streaming/src/test/scala/org/apache/gearpump/streaming/state/impl/WindowSpec.scala

/*
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 * 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
 *
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 * See the License for the specific language governing permissions and
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package org.apache.gearpump.streaming.state.impl

import org.scalacheck.Gen
import org.scalatest.mock.MockitoSugar
import org.scalatest.prop.PropertyChecks
import org.scalatest.{Matchers, PropSpec}

import org.apache.gearpump.TimeStamp

class WindowSpec extends PropSpec with PropertyChecks with Matchers with MockitoSugar {

  val windowSizeGen = Gen.chooseNum[Long](1L, 1000L)
  val windowStepGen = Gen.chooseNum[Long](1L, 1000L)
  val timestampGen = Gen.chooseNum[Long](0L, 1000L)
  property("Window should only slide when time passes window end") {
    forAll(timestampGen, windowSizeGen, windowStepGen) {
      (timestamp: TimeStamp, windowSize: Long, windowStep: Long) =>
        val window = new Window(windowSize, windowStep)
        window.shouldSlide shouldBe false
        window.update(timestamp)
        window.shouldSlide shouldBe timestamp >= windowSize
    }
  }

  property("Window should slide by one or to given timestamp") {
    forAll(timestampGen, windowSizeGen, windowStepGen) {
      (timestamp: TimeStamp, windowSize: Long, windowStep: Long) =>
        val window = new Window(windowSize, windowStep)
        window.range shouldBe(0L, windowSize)

        window.slideOneStep()
        window.range shouldBe(windowStep, windowSize + windowStep)

        window.slideTo(timestamp)
        val (startTime, endTime) = window.range
        if (windowStep > windowSize) {
          timestamp should (be >= startTime and be < (startTime + windowStep))
        } else {
          timestamp should (be >= startTime and be < endTime)
        }
    }
  }
}