/*
    * Copyright (C) 2006 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.base;
  
  import com.google.common.annotations.GwtCompatible;
  import com.google.common.annotations.GwtIncompatible;
  import com.google.common.testing.NullPointerTester;
  
  import junit.framework.TestCase;
  
  /**
   * Tests for {@link Objects}.
   *
   * @author Laurence Gonsalves
   */
  @GwtCompatible(emulated = true)
  public class ObjectsTest extends TestCase {
  
    public void testEqual() throws Exception {
      assertTrue(Objects.equal(1, 1));
      assertTrue(Objects.equal(null, null));
  
      // test distinct string objects
      String s1 = "foobar";
      String s2 = new String(s1);
      assertTrue(Objects.equal(s1, s2));
  
      assertFalse(Objects.equal(s1, null));
      assertFalse(Objects.equal(null, s1));
      assertFalse(Objects.equal("foo", "bar"));
      assertFalse(Objects.equal("1", 1));
    }
  
    public void testHashCode() throws Exception {
      int h1 = Objects.hashCode(1, "two", 3.0);
      int h2 = Objects.hashCode(
          new Integer(1), new String("two"), new Double(3.0));
      // repeatable
      assertEquals(h1, h2);
  
      // These don't strictly need to be true, but they're nice properties.
      assertTrue(Objects.hashCode(1, 2, null) != Objects.hashCode(1, 2));
      assertTrue(Objects.hashCode(1, 2, null) != Objects.hashCode(1, null, 2));
      assertTrue(Objects.hashCode(1, null, 2) != Objects.hashCode(1, 2));
      assertTrue(Objects.hashCode(1, 2, 3) != Objects.hashCode(3, 2, 1));
      assertTrue(Objects.hashCode(1, 2, 3) != Objects.hashCode(2, 3, 1));
    }
  
    public void testFirstNonNull_withNonNull() throws Exception {
      String s1 = "foo";
      String s2 = Objects.firstNonNull(s1, "bar");
      assertSame(s1, s2);
  
      Long n1 = new Long(42);
      Long n2 = Objects.firstNonNull(null, n1);
      assertSame(n1, n2);
    }
  
    public void testFirstNonNull_throwsNullPointerException() throws Exception {
      try {
        Objects.firstNonNull(null, null);
        fail("expected NullPointerException");
      } catch (NullPointerException expected) {
      }
    }
  
    @GwtIncompatible("NullPointerTester")
    public void testNullPointers() {
      NullPointerTester tester = new NullPointerTester();
      tester.testAllPublicStaticMethods(Objects.class);
    }
  }