1 /* 2 * Copyright (C) 2006 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.base; 18 19 import com.google.common.annotations.GwtCompatible; 20 import com.google.common.annotations.GwtIncompatible; 21 import com.google.common.testing.NullPointerTester; 22 import junit.framework.TestCase; 23 24 /** 25 * Tests for {@link Objects}. 26 * 27 * @author Laurence Gonsalves 28 */ 29 @GwtCompatible(emulated = true) 30 public class ObjectsTest extends TestCase { 31 testEqual()32 public void testEqual() throws Exception { 33 assertTrue(Objects.equal(1, 1)); 34 assertTrue(Objects.equal(null, null)); 35 36 // test distinct string objects 37 String s1 = "foobar"; 38 String s2 = new String(s1); 39 assertTrue(Objects.equal(s1, s2)); 40 41 assertFalse(Objects.equal(s1, null)); 42 assertFalse(Objects.equal(null, s1)); 43 assertFalse(Objects.equal("foo", "bar")); 44 assertFalse(Objects.equal("1", 1)); 45 } 46 testHashCode()47 public void testHashCode() throws Exception { 48 int h1 = Objects.hashCode(1, "two", 3.0); 49 int h2 = Objects.hashCode(new Integer(1), new String("two"), new Double(3.0)); 50 // repeatable 51 assertEquals(h1, h2); 52 53 // These don't strictly need to be true, but they're nice properties. 54 assertTrue(Objects.hashCode(1, 2, null) != Objects.hashCode(1, 2)); 55 assertTrue(Objects.hashCode(1, 2, null) != Objects.hashCode(1, null, 2)); 56 assertTrue(Objects.hashCode(1, null, 2) != Objects.hashCode(1, 2)); 57 assertTrue(Objects.hashCode(1, 2, 3) != Objects.hashCode(3, 2, 1)); 58 assertTrue(Objects.hashCode(1, 2, 3) != Objects.hashCode(2, 3, 1)); 59 } 60 61 @GwtIncompatible // NullPointerTester testNullPointers()62 public void testNullPointers() { 63 NullPointerTester tester = new NullPointerTester(); 64 tester.testAllPublicStaticMethods(Objects.class); 65 } 66 } 67