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Java example source code file (MultisetsTest.java)

This example Java source code file (MultisetsTest.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

derivedcomparable, gwtcompatible, gwtincompatible, immutablemultiset, iterable, legacycomparable, list, multiset, multisetstest, nullpointertester, suppresswarnings, testcase, treemultiset, util

The MultisetsTest.java Java example source code

/*
 * 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;

import static com.google.common.truth.Truth.assertThat;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.DerivedComparable;
import com.google.common.testing.NullPointerTester;

import junit.framework.TestCase;

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

/**
 * Tests for {@link Multisets}.
 *
 * @author Mike Bostock
 * @author Jared Levy
 * @author Louis Wasserman
 */
@GwtCompatible(emulated = true)
public class MultisetsTest extends TestCase {

  /* See MultisetsImmutableEntryTest for immutableEntry() tests. */

  public void testNewTreeMultisetDerived() {
    TreeMultiset<DerivedComparable> set = TreeMultiset.create();
    assertTrue(set.isEmpty());
    set.add(new DerivedComparable("foo"), 2);
    set.add(new DerivedComparable("bar"), 3);
    assertThat(set).containsExactly(
        new DerivedComparable("bar"), new DerivedComparable("bar"), new DerivedComparable("bar"),
        new DerivedComparable("foo"), new DerivedComparable("foo")).inOrder();
  }

  public void testNewTreeMultisetNonGeneric() {
    TreeMultiset<LegacyComparable> set = TreeMultiset.create();
    assertTrue(set.isEmpty());
    set.add(new LegacyComparable("foo"), 2);
    set.add(new LegacyComparable("bar"), 3);
    assertThat(set).containsExactly(new LegacyComparable("bar"),
        new LegacyComparable("bar"), new LegacyComparable("bar"),
        new LegacyComparable("foo"), new LegacyComparable("foo")).inOrder();
  }

  public void testNewTreeMultisetComparator() {
    TreeMultiset<String> multiset
        = TreeMultiset.create(Collections.reverseOrder());
    multiset.add("bar", 3);
    multiset.add("foo", 2);
    assertThat(multiset).containsExactly("foo", "foo", "bar", "bar", "bar").inOrder();
  }

  public void testRetainOccurrencesEmpty() {
    Multiset<String> multiset = HashMultiset.create();
    Multiset<String> toRetain =
        HashMultiset.create(Arrays.asList("a", "b", "a"));
    assertFalse(Multisets.retainOccurrences(multiset, toRetain));
    assertThat(multiset).isEmpty();
  }

  public void testRemoveOccurrencesIterableEmpty() {
    Multiset<String> multiset = HashMultiset.create();
    Iterable<String> toRemove = Arrays.asList("a", "b", "a");
    assertFalse(Multisets.removeOccurrences(multiset, toRemove));
    assertTrue(multiset.isEmpty());
  }

  public void testRemoveOccurrencesMultisetEmpty() {
    Multiset<String> multiset = HashMultiset.create();
    Multiset<String> toRemove =
        HashMultiset.create(Arrays.asList("a", "b", "a"));
    assertFalse(Multisets.removeOccurrences(multiset, toRemove));
    assertTrue(multiset.isEmpty());
  }

  public void testUnion() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create(
        Arrays.asList("a", "b", "b", "c"));
    assertThat(Multisets.union(ms1, ms2)).containsExactly("a", "a", "b", "b", "c");
  }

  public void testUnionEqualMultisets() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    assertEquals(ms1, Multisets.union(ms1, ms2));
  }

  public void testUnionEmptyNonempty() {
    Multiset<String> ms1 = HashMultiset.create();
    Multiset<String> ms2 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    assertEquals(ms2, Multisets.union(ms1, ms2));
  }

  public void testUnionNonemptyEmpty() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create();
    assertEquals(ms1, Multisets.union(ms1, ms2));
  }

  public void testIntersectEmptyNonempty() {
    Multiset<String> ms1 = HashMultiset.create();
    Multiset<String> ms2 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    assertThat(Multisets.intersection(ms1, ms2)).isEmpty();
  }

  public void testIntersectNonemptyEmpty() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create();
    assertThat(Multisets.intersection(ms1, ms2)).isEmpty();
  }

  public void testSum() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create(Arrays.asList("b", "c"));
    assertThat(Multisets.sum(ms1, ms2)).containsExactly("a", "a", "b", "b", "c");
  }

  public void testSumEmptyNonempty() {
    Multiset<String> ms1 = HashMultiset.create();
    Multiset<String> ms2 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    assertThat(Multisets.sum(ms1, ms2)).containsExactly("a", "b", "a");
  }

  public void testSumNonemptyEmpty() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create();
    assertThat(Multisets.sum(ms1, ms2)).containsExactly("a", "b", "a");
  }

  public void testDifferenceWithNoRemovedElements() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create(Arrays.asList("a"));
    assertThat(Multisets.difference(ms1, ms2)).containsExactly("a", "b");
  }

  public void testDifferenceWithRemovedElement() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create(Arrays.asList("b"));
    assertThat(Multisets.difference(ms1, ms2)).containsExactly("a", "a");
  }

