   public void testCount_wrongType() {
     83     assertEquals("multiset.count(wrongType) didn't return 0",
     84         0, getMultiset().count(WrongType.VALUE));
     85   }
     86 
     87   /**
     88    * Returns {@link Method} instances for the read tests that assume multisets
     89    * support duplicates so that the test of {@code Multisets.forSet()} can
     90    * suppress them.
     91    */
     92   @GwtIncompatible("reflection")
     93   public static List<Method> getCountDuplicateInitializingMethods() {
     94     return Arrays.asList(
     95         Helpers.getMethod(MultisetCountTester.class, "testCount_3"));
     96   }
     97 }
     98