org.scalatest.concurrent

trait ConductorFixture

[source: org/scalatest/concurrent/ConductorFixture.scala]

trait ConductorFixture
extends AnyRef
Trait that can pass a new Conductor fixture into tests.

Here's an example of the use of this trait to test the ArrayBlockingQueue class from java.util.concurrent:

 import org.scalatest.fixture.FixtureFunSuite
 import org.scalatest.concurrent.ConductorFixture
 import org.scalatest.matchers.ShouldMatchers
 import java.util.concurrent.ArrayBlockingQueue

 class ArrayBlockingQueueSuite extends FixtureFunSuite with ConductorFixture with ShouldMatchers {
 
   test("calling put on a full queue blocks the producer thread") { conductor => import conductor._

     val buf = new ArrayBlockingQueue[Int](1)
 
     thread("producer") {
       buf put 42
       buf put 17
       beat should be (1)
     }
 
     thread("consumer") {
       waitForBeat(1)
       buf.take should be (42)
       buf.take should be (17)
     }
 
     whenFinished {
       buf should be ('empty)
     }
   }

   test("calling take on an empty queue blocks the consumer thread") { conductor => import conductor._

     val buf = new ArrayBlockingQueue[Int](1)

     thread("producer") {
       waitForBeat(1)
       buf put 42
       buf put 17
     }

     thread("consumer") {
       buf.take should be (42)
       buf.take should be (17)
       beat should be (1)
     }

     whenFinished {
       buf should be ('empty)
     }
   }
 }
 

For an explanation of how these tests work, see the documentation for Conductor.

Author
Bill Venners
Type Summary
type FixtureParam
Defines type Fixture to be Conductor.
Method Summary
def withFixture (test : OneArgTest) : Unit
Creates a new Conductor, passes the Conductor to the specified test function, and ensures that conduct gets invoked on the Conductor.
Methods inherited from AnyRef
getClass, hashCode, equals, clone, toString, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized
Methods inherited from Any
==, !=, isInstanceOf, asInstanceOf
Type Details
type FixtureParam
Defines type Fixture to be Conductor.

Method Details
def withFixture(test : OneArgTest) : Unit
Creates a new Conductor, passes the Conductor to the specified test function, and ensures that conduct gets invoked on the Conductor.

After the test function returns (so long as it returns normally and doesn't complete abruptly with an exception), this method will determine whether the conduct method has already been called (by invoking conductingHasBegun on the Conductor). If not, this method will invoke conduct to ensure that the multi-threaded scenario is actually conducted.



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