  public void testDifferenceWithMoreElementsInSecondMultiset() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create(Arrays.asList("a", "b", "b", "b"));
    Multiset<String> diff = Multisets.difference(ms1, ms2);
    assertThat(diff).contains("a");
    assertEquals(0, diff.count("b"));
    assertEquals(1, diff.count("a"));
    assertFalse(diff.contains("b"));
    assertTrue(diff.contains("a"));
  }

  public void testDifferenceEmptyNonempty() {
    Multiset<String> ms1 = HashMultiset.create();
    Multiset<String> ms2 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    assertEquals(ms1, Multisets.difference(ms1, ms2));
  }

  public void testDifferenceNonemptyEmpty() {
    Multiset<String> ms1 = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> ms2 = HashMultiset.create();
    assertEquals(ms1, Multisets.difference(ms1, ms2));
  }

  public void testContainsOccurrencesEmpty() {
    Multiset<String> superMultiset = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> subMultiset = HashMultiset.create();
    assertTrue(Multisets.containsOccurrences(superMultiset, subMultiset));
    assertFalse(Multisets.containsOccurrences(subMultiset, superMultiset));
  }

  public void testContainsOccurrences() {
    Multiset<String> superMultiset = HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> subMultiset = HashMultiset.create(Arrays.asList("a", "b"));
    assertTrue(Multisets.containsOccurrences(superMultiset, subMultiset));
    assertFalse(Multisets.containsOccurrences(subMultiset, superMultiset));
    Multiset<String> diffMultiset = HashMultiset.create(Arrays.asList("a", "b", "c"));
    assertFalse(Multisets.containsOccurrences(superMultiset, diffMultiset));
    assertTrue(Multisets.containsOccurrences(diffMultiset, subMultiset));
  }

  public void testRetainEmptyOccurrences() {
    Multiset<String> multiset =
        HashMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> toRetain = HashMultiset.create();
    assertTrue(Multisets.retainOccurrences(multiset, toRetain));
    assertTrue(multiset.isEmpty());
  }

  public void testRetainOccurrences() {
    Multiset<String> multiset =
        TreeMultiset.create(Arrays.asList("a", "b", "a", "c"));
    Multiset<String> toRetain =
        HashMultiset.create(Arrays.asList("a", "b", "b"));
    assertTrue(Multisets.retainOccurrences(multiset, toRetain));
    assertThat(multiset).containsExactly("a", "b").inOrder();
  }

  public void testRemoveEmptyOccurrencesMultiset() {
    Multiset<String> multiset =
        TreeMultiset.create(Arrays.asList("a", "b", "a"));
    Multiset<String> toRemove = HashMultiset.create();
    assertFalse(Multisets.removeOccurrences(multiset, toRemove));
    assertThat(multiset).containsExactly("a", "a", "b").inOrder();
  }

  public void testRemoveOccurrencesMultiset() {
    Multiset<String> multiset =
        TreeMultiset.create(Arrays.asList("a", "b", "a", "c"));
    Multiset<String> toRemove =
        HashMultiset.create(Arrays.asList("a", "b", "b"));
    assertTrue(Multisets.removeOccurrences(multiset, toRemove));
    assertThat(multiset).containsExactly("a", "c").inOrder();
  }

  public void testRemoveEmptyOccurrencesIterable() {
    Multiset<String> multiset =
        TreeMultiset.create(Arrays.asList("a", "b", "a"));
    Iterable<String> toRemove = ImmutableList.of();
    assertFalse(Multisets.removeOccurrences(multiset, toRemove));
    assertThat(multiset).containsExactly("a", "a", "b").inOrder();
  }

  public void testRemoveOccurrencesMultisetIterable() {
    Multiset<String> multiset =
        TreeMultiset.create(Arrays.asList("a", "b", "a", "c"));
    List<String> toRemove = Arrays.asList("a", "b", "b");
    assertTrue(Multisets.removeOccurrences(multiset, toRemove));
    assertThat(multiset).containsExactly("a", "c").inOrder();
  }

  @SuppressWarnings("deprecation")
  public void testUnmodifiableMultisetShortCircuit() {
    Multiset<String> mod = HashMultiset.create();
    Multiset<String> unmod = Multisets.unmodifiableMultiset(mod);
    assertNotSame(mod, unmod);
    assertSame(unmod, Multisets.unmodifiableMultiset(unmod));
    ImmutableMultiset<String> immutable = ImmutableMultiset.of("a", "a", "b", "a");
    assertSame(immutable, Multisets.unmodifiableMultiset(immutable));
    assertSame(immutable, Multisets.unmodifiableMultiset((Multiset<String>) immutable));
  }

  public void testHighestCountFirst() {
    Multiset<String> multiset = HashMultiset.create(
        Arrays.asList("a", "a", "a", "b", "c", "c"));
    ImmutableMultiset<String> sortedMultiset =
        Multisets.copyHighestCountFirst(multiset);

    assertThat(sortedMultiset.entrySet()).containsExactly(
        Multisets.immutableEntry("a", 3), Multisets.immutableEntry("c", 2),
        Multisets.immutableEntry("b", 1)).inOrder();

    assertThat(sortedMultiset).containsExactly(
        "a",
        "a",
        "a",
        "c",
        "c",
        "b").inOrder();

    assertThat(Multisets.copyHighestCountFirst(ImmutableMultiset.of())).isEmpty();
  }

  @GwtIncompatible // NullPointerTester
  public void testNullPointers() {
    new NullPointerTester().testAllPublicStaticMethods(Multisets.class);
  }
}

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