src/contrib/mrunit/src/test/org/apache/hadoop/mrunit/TestExample.java

/**
 * 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.hadoop.mrunit;

import junit.framework.TestCase;

import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.lib.IdentityMapper;
import org.junit.Before;
import org.junit.Test;

/**
 * Example test of the IdentityMapper to demonstrate proper MapDriver
 * usage in a test case.
 *
 * This example is reproduced in the overview for the MRUnit javadoc.
 */
public class TestExample extends TestCase {

  private Mapper<Text, Text, Text, Text> mapper;
  private MapDriver<Text, Text, Text, Text> driver;

  @Before
  public void setUp() {
    mapper = new IdentityMapper<Text, Text>();
    driver = new MapDriver<Text, Text, Text, Text>(mapper);
  }

  @Test
  public void testIdentityMapper() {
    driver.withInput(new Text("foo"), new Text("bar"))
            .withOutput(new Text("foo"), new Text("bar"))
            .runTest();
  }
}