1 /* 2 * Copyright (C) 2007 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; 18 19 import com.google.common.annotations.GwtCompatible; 20 import java.util.Collection; 21 import org.junit.Ignore; 22 23 /** 24 * Base class for collection testers. 25 * 26 * @param <E> the element type of the collection to be tested. 27 * @author Kevin Bourrillion 28 */ 29 @GwtCompatible 30 @Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests. 31 public abstract class AbstractCollectionTester<E> 32 extends AbstractContainerTester<Collection<E>, E> { 33 34 // TODO: replace this with an accessor. 35 protected Collection<E> collection; 36 37 @Override actualContents()38 protected Collection<E> actualContents() { 39 return collection; 40 } 41 42 // TODO: dispose of this once collection is encapsulated. 43 @Override resetContainer(Collection<E> newContents)44 protected Collection<E> resetContainer(Collection<E> newContents) { 45 collection = super.resetContainer(newContents); 46 return collection; 47 } 48 49 /** @see AbstractContainerTester#resetContainer() */ resetCollection()50 protected void resetCollection() { 51 resetContainer(); 52 } 53 54 /** @return an array of the proper size with {@code null} inserted into the middle element. */ createArrayWithNullElement()55 protected E[] createArrayWithNullElement() { 56 E[] array = createSamplesArray(); 57 array[getNullLocation()] = null; 58 return array; 59 } 60 initCollectionWithNullElement()61 protected void initCollectionWithNullElement() { 62 E[] array = createArrayWithNullElement(); 63 resetContainer(getSubjectGenerator().create(array)); 64 } 65 66 /** 67 * Equivalent to {@link #expectMissing(Object[]) expectMissing}{@code (null)} except that the call 68 * to {@code contains(null)} is permitted to throw a {@code NullPointerException}. 69 * 70 * @param message message to use upon assertion failure 71 */ expectNullMissingWhenNullUnsupported(String message)72 protected void expectNullMissingWhenNullUnsupported(String message) { 73 try { 74 assertFalse(message, actualContents().contains(null)); 75 } catch (NullPointerException tolerated) { 76 // Tolerated 77 } 78 } 79 } 80