org.scalatest

# ParallelTestExecution

#### trait ParallelTestExecution extends OneInstancePerTest

Trait that causes that the tests of any suite it is mixed into to be run in parallel if a `Distributor` is passed to `runTests`.

ScalaTest's normal approach for running suites of tests in parallel is to run different suites in parallel, but the tests of any one suite sequentially. This approach should provide sufficient distribution of the work load in most cases, but some suites may encapsulate multiple long-running tests. Such suites may dominate the execution time of the run. If so, mixing in this trait into just those suites will allow their long-running tests to run in parallel with each other, thereby helping to reduce the total time required to run an entire run.

Because this trait extends `OneInstancePerTest`, each test will be run its own instance of the suite's class. This trait overrides the`runTests` method. If no `Distributor` is passed to `runTests`, this trait's implementation simply invokes its supertrait `OneInstancePerTest`'s implementation of `runTests`, which will run each test in its own instance sequentially. If a `Distributor`is passed, however, this traits' implementation of `runTests` will, for each test, wrap a new instance of the suite in a special wrapper suite that will invoke just that one test, and passes the wrapper suites to the `Distributor`. The thread or entity that takes a wrapper suite from the `Distributor` will invoke `run`on the wrapper suite, which will run just one test. In this way, different tests of a suite that mixes in`ParallelTestExecution` will run in parallel.

authors:

1. Bill Venners

Inherited

1. Hide All
2. Show all

1. OneInstancePerTest
2. AbstractSuite
3. AnyRef
4. Any

Visibility

1. Public
2. All

### Value Members

1. #### def !=(arg0: AnyRef): Boolean

   attributes: final
   definition classes: AnyRef

2. #### def !=(arg0: Any): Boolean

   `o != arg0` is the same as `!(o == (arg0))`.

   `o != arg0` is the same as `!(o == (arg0))`.

   arg0

     the object to compare against this object for dis-equality.

   returns

     `false` if the receiver object is equivalent to the argument; `true` otherwise.

   attributes: final
   definition classes: Any

3. #### def ##(): Int

   attributes: final
   definition classes: AnyRef → Any

4. #### def $asInstanceOf[T0](): T0

   attributes: final
   definition classes: AnyRef

5. #### def $isInstanceOf[T0](): Boolean

   attributes: final
   definition classes: AnyRef

6. #### def ==(arg0: AnyRef): Boolean

   `o == arg0` is the same as `if (o eq null) arg0 eq null else o.equals(arg0)`.

   `o == arg0` is the same as `if (o eq null) arg0 eq null else o.equals(arg0)`.

   arg0

     the object to compare against this object for equality.

   returns

     `true` if the receiver object is equivalent to the argument; `false` otherwise.

   attributes: final
   definition classes: AnyRef

7. #### def ==(arg0: Any): Boolean

   `o == arg0` is the same as `o.equals(arg0)`.

   `o == arg0` is the same as `o.equals(arg0)`.

   arg0

     the object to compare against this object for equality.

   returns

     `true` if the receiver object is equivalent to the argument; `false` otherwise.

   attributes: final
   definition classes: Any

8. #### def asInstanceOf[T0]: T0

   This method is used to cast the receiver object to be of type `T0`.

   This method is used to cast the receiver object to be of type `T0`.

   Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression`1.asInstanceOf[String]` will throw a `ClassCastException` at runtime, while the expression`List(1).asInstanceOf[List[String]]` will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested typed.

   returns

     the receiver object.

   attributes: final
   definition classes: Any

9. #### def clone(): AnyRef

   This method creates and returns a copy of the receiver object.

   This method creates and returns a copy of the receiver object.

   The default implementation of the `clone` method is platform dependent.

   returns

     a copy of the receiver object.

   attributes: protected
   definition classes: AnyRef

10. #### def eq(arg0: AnyRef): Boolean

    This method is used to test whether the argument (`arg0`) is a reference to the receiver object (`this`).

    This method is used to test whether the argument (`arg0`) is a reference to the receiver object (`this`).

