| /* |
| * Copyright (C) 2008 The Guava Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.google.common.collect.testing.testers; |
| |
| import com.google.common.annotations.GwtCompatible; |
| import com.google.common.annotations.GwtIncompatible; |
| import com.google.common.collect.testing.Helpers; |
| import java.lang.reflect.Method; |
| import org.junit.Ignore; |
| |
| /** |
| * Tests {@link java.util.List#hashCode}. |
| * |
| * @author George van den Driessche |
| */ |
| @GwtCompatible(emulated = true) |
| @Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests. |
| public class ListHashCodeTester<E> extends AbstractListTester<E> { |
| public void testHashCode() { |
| int expectedHashCode = 1; |
| for (E element : getOrderedElements()) { |
| expectedHashCode = 31 * expectedHashCode + ((element == null) ? 0 : element.hashCode()); |
| } |
| assertEquals( |
| "A List's hashCode() should be computed from those of its elements.", |
| expectedHashCode, |
| getList().hashCode()); |
| } |
| |
| /** |
| * Returns the {@link Method} instance for {@link #testHashCode()} so that list tests on |
| * unhashable objects can suppress it with {@code FeatureSpecificTestSuiteBuilder.suppressing()}. |
| */ |
| @GwtIncompatible // reflection |
| public static Method getHashCodeMethod() { |
| return Helpers.getMethod(ListHashCodeTester.class, "testHashCode"); |
| } |
| } |