/*
    * Copyright (C) 2013 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.google;
  
  import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_QUERIES;
  import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
  import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
  import static com.google.common.collect.testing.features.CollectionSize.ZERO;
  
  import com.google.common.annotations.GwtCompatible;
  import com.google.common.annotations.GwtIncompatible;
  import com.google.common.collect.testing.Helpers;
  import com.google.common.collect.testing.WrongType;
  import com.google.common.collect.testing.features.CollectionFeature;
  import com.google.common.collect.testing.features.CollectionSize;
  
  import java.lang.reflect.Method;
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * Tests for {@code Multiset#count}.
   *
   * @author Jared Levy
   */
  @GwtCompatible(emulated = true)
  public class MultisetCountTester<E> extends AbstractMultisetTester<E> {
  
    public void testCount_0() {
      assertEquals("multiset.count(missing) didn't return 0",
          0, getMultiset().count(samples.e3));
    }
  
    @CollectionSize.Require(absent = ZERO)
    public void testCount_1() {
      assertEquals("multiset.count(present) didn't return 1",
          1, getMultiset().count(samples.e0));
    }
  
    @CollectionSize.Require(SEVERAL)
    public void testCount_3() {
      initThreeCopies();
      assertEquals("multiset.count(thriceContained) didn't return 3",
          3, getMultiset().count(samples.e0));
    }
  
    @CollectionFeature.Require(ALLOWS_NULL_QUERIES)
    public void testCount_nullAbsent() {
      assertEquals("multiset.count(null) didn't return 0",
          0, getMultiset().count(null));
    }
  
    @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
    public void testCount_null_forbidden() {
      try {
        getMultiset().count(null);
        fail("Expected NullPointerException");
      } catch (NullPointerException expected) {}
    }
    
    @CollectionSize.Require(absent = ZERO)
    @CollectionFeature.Require(ALLOWS_NULL_VALUES)
    public void testCount_nullPresent() {
      initCollectionWithNullElement();
      assertEquals(1, getMultiset().count(null));
    }
  
    public void testCount_wrongType() {
      assertEquals("multiset.count(wrongType) didn't return 0",
          0, getMultiset().count(WrongType.VALUE));
    }
  
    /**
     * Returns {@link Method} instances for the read tests that assume multisets
     * support duplicates so that the test of {@code Multisets.forSet()} can
     * suppress them.
     */
    @GwtIncompatible("reflection")
    public static List<Method> getCountDuplicateInitializingMethods() {
      return Arrays.asList(
          Helpers.getMethod(MultisetCountTester.class, "testCount_3"));
    }
  }