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 23 import junit.framework.TestCase; 24 25 /** 26 * Tests for {@link Objects}. 27 * 28 * @author Laurence Gonsalves 29 */ 30 @GwtCompatible(emulated = true) 31 public class ObjectsTest extends TestCase { 32 33 public void testEqual() throws Exception { 34 assertTrue(Objects.equal(1, 1)); 35 assertTrue(Objects.equal(null, null)); 36 37 // test distinct string objects 38 String s1 = "foobar"; 39 String s2 = new String(s1); 40 assertTrue(Objects.equal(s1, s2)); 41 42 assertFalse(Objects.equal(s1, null)); 43 assertFalse(Objects.equal(null, s1)); 44 assertFalse(Objects.equal("foo", "bar")); 45 assertFalse(Objects.equal("1", 1)); 46 } 47 48 public void testHashCode() throws Exception { 49 int h1 = Objects.hashCode(1, "two", 3.0); 50 int h2 = Objects.hashCode( 51 new Integer(1), new String("two"), new Double(3.0)); 52 // repeatable 53 assertEquals(h1, h2); 54 55 // These don't strictly need to be true, but they're nice properties. 56 assertTrue(Objects.hashCode(1, 2, null) != Objects.hashCode(1, 2)); 57 assertTrue(Objects.hashCode(1, 2, null) != Objects.hashCode(1, null, 2)); 58 assertTrue(Objects.hashCode(1, null, 2) != Objects.hashCode(1, 2)); 59 assertTrue(Objects.hashCode(1, 2, 3) != Objects.hashCode(3, 2, 1)); 60 assertTrue(Objects.hashCode(1, 2, 3) != Objects.hashCode(2, 3, 1)); 61 } 62 63 public void testFirstNonNull_withNonNull() throws Exception { 64 String s1 = "foo"; 65 String s2 = Objects.firstNonNull(s1, "bar"); 66 assertSame(s1, s2); 67 68 Long n1 = new Long(42); 69 Long n2 = Objects.firstNonNull(null, n1); 70 assertSame(n1, n2); 71 } 72 73 public void testFirstNonNull_throwsNullPointerException() throws Exception { 74 try { 75 Objects.firstNonNull(null, null); 76 fail("expected NullPointerException"); 77 } catch (NullPointerException expected) { 78 } 79 } 80 81 @GwtIncompatible("NullPointerTester") 82 public void testNullPointers() { 83 NullPointerTester tester = new NullPointerTester(); 84 tester.testAllPublicStaticMethods(Objects.class); 85 } 86 } 87
