/*
    * Copyright (C) 2012 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.ZERO;
  import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
  import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEY_QUERIES;
  
  import com.google.common.annotations.GwtCompatible;
  import com.google.common.collect.Multimap;
  import com.google.common.collect.testing.features.CollectionSize;
  import com.google.common.collect.testing.features.MapFeature;
  
  /**
   * Tester for the {@code containsKey} methods of {@code Multimap} and its {@code asMap()} view.
   *
   * @author Louis Wasserman
   */
  @GwtCompatible
  public class MultimapContainsKeyTester<K, V>
      extends AbstractMultimapTester<K, V, Multimap<K, V>> {
    @CollectionSize.Require(absent = ZERO)
    public void testContainsKeyYes() {
      assertTrue(multimap().containsKey(sampleKeys().e0));
    }
  
    public void testContainsKeyNo() {
      assertFalse(multimap().containsKey(sampleKeys().e3));
    }
  
    public void testContainsKeysFromKeySet() {
      for (K k : multimap().keySet()) {
        assertTrue(multimap().containsKey(k));
      }
    }
  
    public void testContainsKeyAgreesWithGet() {
      for (K k : sampleKeys()) {
        assertEquals(!multimap().get(k).isEmpty(), multimap().containsKey(k));
      }
    }
  
    public void testContainsKeyAgreesWithAsMap() {
      for (K k : sampleKeys()) {
        assertEquals(multimap().containsKey(k), multimap().asMap().containsKey(k));
      }
    }
  
    public void testContainsKeyAgreesWithKeySet() {
      for (K k : sampleKeys()) {
        assertEquals(multimap().containsKey(k), multimap().keySet().contains(k));
      }
    }
  
    @MapFeature.Require(ALLOWS_NULL_KEYS)
    @CollectionSize.Require(absent = ZERO)
    public void testContainsKeyNullPresent() {
      initMultimapWithNullKey();
      assertTrue(multimap().containsKey(null));
    }
  
    @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
    public void testContainsKeyNullAbsent() {
      assertFalse(multimap().containsKey(null));
    }
  
    @MapFeature.Require(absent = ALLOWS_NULL_KEY_QUERIES)
    public void testContainsKeyNullDisallowed() {
      try {
        multimap().containsKey(null);
        fail("Expected NullPointerException");
      } catch (NullPointerException expected) {
        // success
      }
    }
  }