1 /* 2 * Copyright (C) 2009 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.testing; 18 19 import java.io.Serializable; 20 import junit.framework.AssertionFailedError; 21 import junit.framework.TestCase; 22 23 /** 24 * Tests for {@link SerializableTester}. 25 * 26 * @author Nick Kralevich 27 */ 28 public class SerializableTesterTest extends TestCase { testStringAssertions()29 public void testStringAssertions() { 30 String original = "hello world"; 31 String copy = SerializableTester.reserializeAndAssert(original); 32 assertEquals(original, copy); 33 assertNotSame(original, copy); 34 } 35 testClassWhichDoesNotImplementEquals()36 public void testClassWhichDoesNotImplementEquals() { 37 ClassWhichDoesNotImplementEquals orig = new ClassWhichDoesNotImplementEquals(); 38 boolean errorNotThrown = false; 39 try { 40 SerializableTester.reserializeAndAssert(orig); 41 errorNotThrown = true; 42 } catch (AssertionFailedError error) { 43 // expected 44 assertContains("must be Object#equals to", error.getMessage()); 45 } 46 assertFalse(errorNotThrown); 47 } 48 testClassWhichIsAlwaysEqualButHasDifferentHashcodes()49 public void testClassWhichIsAlwaysEqualButHasDifferentHashcodes() { 50 ClassWhichIsAlwaysEqualButHasDifferentHashcodes orig = 51 new ClassWhichIsAlwaysEqualButHasDifferentHashcodes(); 52 boolean errorNotThrown = false; 53 try { 54 SerializableTester.reserializeAndAssert(orig); 55 errorNotThrown = true; 56 } catch (AssertionFailedError error) { 57 // expected 58 assertContains("must be equal to the Object#hashCode", error.getMessage()); 59 } 60 assertFalse(errorNotThrown); 61 } 62 testObjectWhichIsEqualButChangesClass()63 public void testObjectWhichIsEqualButChangesClass() { 64 ObjectWhichIsEqualButChangesClass orig = new ObjectWhichIsEqualButChangesClass(); 65 boolean errorNotThrown = false; 66 try { 67 SerializableTester.reserializeAndAssert(orig); 68 errorNotThrown = true; 69 } catch (AssertionFailedError error) { 70 // expected 71 assertContains("expected:<class ", error.getMessage()); 72 } 73 assertFalse(errorNotThrown); 74 } 75 76 private static class ClassWhichDoesNotImplementEquals implements Serializable { 77 private static final long serialVersionUID = 1L; 78 } 79 80 private static class ClassWhichIsAlwaysEqualButHasDifferentHashcodes implements Serializable { 81 private static final long serialVersionUID = 2L; 82 83 @SuppressWarnings("EqualsHashCode") 84 @Override equals(Object other)85 public boolean equals(Object other) { 86 return (other instanceof ClassWhichIsAlwaysEqualButHasDifferentHashcodes); 87 } 88 } 89 90 private static class ObjectWhichIsEqualButChangesClass implements Serializable { 91 private static final long serialVersionUID = 1L; 92 93 @Override equals(Object other)94 public boolean equals(Object other) { 95 return (other instanceof ObjectWhichIsEqualButChangesClass || other instanceof OtherForm); 96 } 97 98 @Override hashCode()99 public int hashCode() { 100 return 1; 101 } 102 writeReplace()103 private Object writeReplace() { 104 return new OtherForm(); 105 } 106 107 private static class OtherForm implements Serializable { 108 @Override equals(Object other)109 public boolean equals(Object other) { 110 return (other instanceof ObjectWhichIsEqualButChangesClass || other instanceof OtherForm); 111 } 112 113 @Override hashCode()114 public int hashCode() { 115 return 1; 116 } 117 } 118 } 119 assertContains(String expectedSubstring, String actual)120 private static void assertContains(String expectedSubstring, String actual) { 121 // TODO(kevinb): use a Truth assertion here 122 if (!actual.contains(expectedSubstring)) { 123 fail("expected <" + actual + "> to contain <" + expectedSubstring + ">"); 124 } 125 } 126 } 127