    The `eq` method implements an [http://en.wikipedia.org/wiki/Equivalence_relation equivalence relation] on non-null instances of `AnyRef`: * It is reflexive: for any non-null instance `x` of type `AnyRef`, `x.eq(x)` returns `true`. * It is symmetric: for any non-null instances `x` and `y` of type `AnyRef`, `x.eq(y)` returns `true` if and only if `y.eq(x)` returns `true`. * It is transitive: for any non-null instances `x`, `y`, and `z` of type `AnyRef` if `x.eq(y)` returns `true` and `y.eq(z)` returns `true`, then `x.eq(z)` returns `true`.

    Additionally, the `eq` method has three other properties. * It is consistent: for any non-null instances `x` and `y` of type `AnyRef`, multiple invocations of `x.eq(y)` consistently returns `true` or consistently returns `false`. * For any non-null instance `x` of type `AnyRef`, `x.eq(null)` and `null.eq(x)` returns `false`. * `null.eq(null)` returns `true`.

    When overriding the `equals` or `hashCode` methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (`o1 eq o2`), they should be equal to each other (`o1 == o2`) and they should hash to the same value (`o1.hashCode == o2.hashCode`).

    arg0

      the object to compare against this object for reference equality.

    returns

      `true` if the argument is a reference to the receiver object; `false` otherwise.

    attributes: final
    definition classes: AnyRef

11. #### def equals(arg0: Any): Boolean

    This method is used to compare the receiver object (`this`) with the argument object (`arg0`) for equivalence.

    This method is used to compare the receiver object (`this`) with the argument object (`arg0`) for equivalence.

    The default implementations of this method is an [http://en.wikipedia.org/wiki/Equivalence_relation equivalence relation]: * It is reflexive: for any instance `x` of type `Any`, `x.equals(x)` should return `true`. * It is symmetric: for any instances `x` and `y` of type `Any`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`. * It is transitive: for any instances `x`, `y`, and `z` of type `AnyRef` if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`.

    If you override this method, you should verify that your implementation remains an equivalence relation. Additionally, when overriding this method it is often necessary to override `hashCode` to ensure that objects that are "equal" (`o1.equals(o2)` returns `true`) hash to the same scala.Int (`o1.hashCode.equals(o2.hashCode)`).

    arg0

      the object to compare against this object for equality.

    returns

      `true` if the receiver object is equivalent to the argument; `false` otherwise.

    definition classes: AnyRef → Any

12. #### def expectedTestCount(filter: Filter): Int

    The total number of tests that are expected to run when this `Suite`'s `run` method is invoked.

    The total number of tests that are expected to run when this `Suite`'s `run` method is invoked.

    filter

      a `Filter` with which to filter tests to count based on their tags

    attributes: abstract
    definition classes: AbstractSuite

13. #### def finalize(): Unit

    This method is called by the garbage collector on the receiver object when garbage collection determines that there are no more references to the object.

    This method is called by the garbage collector on the receiver object when garbage collection determines that there are no more references to the object.

    The details of when and if the `finalize` method are invoked, as well as the interaction between `finalize`and non-local returns and exceptions, are all platform dependent.

    attributes: protected
    definition classes: AnyRef

14. #### def getClass(): java.lang.Class[_ <: java.lang.Object]

    Returns a representation that corresponds to the dynamic class of the receiver object.

    Returns a representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

      a representation that corresponds to the dynamic class of the receiver object.

    attributes: final
    definition classes: AnyRef

15. #### def hashCode(): Int

    Returns a hash code value for the object.

    Returns a hash code value for the object.

    The default hashing algorithm is platform dependent.

    Note that it is allowed for two objects to have identical hash codes (`o1.hashCode.equals(o2.hashCode)`) yet not be equal (`o1.equals(o2)` returns `false`). A degenerate implementation could always return `0`. However, it is required that if two objects are equal (`o1.equals(o2)` returns `true`) that they have identical hash codes (`o1.hashCode.equals(o2.hashCode)`). Therefore, when overriding this method, be sure to verify that the behavior is consistent with the `equals` method.

    returns

      the hash code value for the object.

    definition classes: AnyRef → Any

16. #### def isInstanceOf[T0]: Boolean

    This method is used to test whether the dynamic type of the receiver object is `T0`.

