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Java example source code file (ImmutableMultimapTest.java)

This example Java source code file (ImmutableMultimapTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractmapentry, builder, gwtcompatible, immutablemultimap, immutablemultimaptest, immutablesetmultimap, integer, nullpointerexception, object, override, sampleelements, string, stringholder, unhashables, util

The ImmutableMultimapTest.java Java example source code

/*
 * 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;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.ImmutableMultimap.Builder;
import com.google.common.collect.testing.SampleElements;
import com.google.common.collect.testing.SampleElements.Unhashables;
import com.google.common.collect.testing.UnhashableObject;
import com.google.common.testing.EqualsTester;

import junit.framework.TestCase;

import java.util.Arrays;
import java.util.Map.Entry;

/**
 * Tests for {@link ImmutableMultimap}.
 *
 * @author Jared Levy
 */
@GwtCompatible(emulated = true)
public class ImmutableMultimapTest extends TestCase {

  public void testBuilder_withImmutableEntry() {
    ImmutableMultimap<String, Integer> multimap = new Builder()
        .put(Maps.immutableEntry("one", 1))
        .build();
    assertEquals(Arrays.asList(1), multimap.get("one"));
  }

  public void testBuilder_withImmutableEntryAndNullContents() {
    Builder<String, Integer> builder = new Builder();
    try {
      builder.put(Maps.immutableEntry("one", (Integer) null));
      fail();
    } catch (NullPointerException expected) {
    }
    try {
      builder.put(Maps.immutableEntry((String) null, 1));
      fail();
    } catch (NullPointerException expected) {
    }
  }

  private static class StringHolder {
    String string;
  }

  public void testBuilder_withMutableEntry() {
    ImmutableMultimap.Builder<String, Integer> builder =
        new Builder<String, Integer>();
    final StringHolder holder = new StringHolder();
    holder.string = "one";
    Entry<String, Integer> entry = new AbstractMapEntry() {
      @Override public String getKey() {
        return holder.string;
      }
      @Override public Integer getValue() {
        return 1;
      }
    };

    builder.put(entry);
    holder.string = "two";
    assertEquals(Arrays.asList(1), builder.build().get("one"));
  }

  // TODO: test ImmutableMultimap builder and factory methods

  public void testCopyOf() {
    ImmutableSetMultimap<String, String> setMultimap
        = ImmutableSetMultimap.of("k1", "v1");
    ImmutableMultimap<String, String> setMultimapCopy
        = ImmutableMultimap.copyOf(setMultimap);
    assertSame("copyOf(ImmutableSetMultimap) should not create a new instance",
        setMultimap, setMultimapCopy);

    ImmutableListMultimap<String, String> listMultimap
        = ImmutableListMultimap.of("k1", "v1");
    ImmutableMultimap<String, String> listMultimapCopy
        = ImmutableMultimap.copyOf(listMultimap);
    assertSame("copyOf(ImmutableListMultimap) should not create a new instance",
        listMultimap, listMultimapCopy);
  }

  public void testUnhashableSingletonValue() {
    SampleElements<UnhashableObject> unhashables = new Unhashables();
    Multimap<Integer, UnhashableObject> multimap = ImmutableMultimap.of(
        0, unhashables.e0());
    assertEquals(1, multimap.get(0).size());
    assertTrue(multimap.get(0).contains(unhashables.e0()));
  }

  public void testUnhashableMixedValues() {
    SampleElements<UnhashableObject> unhashables = new Unhashables();
    Multimap<Integer, Object> multimap = ImmutableMultimap.of(
        0, unhashables.e0(), 2, "hey you", 0, unhashables.e1());
    assertEquals(2, multimap.get(0).size());
    assertTrue(multimap.get(0).contains(unhashables.e0()));
    assertTrue(multimap.get(0).contains(unhashables.e1()));
    assertTrue(multimap.get(2).contains("hey you"));
  }

  public void testEquals() {
    new EqualsTester()
        .addEqualityGroup(ImmutableMultimap.of(), ImmutableMultimap.of())
        .addEqualityGroup(ImmutableMultimap.of(1, "a"), ImmutableMultimap.of(1, "a"))
        .addEqualityGroup(
            ImmutableMultimap.of(1, "a", 2, "b"),
            ImmutableMultimap.of(2, "b", 1, "a"))
        .testEquals();
  }
}

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