crunch-scrunch/src/test/scala/org/apache/crunch/scrunch/AggregatorsTest.scala

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package org.apache.crunch.scrunch

import org.scalatest.junit.JUnitSuite
import _root_.org.junit.{Assert, Test}

class AggregatorsTest extends JUnitSuite {

  @Test def testSum {
    val pc = Mem.collectionOf((1, 0.1), (2, 1.2), (3, 2.2), (4, 2.0), (5, 0.0))
    val sum = pc.aggregate(Aggregators.sum).materialize().toList
    Assert.assertEquals(1, sum.size)
    Assert.assertEquals(15, sum(0)._1)
    Assert.assertEquals(5.5, sum(0)._2, 0.001)
  }

  @Test def testMin {
    val pc = Mem.collectionOf(1, 2, 3, 4, 5)
    val min = pc.aggregate(Aggregators.min).materialize().toList
    Assert.assertEquals(1, min.size)
    Assert.assertEquals(1, min(0))
  }

  @Test def testMax {
    val pc = Mem.collectionOf(1, 2, 3, 4, 5)
    val max = pc.aggregate(Aggregators.max).materialize().toList
    Assert.assertEquals(1, max.size)
    Assert.assertEquals(5, max(0))
  }
}