    This method is used to test whether the dynamic type of the receiver object is `T0`.

    Note that the test result of the test is modulo Scala's erasure semantics. Therefore the expression`1.isInstanceOf[String]` will return `false`, while the expression `List(1).isInstanceOf[List[String]]` will return `true`. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested typed.

    returns

      `true` if the receiver object is an instance of erasure of type `T0`; `false` otherwise.

    attributes: final
    definition classes: Any

17. #### def ne(arg0: AnyRef): Boolean

    `o.ne(arg0)` is the same as `!(o.eq(arg0))`.

    `o.ne(arg0)` is the same as `!(o.eq(arg0))`.

    arg0

      the object to compare against this object for reference dis-equality.

    returns

      `false` if the argument is not a reference to the receiver object; `true` otherwise.

    attributes: final
    definition classes: AnyRef

18. #### def nestedSuites: List[Suite]

    A `List` of this `Suite` object's nested `Suite`s.

    A `List` of this `Suite` object's nested `Suite`s. If this `Suite` contains no nested `Suite`s, this method returns an empty `List`.

    attributes: abstract
    definition classes: AbstractSuite

19. #### def newInstance: Suite

    Construct a new instance of this `Suite`.

    Construct a new instance of this `Suite`.

    This trait's implementation of `runTests` invokes this method to create a new instance of this `Suite` for each test. This trait's implementation of this method uses reflection to call `this.getClass.newInstance`. This approach will succeed only if this `Suite`'s class has a public, no-arg constructor. In most cases this is likely to be true, because to be instantiated by ScalaTest's `Runner` a `Suite` needs a public, no-arg constructor. However, this will not be true of any `Suite` defined as an inner class of another class or trait, because every constructor of an inner class type takes a reference to the enclosing instance. In such cases, and in cases where a `Suite` class is explicitly defined without a public, no-arg constructor, you will need to override this method to construct a new instance of the `Suite` in some other way.

    Here's an example of how you could override `newInstance` to construct a new instance of an inner class:

        import org.scalatest.Suiteclass Outer {
          class InnerSuite extends Suite with OneInstancePerTest {
            def testOne() {}
            def testTwo() {}
            override def newInstance = new InnerSuite
          }
        }

    definition classes: OneInstancePerTest

20. #### def notify(): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    attributes: final
    definition classes: AnyRef

21. #### def notifyAll(): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    attributes: final
    definition classes: AnyRef

22. #### def run(testName: Option[String], reporter: Reporter, stopper: Stopper, filter: Filter, configMap: Map[String, Any], distributor: Option[Distributor], tracker: Tracker): Unit

    Runs this suite of tests.

    Runs this suite of tests.

    testName

      an optional name of one test to execute. If `None`, all relevant tests should be executed. I.e., `None` acts like a wildcard that means execute all relevant tests in this `Suite`.

    reporter

      the `Reporter` to which results will be reported

    stopper

      the `Stopper` that will be consulted to determine whether to stop execution early.

    filter

      a `Filter` with which to filter tests based on their tags

    configMap

      a `Map` of key-value pairs that can be used by the executing `Suite` of tests.

    distributor

      an optional `Distributor`, into which to put nested `Suite`s to be executed by another entity, such as concurrently by a pool of threads. If `None`, nested `Suite`s will be executed sequentially.

    tracker

      a `Tracker` tracking `Ordinal`s being fired by the current thread.

    attributes: abstract
    definition classes: AbstractSuite

23. #### def runNestedSuites(reporter: Reporter, stopper: Stopper, filter: Filter, configMap: Map[String, Any], distributor: Option[Distributor], tracker: Tracker): Unit

    Runs zero to many of this suite's nested suites.

