001/*
002 * Copyright (C) 2008 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.Helpers.getMethod;
020import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
021import static com.google.common.collect.testing.features.CollectionSize.ZERO;
022import static org.junit.Assert.assertThrows;
023
024import com.google.common.annotations.GwtCompatible;
025import com.google.common.annotations.GwtIncompatible;
026import com.google.common.annotations.J2ktIncompatible;
027import com.google.common.collect.testing.AbstractCollectionTester;
028import com.google.common.collect.testing.features.CollectionFeature;
029import com.google.common.collect.testing.features.CollectionSize;
030import java.lang.reflect.Method;
031
032/**
033 * A generic JUnit test which tests creation (typically through a constructor or static factory
034 * method) of a collection. Can't be invoked directly; please see {@link
035 * com.google.common.collect.testing.CollectionTestSuiteBuilder}.
036 *
037 * @author Chris Povirk
038 */
039@GwtCompatible
040public class CollectionCreationTester<E> extends AbstractCollectionTester<E> {
041  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
042  @CollectionSize.Require(absent = ZERO)
043  public void testCreateWithNull_supported() {
044    E[] array = createArrayWithNullElement();
045    collection = getSubjectGenerator().create(array);
046    expectContents(array);
047  }
048
049  @CollectionFeature.Require(absent = ALLOWS_NULL_VALUES)
050  @CollectionSize.Require(absent = ZERO)
051  public void testCreateWithNull_unsupported() {
052    E[] array = createArrayWithNullElement();
053
054    assertThrows(
055        NullPointerException.class,
056        () -> {
057          Object unused = getSubjectGenerator().create(array);
058        });
059  }
060
061  /**
062   * Returns the {@link Method} instance for {@link #testCreateWithNull_unsupported()} so that tests
063   * can suppress it with {@code FeatureSpecificTestSuiteBuilder.suppressing()} until <a
064   * href="https://bugs.openjdk.org/browse/JDK-5045147">JDK-5045147</a> is fixed.
065   */
066  @J2ktIncompatible
067  @GwtIncompatible // reflection
068  public static Method getCreateWithNullUnsupportedMethod() {
069    return getMethod(CollectionCreationTester.class, "testCreateWithNull_unsupported");
070  }
071}