/*
    * 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 com.google.common.annotations.GwtCompatible;
  import com.google.common.collect.testing.features.CollectionFeature;
  
  import java.util.Arrays;
  import java.util.Collections;
  
  /**
   * Tests for {@code Multiset.add}.
   * 
   * @author Jared Levy
   */
  @GwtCompatible
  public class MultisetAddTester<E> extends AbstractMultisetTester<E> {
    @CollectionFeature.Require(absent = SUPPORTS_ADD)
    public void testAddUnsupported() {
      try {
        getMultiset().add(samples.e0);
        fail("Expected UnsupportedOperationException");
      } catch (UnsupportedOperationException expected) {}
    }
    
    @CollectionFeature.Require(SUPPORTS_ADD)
    public void testAddMeansAddOne() {
      int originalCount = getMultiset().count(samples.e0);
      assertTrue(getMultiset().add(samples.e0));
      assertEquals(originalCount + 1, getMultiset().count(samples.e0));
    }
    
    @CollectionFeature.Require(SUPPORTS_ADD)
    public void testAddOccurrencesZero() {
      int originalCount = getMultiset().count(samples.e0);
      assertEquals("old count", originalCount, getMultiset().add(samples.e0, 0));
      expectUnchanged();
    }
  
    @CollectionFeature.Require(SUPPORTS_ADD)
    public void testAddOccurrences() {
      int originalCount = getMultiset().count(samples.e0);
      assertEquals("old count", originalCount, getMultiset().add(samples.e0, 2));
      assertEquals("old count", originalCount + 2, getMultiset().count(samples.e0));
    }
    
    @CollectionFeature.Require(SUPPORTS_ADD)
    public void testAddSeveralTimes() {
      int originalCount = getMultiset().count(samples.e0);
      assertEquals(originalCount, getMultiset().add(samples.e0, 2));
      assertTrue(getMultiset().add(samples.e0));
      assertEquals(originalCount + 3, getMultiset().add(samples.e0, 1));
      assertEquals(originalCount + 4, getMultiset().count(samples.e0));
    }
  
    @CollectionFeature.Require(absent = SUPPORTS_ADD)
    public void testAddOccurrences_unsupported() {
      try {
        getMultiset().add(samples.e0, 2);
        fail("unsupported multiset.add(E, int) didn't throw exception");
      } catch (UnsupportedOperationException required) {}
    }
  
    @CollectionFeature.Require(SUPPORTS_ADD)
    public void testAddOccurrencesNegative() {
      try {
        getMultiset().add(samples.e0, -1);
        fail("multiset.add(E, -1) didn't throw an exception");
      } catch (IllegalArgumentException required) {}
    }
  
    @CollectionFeature.Require(SUPPORTS_ADD)
    public void testAddTooMany() {
      getMultiset().add(samples.e3, Integer.MAX_VALUE);
      try {
        getMultiset().add(samples.e3);
        fail();
      } catch (IllegalArgumentException expected) {}
      assertEquals(Integer.MAX_VALUE, getMultiset().count(samples.e3));
      assertEquals(Integer.MAX_VALUE, getMultiset().size());
    }
    
    @CollectionFeature.Require(SUPPORTS_ADD)
   public void testAddAll_emptySet() {
     assertFalse(getMultiset().addAll(Collections.<E>emptySet()));
     expectUnchanged();
   }
   
   @CollectionFeature.Require(SUPPORTS_ADD)
   public void testAddAll_emptyMultiset() {
     assertFalse(getMultiset().addAll(getSubjectGenerator().create()));
     expectUnchanged();
   }
   
   @CollectionFeature.Require(SUPPORTS_ADD)
   public void testAddAll_nonEmptyList() {
     assertTrue(getMultiset().addAll(Arrays.asList(samples.e3, samples.e4, samples.e3)));
     expectAdded(samples.e3, samples.e4, samples.e3);
   }
   
   @CollectionFeature.Require(SUPPORTS_ADD)
   public void testAddAll_nonEmptyMultiset() {
     assertTrue(getMultiset().addAll(
         getSubjectGenerator().create(samples.e3, samples.e4, samples.e3)));
     expectAdded(samples.e3, samples.e4, samples.e3);
   }
 }