/*
    * 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.SUPPORTS_ADD;
  import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
  import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
  import static com.google.common.collect.testing.features.CollectionSize.ZERO;
  import static com.google.common.truth.Truth.assertThat;
  
  import com.google.common.annotations.GwtCompatible;
  import com.google.common.collect.testing.features.CollectionFeature;
  import com.google.common.collect.testing.features.CollectionSize;
  
  import java.util.Collections;
  import java.util.Set;
  
  /**
   * Tests for {@code Multiset.elementSet()} not covered by the derived {@code SetTestSuiteBuilder}.
   * 
   * @author Louis Wasserman
   */
  @GwtCompatible
  public class MultisetElementSetTester<E> extends AbstractMultisetTester<E> {
    @CollectionFeature.Require(SUPPORTS_ADD)
    public void testElementSetReflectsAddAbsent() {
      Set<E> elementSet = getMultiset().elementSet();
      assertFalse(elementSet.contains(samples.e3));
      getMultiset().add(samples.e3, 4);
      assertTrue(elementSet.contains(samples.e3));
    }
    
    @CollectionSize.Require(absent = ZERO)
    @CollectionFeature.Require(SUPPORTS_REMOVE)
    public void testElementSetReflectsRemove() {
      Set<E> elementSet = getMultiset().elementSet();
      assertTrue(elementSet.contains(samples.e0));
      getMultiset().removeAll(Collections.singleton(samples.e0));
      assertFalse(elementSet.contains(samples.e0));
    }
  
    @CollectionSize.Require(absent = ZERO)
    @CollectionFeature.Require(SUPPORTS_REMOVE)
    public void testElementSetRemovePropagatesToMultiset() {
      Set<E> elementSet = getMultiset().elementSet();
      assertTrue(elementSet.remove(samples.e0));
      assertFalse(getMultiset().contains(samples.e0));
    }
  
    @CollectionSize.Require(SEVERAL)
    @CollectionFeature.Require(SUPPORTS_REMOVE)
    public void testElementSetRemoveDuplicatePropagatesToMultiset() {
      initThreeCopies();
      Set<E> elementSet = getMultiset().elementSet();
      assertTrue(elementSet.remove(samples.e0));
      assertThat(getMultiset()).isEmpty();
    }
  
    @CollectionFeature.Require(SUPPORTS_REMOVE)
    public void testElementSetRemoveAbsent() {
      Set<E> elementSet = getMultiset().elementSet();
      assertFalse(elementSet.remove(samples.e3));
      expectUnchanged();
    }
    
    @CollectionFeature.Require(SUPPORTS_REMOVE)
    public void testElementSetClear() {
      getMultiset().elementSet().clear();
      assertThat(getMultiset()).isEmpty();    
    }
  }