001/*
002 * Copyright (C) 2007 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.testers;
018
019import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
020import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
021import static com.google.common.collect.testing.features.CollectionSize.ZERO;
022
023import com.google.common.annotations.GwtCompatible;
024import com.google.common.annotations.GwtIncompatible;
025import com.google.common.collect.testing.Helpers;
026import com.google.common.collect.testing.features.CollectionFeature;
027import com.google.common.collect.testing.features.CollectionSize;
028import java.lang.reflect.Method;
029
030/**
031 * A generic JUnit test which tests add operations on a set. Can't be invoked directly; please see
032 * {@link com.google.common.collect.testing.SetTestSuiteBuilder}.
033 *
034 * @author Kevin Bourrillion
035 */
036@GwtCompatible(emulated = true)
037public class SetAddTester<E> extends AbstractSetTester<E> {
038  @CollectionFeature.Require(SUPPORTS_ADD)
039  @CollectionSize.Require(absent = ZERO)
040  public void testAdd_supportedPresent() {
041    assertFalse("add(present) should return false", getSet().add(e0()));
042    expectUnchanged();
043  }
044
045  @CollectionFeature.Require(value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES})
046  @CollectionSize.Require(absent = ZERO)
047  public void testAdd_supportedNullPresent() {
048    E[] array = createArrayWithNullElement();
049    collection = getSubjectGenerator().create(array);
050    assertFalse("add(nullPresent) should return false", getSet().add(null));
051    expectContents(array);
052  }
053
054  /**
055   * Returns the {@link Method} instance for {@link #testAdd_supportedNullPresent()} so that tests
056   * can suppress it. See {@link CollectionAddTester#getAddNullSupportedMethod()} for details.
057   */
058  @GwtIncompatible // reflection
059  public static Method getAddSupportedNullPresentMethod() {
060    return Helpers.getMethod(SetAddTester.class, "testAdd_supportedNullPresent");
061  }
062}