Java tutorial
/** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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 org.apache.crunch.test; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.mapreduce.Counter; import org.apache.hadoop.mapreduce.TaskAttemptID; import org.apache.hadoop.mapreduce.TaskInputOutputContext; import org.junit.Rule; import org.mockito.Mockito; import org.mockito.invocation.InvocationOnMock; import org.mockito.stubbing.Answer; /** * A temporary workaround for Scala tests to use when working with Rule * annotations until it gets fixed in JUnit 4.11. */ public class CrunchTestSupport { @Rule public TemporaryPath tempDir = new TemporaryPath("crunch.tmp.dir", "hadoop.tmp.dir"); /** * The method creates a {@linkplain TaskInputOutputContext} which can be used * in unit tests. The context serves very limited purpose. You can only * operate with counters, taskAttempId, status and configuration while using * this context. */ public static <KI, VI, KO, VO> TaskInputOutputContext<KI, VI, KO, VO> getTestContext( final Configuration config) { TaskInputOutputContext<KI, VI, KO, VO> context = Mockito.mock(TaskInputOutputContext.class); TestCounters.clearCounters(); final StateHolder holder = new StateHolder(); Mockito.when(context.getCounter(Mockito.any(Enum.class))).then(new Answer<Counter>() { @Override public Counter answer(InvocationOnMock invocation) throws Throwable { Enum<?> counter = (Enum<?>) invocation.getArguments()[0]; return TestCounters.getCounter(counter); } }); Mockito.when(context.getCounter(Mockito.anyString(), Mockito.anyString())).then(new Answer<Counter>() { @Override public Counter answer(InvocationOnMock invocation) throws Throwable { String group = (String) invocation.getArguments()[0]; String name = (String) invocation.getArguments()[1]; return TestCounters.getCounter(group, name); } }); Mockito.when(context.getConfiguration()).thenReturn(config); Mockito.when(context.getTaskAttemptID()).thenReturn(new TaskAttemptID()); Mockito.when(context.getStatus()).then(new Answer<String>() { @Override public String answer(InvocationOnMock invocation) throws Throwable { return holder.internalStatus; } }); Mockito.doAnswer(new Answer<Void>() { @Override public Void answer(InvocationOnMock invocation) throws Throwable { holder.internalStatus = (String) invocation.getArguments()[0]; return null; } }).when(context).setStatus(Mockito.anyString()); return context; } static class StateHolder { private String internalStatus; } }