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Guava testlib is a set of java classes used for more convenient unit testing - particularly to assist the tests for Guava itself.

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/*
 * Copyright (C) 2008 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.CollectionSize.ZERO;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.AbstractCollectionTester;
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 creation (typically through a constructor or
 * static factory method) of a collection. Can't be invoked directly; please see
 * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
 *
 * This class is GWT compatible.
 *
 * @author Chris Povirk
 */
@GwtCompatible(emulated = true)
public class CollectionCreationTester extends AbstractCollectionTester {
  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
  @CollectionSize.Require(absent = ZERO)
  public void testCreateWithNull_supported() {
    E[] array = createArrayWithNullElement();
    collection = getSubjectGenerator().create(array);
    expectContents(array);
  }

  @CollectionFeature.Require(absent = ALLOWS_NULL_VALUES)
  @CollectionSize.Require(absent = ZERO)
  public void testCreateWithNull_unsupported() {
    E[] array = createArrayWithNullElement();

    try {
      getSubjectGenerator().create(array);
      fail("Creating a collection containing null should fail");
    } catch (NullPointerException expected) {
    }
  }

  /**
   * Returns the {@link Method} instance for {@link
   * #testCreateWithNull_unsupported()} so that tests can suppress it
   * with {@code FeatureSpecificTestSuiteBuilder.suppressing()} until Sun
   * bug 5045147 is fixed.
   */
  @GwtIncompatible("reflection")
  public static Method getCreateWithNullUnsupportedMethod() {
    return Helpers.getMethod(CollectionCreationTester.class, "testCreateWithNull_unsupported");
  }
}