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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) 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.FAILS_FAST_ON_CONCURRENT_MODIFICATION;
import static com.google.common.collect.testing.features.CollectionFeature.RESTRICTS_ELEMENTS;
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.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;
import java.util.ConcurrentModificationException;
import java.util.Iterator;

/**
 * A generic JUnit test which tests {@code add} operations on a collection.
 * Can't be invoked directly; please see
 * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
 *
 * This class is GWT compatible.
 *
 * @author Chris Povirk
 * @author Kevin Bourrillion
 */
@SuppressWarnings("unchecked") // too many "unchecked generic array creations"
@GwtCompatible(emulated = true)
public class CollectionAddTester extends AbstractCollectionTester {
  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testAdd_supportedNotPresent() {
    assertTrue("add(notPresent) should return true",
        collection.add(samples.e3));
    expectAdded(samples.e3);
  }

  @CollectionFeature.Require(absent = SUPPORTS_ADD)
  public void testAdd_unsupportedNotPresent() {
    try {
      collection.add(samples.e3);
      fail("add(notPresent) should throw");
    } catch (UnsupportedOperationException expected) {
    }
    expectUnchanged();
    expectMissing(samples.e3);
  }

  @CollectionFeature.Require(absent = SUPPORTS_ADD)
  @CollectionSize.Require(absent = ZERO)
  public void testAdd_unsupportedPresent() {
    try {
      assertFalse("add(present) should return false or throw",
          collection.add(samples.e0));
    } catch (UnsupportedOperationException tolerated) {
    }
    expectUnchanged();
  }

  @CollectionFeature.Require(
      value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES},
      absent = RESTRICTS_ELEMENTS)
  public void testAdd_nullSupported() {
    assertTrue("add(null) should return true", collection.add(null));
    expectAdded((E) null);
  }

  @CollectionFeature.Require(value = SUPPORTS_ADD,
      absent = ALLOWS_NULL_VALUES)
  public void testAdd_nullUnsupported() {
    try {
      collection.add(null);
      fail("add(null) should throw");
    } catch (NullPointerException expected) {
    }
    expectUnchanged();
    expectNullMissingWhenNullUnsupported(
        "Should not contain null after unsupported add(null)");
  }

  @CollectionFeature.Require({SUPPORTS_ADD,
      FAILS_FAST_ON_CONCURRENT_MODIFICATION})
  @CollectionSize.Require(absent = ZERO)
  public void testAddConcurrentWithIteration() {
    try {
      Iterator iterator = collection.iterator();
      assertTrue(collection.add(samples.e3));
      iterator.next();
      fail("Expected ConcurrentModificationException");
    } catch (ConcurrentModificationException expected) {
      // success
    }
  }

  /**
   * Returns the {@link Method} instance for {@link #testAdd_nullSupported()} so
   * that tests of {@link
   * java.util.Collections#checkedCollection(java.util.Collection, Class)} can
   * suppress it with {@code FeatureSpecificTestSuiteBuilder.suppressing()}
   * until Sun bug
   * 6409434 is fixed. It's unclear whether nulls were to be permitted or
   * forbidden, but presumably the eventual fix will be to permit them, as it
   * seems more likely that code would depend on that behavior than on the
   * other. Thus, we say the bug is in add(), which fails to support null.
   */
  @GwtIncompatible("reflection")
  public static Method getAddNullSupportedMethod() {
    return Helpers.getMethod(CollectionAddTester.class, "testAdd_nullSupported");
  }

  /**
   * Returns the {@link Method} instance for {@link #testAdd_nullSupported()}
   * so that tests of {@link java.util.TreeSet} can suppress it with {@code
   * FeatureSpecificTestSuiteBuilder.suppressing()} until Sun bug
   * 5045147 is fixed.
   */
  @GwtIncompatible("reflection")
  public static Method getAddNullUnsupportedMethod() {
    return Helpers.getMethod(CollectionAddTester.class, "testAdd_nullUnsupported");
  }
}