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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.CollectionFeature.REJECTS_DUPLICATES_AT_CREATION;
import static com.google.common.collect.testing.features.CollectionSize.ONE;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;

import java.util.Arrays;
import java.util.List;

/**
 * A generic JUnit test which tests creation (typically through a constructor or
 * static factory method) of a set. Can't be invoked directly; please see
 * {@link com.google.common.collect.testing.SetTestSuiteBuilder}.
 *
 * @author Chris Povirk
 */
@GwtCompatible
public class SetCreationTester extends AbstractSetTester {
  @CollectionFeature.Require(value = ALLOWS_NULL_VALUES,
      absent = REJECTS_DUPLICATES_AT_CREATION)
  @CollectionSize.Require(absent = {ZERO, ONE})
  public void testCreateWithDuplicates_nullDuplicatesNotRejected() {
    E[] array = createArrayWithNullElement();
    array[0] = null;
    collection = getSubjectGenerator().create(array);

    List expectedWithDuplicateRemoved =
        Arrays.asList(array).subList(1, getNumElements());
    expectContents(expectedWithDuplicateRemoved);
  }

  @CollectionFeature.Require(absent = REJECTS_DUPLICATES_AT_CREATION)
  @CollectionSize.Require(absent = {ZERO, ONE})
  public void testCreateWithDuplicates_nonNullDuplicatesNotRejected() {
    E[] array = createSamplesArray();
    array[1] = samples.e0;
    collection = getSubjectGenerator().create(array);

    List expectedWithDuplicateRemoved =
        Arrays.asList(array).subList(1, getNumElements());
    expectContents(expectedWithDuplicateRemoved);
  }

  @CollectionFeature.Require(
      {ALLOWS_NULL_VALUES, REJECTS_DUPLICATES_AT_CREATION})
  @CollectionSize.Require(absent = {ZERO, ONE})
  public void testCreateWithDuplicates_nullDuplicatesRejected() {
    E[] array = createArrayWithNullElement();
    array[0] = null;
    try {
      collection = getSubjectGenerator().create(array);
      fail("Should reject duplicate null elements at creation");
    } catch (IllegalArgumentException expected) {
    }
  }

  @CollectionFeature.Require(REJECTS_DUPLICATES_AT_CREATION)
  @CollectionSize.Require(absent = {ZERO, ONE})
  public void testCreateWithDuplicates_nonNullDuplicatesRejected() {
    E[] array = createSamplesArray();
    array[1] = samples.e0;
    try {
      collection = getSubjectGenerator().create(array);
      fail("Should reject duplicate non-null elements at creation");
    } catch (IllegalArgumentException expected) {
    }
  }
}