crunch-scrunch/src/it/scala/org/apache/crunch/scrunch/WordCountTest.scala

/**
 * 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
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 */
package org.apache.crunch.scrunch

import org.apache.crunch.io.{From => from, To => to}
import org.apache.crunch.test.CrunchTestSupport

import org.scalatest.junit.JUnitSuite
import _root_.org.junit.Test

class WordCountTest extends CrunchTestSupport with JUnitSuite {
  @Test def wordCount {
    val pipeline = Pipeline.mapReduce[WordCountTest](tempDir.getDefaultConfiguration)
    val input = tempDir.copyResourceFileName("shakes.txt")
    val wordCountOut = tempDir.getFileName("output")

    val fcc = pipeline.read(from.textFile(input))
        .flatMap(_.toLowerCase.split("\\s+"))
        .filter(!_.isEmpty()).count
        .write(to.textFile(wordCountOut)) // Word counts
        .map((w, c) => (w.slice(0, 1), c))
        .groupByKey.combine(v => v.sum).materialize
    assert(fcc.exists(_ == ("w", 1404)))

    pipeline.done
  }
}