/*
    * Copyright (C) 2007 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.testers;
  
  import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
  import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
  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.features.CollectionFeature;
  import com.google.common.collect.testing.features.CollectionSize;
  
  import java.lang.reflect.Method;
  
  /**
   * A generic JUnit test which tests add operations on a set. Can't be
   * invoked directly; please see
   * {@link com.google.common.collect.testing.SetTestSuiteBuilder}.
   *
   * @author Kevin Bourrillion
   */
  @GwtCompatible(emulated = true)
  public class SetAddTester<E> extends AbstractSetTester<E> {
    @CollectionFeature.Require(SUPPORTS_ADD)
    @CollectionSize.Require(absent = ZERO)
    public void testAdd_supportedPresent() {
      assertFalse("add(present) should return false", getSet().add(samples.e0));
      expectUnchanged();
    }
  
    @CollectionFeature.Require(value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES})
    @CollectionSize.Require(absent = ZERO)
    public void testAdd_supportedNullPresent() {
      E[] array = createArrayWithNullElement();
      collection = getSubjectGenerator().create(array);
      assertFalse("add(nullPresent) should return false", getSet().add(null));
      expectContents(array);
    }
  
    /**
     * Returns the {@link Method} instance for
     * {@link #testAdd_supportedNullPresent()} so that tests can suppress it. See
     * {@link CollectionAddTester#getAddNullSupportedMethod()} for details.
     */
    @GwtIncompatible("reflection")
    public static Method getAddSupportedNullPresentMethod() {
      return Helpers.getMethod(SetAddTester.class, "testAdd_supportedNullPresent");
    }
  }