streaming/src/test/scala/org/apache/gearpump/streaming/DAGSpec.scala

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 * to you under the Apache License, Version 2.0 (the
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 *
 *      http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.gearpump.streaming

import org.apache.gearpump.streaming.partitioner.PartitionerDescription
import org.apache.gearpump.streaming.task.TaskId
import org.apache.gearpump.util.Graph
import org.apache.gearpump.util.Graph.Node
import org.scalacheck.Gen
import org.scalatest.prop.PropertyChecks
import org.scalatest.{Matchers, PropSpec}

class DAGSpec extends PropSpec with PropertyChecks with Matchers {

  val parallelismGen = Gen.chooseNum[Int](1, 100)

  property("DAG should be built correctly for a single task") {
    forAll(parallelismGen) { (parallelism: Int) =>
      val task = ProcessorDescription(id = 0, taskClass = "task", parallelism = parallelism)
      val graph = Graph[ProcessorDescription, PartitionerDescription](task)
      val dag = DAG(graph)
      dag.processors.size shouldBe 1
      assert(dag.taskCount == parallelism)
      dag.tasks.sortBy(_.index) shouldBe (0 until parallelism).map(index => TaskId(0, index))
      dag.graph.getEdges shouldBe empty
    }
  }
}