/*
    * Copyright (C) 2008 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.CollectionSize.ONE;
  import static com.google.common.collect.testing.features.CollectionSize.ZERO;
  
  import com.google.common.annotations.GwtCompatible;
  import com.google.common.collect.HashMultiset;
  import com.google.common.collect.Multiset;
  import com.google.common.collect.Multisets;
  import com.google.common.collect.testing.features.CollectionSize;
  
  /**
   * A generic JUnit test which tests multiset-specific read operations.
   * Can't be invoked directly; please see
   * {@link com.google.common.collect.testing.SetTestSuiteBuilder}.
   *
   * @author Jared Levy
   */
  @GwtCompatible
  public class MultisetReadsTester<E> extends AbstractMultisetTester<E> {
  
    @CollectionSize.Require(absent = ZERO)
    public void testElementSet_contains() {
      assertTrue("multiset.elementSet().contains(present) returned false",
          getMultiset().elementSet().contains(samples.e0));
    }
  
    @CollectionSize.Require(absent = ZERO)
    public void testEntrySet_contains() {
      assertTrue("multiset.entrySet() didn't contain [present, 1]",
          getMultiset().entrySet().contains(
              Multisets.immutableEntry(samples.e0, 1)));
    }
  
    public void testEntrySet_contains_count0() {
      assertFalse("multiset.entrySet() contains [missing, 0]",
          getMultiset().entrySet().contains(
              Multisets.immutableEntry(samples.e3, 0)));
    }
  
    public void testEntrySet_contains_nonentry() {
      assertFalse("multiset.entrySet() contains a non-entry",
          getMultiset().entrySet().contains(samples.e0));
    }
  
    public void testEntrySet_twice() {
      assertEquals("calling multiset.entrySet() twice returned unequal sets",
          getMultiset().entrySet(), getMultiset().entrySet());
    }
  
    @CollectionSize.Require(ZERO)
    public void testEntrySet_hashCode_size0() {
      assertEquals("multiset.entrySet() has incorrect hash code",
          0, getMultiset().entrySet().hashCode());
    }
  
    @CollectionSize.Require(ONE)
    public void testEntrySet_hashCode_size1() {
      assertEquals("multiset.entrySet() has incorrect hash code",
          1 ^ samples.e0.hashCode(), getMultiset().entrySet().hashCode());
    }
  
    public void testEquals_yes() {
      assertTrue("multiset doesn't equal a multiset with the same elements",
          getMultiset().equals(HashMultiset.create(getSampleElements())));
    }
  
    public void testEquals_differentSize() {
      Multiset<E> other = HashMultiset.create(getSampleElements());
      other.add(samples.e0);
      assertFalse("multiset equals a multiset with a different size",
          getMultiset().equals(other));
    }
  
    @CollectionSize.Require(absent = ZERO)
    public void testEquals_differentElements() {
      Multiset<E> other = HashMultiset.create(getSampleElements());
      other.remove(samples.e0);
      other.add(samples.e3);
      assertFalse("multiset equals a multiset with different elements",
          getMultiset().equals(other));
    }
  
   @CollectionSize.Require(ZERO)
   public void testHashCode_size0() {
     assertEquals("multiset has incorrect hash code",
         0, getMultiset().hashCode());
   }
 
   @CollectionSize.Require(ONE)
   public void testHashCode_size1() {
     assertEquals("multiset has incorrect hash code",
         1 ^ samples.e0.hashCode(), getMultiset().hashCode());
   }
 }