1 /* 2 * Copyright (C) 2008 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.collect.testing.testers; 18 19 import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES; 20 import static com.google.common.collect.testing.features.CollectionSize.ZERO; 21 import static com.google.common.collect.testing.features.ListFeature.SUPPORTS_SET; 22 23 import com.google.common.annotations.GwtCompatible; 24 import com.google.common.annotations.GwtIncompatible; 25 import com.google.common.collect.testing.Helpers; 26 import com.google.common.collect.testing.features.CollectionFeature; 27 import com.google.common.collect.testing.features.CollectionSize; 28 import com.google.common.collect.testing.features.ListFeature; 29 30 import java.lang.reflect.Method; 31 32 /** 33 * A generic JUnit test which tests {@code set()} operations on a list. Can't be 34 * invoked directly; please see 35 * {@link com.google.common.collect.testing.ListTestSuiteBuilder}. 36 * 37 * @author George van den Driessche 38 */ 39 @GwtCompatible(emulated = true) 40 public class ListSetTester<E> extends AbstractListTester<E> { 41 @ListFeature.Require(SUPPORTS_SET) 42 @CollectionSize.Require(absent = ZERO) 43 public void testSet() { 44 doTestSet(samples.e3); 45 } 46 47 @CollectionSize.Require(absent = ZERO) 48 @CollectionFeature.Require(ALLOWS_NULL_VALUES) 49 @ListFeature.Require(SUPPORTS_SET) 50 public void testSet_null() { 51 doTestSet(null); 52 } 53 54 @CollectionSize.Require(absent = ZERO) 55 @CollectionFeature.Require(ALLOWS_NULL_VALUES) 56 @ListFeature.Require(SUPPORTS_SET) 57 public void testSet_replacingNull() { 58 E[] elements = createSamplesArray(); 59 int i = aValidIndex(); 60 elements[i] = null; 61 collection = getSubjectGenerator().create(elements); 62 63 doTestSet(samples.e3); 64 } 65 66 private void doTestSet(E newValue) { 67 int index = aValidIndex(); 68 E initialValue = getList().get(index); 69 assertEquals("set(i, x) should return the old element at position i.", 70 initialValue, getList().set(index, newValue)); 71 assertEquals("After set(i, x), get(i) should return x", 72 newValue, getList().get(index)); 73 assertEquals("set() should not change the size of a list.", 74 getNumElements(), getList().size()); 75 } 76 77 @ListFeature.Require(SUPPORTS_SET) 78 public void testSet_indexTooLow() { 79 try { 80 getList().set(-1, samples.e3); 81 fail("set(-1) should throw IndexOutOfBoundsException"); 82 } catch (IndexOutOfBoundsException expected) { 83 } 84 expectUnchanged(); 85 } 86 87 @ListFeature.Require(SUPPORTS_SET) 88 public void testSet_indexTooHigh() { 89 int index = getNumElements(); 90 try { 91 getList().set(index, samples.e3); 92 fail("set(size) should throw IndexOutOfBoundsException"); 93 } catch (IndexOutOfBoundsException expected) { 94 } 95 expectUnchanged(); 96 } 97 98 @CollectionSize.Require(absent = ZERO) 99 @ListFeature.Require(absent = SUPPORTS_SET) 100 public void testSet_unsupported() { 101 try { 102 getList().set(aValidIndex(), samples.e3); 103 fail("set() should throw UnsupportedOperationException"); 104 } catch (UnsupportedOperationException expected) { 105 } 106 expectUnchanged(); 107 } 108 109 @CollectionSize.Require(ZERO) 110 @ListFeature.Require(absent = SUPPORTS_SET) 111 public void testSet_unsupportedByEmptyList() { 112 try { 113 getList().set(0, samples.e3); 114 fail("set() should throw UnsupportedOperationException " 115 + "or IndexOutOfBoundsException"); 116 } catch (UnsupportedOperationException tolerated) { 117 } catch (IndexOutOfBoundsException tolerated) { 118 } 119 expectUnchanged(); 120 } 121 122 @CollectionSize.Require(absent = ZERO) 123 @ListFeature.Require(SUPPORTS_SET) 124 @CollectionFeature.Require(absent = ALLOWS_NULL_VALUES) 125 public void testSet_nullUnsupported() { 126 try { 127 getList().set(aValidIndex(), null); 128 fail("set(null) should throw NullPointerException"); 129 } catch (NullPointerException expected) { 130 } 131 expectUnchanged(); 132 } 133 134 private int aValidIndex() { 135 return getList().size() / 2; 136 } 137 138 /** 139 * Returns the {@link java.lang.reflect.Method} instance for 140 * {@link #testSet_null()} so that tests of {@link 141 * java.util.Collections#checkedCollection(java.util.Collection, Class)} can 142 * suppress it with {@code FeatureSpecificTestSuiteBuilder.suppressing()} 143 * until <a 144 * href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6409434">Sun bug 145 * 6409434</a> is fixed. It's unclear whether nulls were to be permitted or 146 * forbidden, but presumably the eventual fix will be to permit them, as it 147 * seems more likely that code would depend on that behavior than on the 148 * other. Thus, we say the bug is in set(), which fails to support null. 149 */ 150 @GwtIncompatible("reflection") 151 public static Method getSetNullSupportedMethod() { 152 return Helpers.getMethod(ListSetTester.class, "testSet_null"); 153 } 154 } 155
