android/guava-tests/test/com/google/common/collect/MapMakerTest.java

/*
 * Copyright (C) 2011 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;

import static com.google.common.util.concurrent.Uninterruptibles.awaitUninterruptibly;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.base.Function;
import com.google.common.testing.NullPointerTester;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CountDownLatch;
import junit.framework.TestCase;

/** @author Charles Fry */
@GwtCompatible(emulated = true)
public class MapMakerTest extends TestCase {

  @GwtIncompatible // NullPointerTester
  public void testNullParameters() throws Exception {
    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicInstanceMethods(new MapMaker());
  }

  @GwtIncompatible // threads
  static final class DelayingIdentityLoader<T> implements Function<T, T> {
    private final CountDownLatch delayLatch;

    DelayingIdentityLoader(CountDownLatch delayLatch) {
      this.delayLatch = delayLatch;
    }

    @Override
    public T apply(T key) {
      awaitUninterruptibly(delayLatch);
      return key;
    }
  }

  /*
   * TODO(cpovirk): eliminate duplication between these tests and those in LegacyMapMakerTests and
   * anywhere else
   */

  /** Tests for the builder. */
  public static class MakerTest extends TestCase {
    public void testInitialCapacity_negative() {
      MapMaker maker = new MapMaker();
      try {
        maker.initialCapacity(-1);
        fail();
      } catch (IllegalArgumentException expected) {
      }
    }

    // TODO(cpovirk): enable when ready
    public void xtestInitialCapacity_setTwice() {
      MapMaker maker = new MapMaker().initialCapacity(16);
      try {
        // even to the same value is not allowed
        maker.initialCapacity(16);
        fail();
      } catch (IllegalArgumentException expected) {
      }
    }

    public void testReturnsPlainConcurrentHashMapWhenPossible() {
      Map<?, ?> map = new MapMaker().initialCapacity(5).makeMap();
      assertTrue(map instanceof ConcurrentHashMap);
    }
  }
}