Java example source code file (MultisetsImmutableEntryTest.java)

This example Java source code file (MultisetsImmutableEntryTest.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

entry, gwtcompatible, illegalargumentexception, multisetsimmutableentrytest, object, string, testcase, util

The MultisetsImmutableEntryTest.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 com.google.common.annotations.GwtCompatible;
import com.google.common.collect.Multiset.Entry;

import junit.framework.TestCase;

import java.util.Collections;

/**
 * Tests for {@link Multisets#immutableEntry}.
 *
 * @author Mike Bostock
 */
@GwtCompatible
public class MultisetsImmutableEntryTest extends TestCase {
  private static final String NE = null;

  private static <E> Entry entry(final E element, final int count) {
    return Multisets.immutableEntry(element, count);
  }

  private static <E> Entry control(E element, int count) {
    return HashMultiset.create(Collections.nCopies(count, element))
        .entrySet().iterator().next();
  }

  public void testToString() {
    assertEquals("foo", entry("foo", 1).toString());
    assertEquals("bar x 2", entry("bar", 2).toString());
  }

  public void testToStringNull() {
    assertEquals("null", entry(NE, 1).toString());
    assertEquals("null x 2", entry(NE, 2).toString());
  }

  public void testEquals() {
    assertEquals(control("foo", 1), entry("foo", 1));
    assertEquals(control("bar", 2), entry("bar", 2));
    assertFalse(control("foo", 1).equals(entry("foo", 2)));
    assertFalse(entry("foo", 1).equals(control("bar", 1)));
    assertFalse(entry("foo", 1).equals(new Object()));
    assertFalse(entry("foo", 1).equals(null));
  }

  public void testEqualsNull() {
    assertEquals(control(NE, 1), entry(NE, 1));
    assertFalse(control(NE, 1).equals(entry(NE, 2)));
    assertFalse(entry(NE, 1).equals(control("bar", 1)));
    assertFalse(entry(NE, 1).equals(new Object()));
    assertFalse(entry(NE, 1).equals(null));
  }

  public void testHashCode() {
    assertEquals(control("foo", 1).hashCode(), entry("foo", 1).hashCode());
    assertEquals(control("bar", 2).hashCode(), entry("bar", 2).hashCode());
  }

  public void testHashCodeNull() {
    assertEquals(control(NE, 1).hashCode(), entry(NE, 1).hashCode());
  }

  public void testNegativeCount() {
    try {
      entry("foo", -1);
      fail();
    } catch (IllegalArgumentException expected) {}
  }
}