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