    Runs zero to many of this suite's nested suites.

    reporter

      the `Reporter` to which results will be reported

    stopper

      the `Stopper` that will be consulted to determine whether to stop execution early.

    filter

      a `Filter` with which to filter tests based on their tags

    configMap

      a `Map` of key-value pairs that can be used by the executing `Suite` of tests.

    distributor

      an optional `Distributor`, into which to put nested `Suite`s to be run by another entity, such as concurrently by a pool of threads. If `None`, nested `Suite`s will be run sequentially.

    tracker

      a `Tracker` tracking `Ordinal`s being fired by the current thread.

    attributes: protected abstract
    definition classes: AbstractSuite

24. #### def runTest(testName: String, reporter: Reporter, stopper: Stopper, configMap: Map[String, Any], tracker: Tracker): Unit

    Runs a test.

    Runs a test.

    testName

      the name of one test to execute.

    reporter

      the `Reporter` to which results will be reported

    stopper

      the `Stopper` that will be consulted to determine whether to stop execution early.

    configMap

      a `Map` of key-value pairs that can be used by the executing `Suite` of tests.

    tracker

      a `Tracker` tracking `Ordinal`s being fired by the current thread.

    attributes: protected abstract
    definition classes: AbstractSuite

25. #### def runTests(testName: Option[String], reporter: Reporter, stopper: Stopper, filter: Filter, configMap: Map[String, Any], distributor: Option[Distributor], tracker: Tracker): Unit

    Run the tests of this suite in parallel.

    Run the tests of this suite in parallel.

    testName

      an optional name of one test to run. If `None`, all relevant tests should be run. I.e., `None` acts like a wildcard that means run all relevant tests in this `Suite`.

    reporter

      the `Reporter` to which results will be reported

    stopper

      the `Stopper` that will be consulted to determine whether to stop execution early.

    filter

      a `Filter` with which to filter tests based on their tags

    configMap

      a `Map` of key-value pairs that can be used by the executing `Suite` of tests.

    distributor

      an optional `Distributor`, into which to put nested `Suite`s to be run by another entity, such as concurrently by a pool of threads. If `None`, nested `Suite`s will be run sequentially.

    tracker

      a `Tracker` tracking `Ordinal`s being fired by the current thread.

    attributes: protected
    definition classes: ParallelTestExecution → OneInstancePerTest → AbstractSuite

26. #### def synchronized[T0](arg0: T0): T0

    attributes: final
    definition classes: AnyRef

27. #### def tags: Map[String, Set[String]]

    A `Map` whose keys are `String` tag names with which tests in this `Suite` are marked, and whose values are the `Set` of test names marked with each tag.

    A `Map` whose keys are `String` tag names with which tests in this `Suite` are marked, and whose values are the `Set` of test names marked with each tag. If this `Suite` contains no tags, this method returns an empty `Map`.

    Subclasses may implement this method to define and/or discover tags in a custom manner, but overriding method implementations should never return an empty `Set` as a value. If a tag has no tests, its name should not appear as a key in the returned `Map`.

    attributes: abstract
    definition classes: AbstractSuite

28. #### def testNames: Set[String]

    An `Set` of test names.

    An `Set` of test names. If this `Suite` contains no tests, this method returns an empty `Set`.

    Although subclass and subtrait implementations of this method may return a `Set` whose iterator produces `String`test names in a well-defined order, the contract of this method does not required a defined order. Subclasses are free to implement this method and return test names in either a defined or undefined order.

    attributes: abstract
    definition classes: AbstractSuite

29. #### def toString(): String

    Returns a string representation of the object.

    Returns a string representation of the object.

    The default representation is platform dependent.

    returns

      a string representation of the object.

    definition classes: AnyRef → Any

30. #### def wait(): Unit

    attributes: final
    definition classes: AnyRef

31. #### def wait(arg0: Long, arg1: Int): Unit

    attributes: final
    definition classes: AnyRef

32. #### def wait(arg0: Long): Unit

    attributes: final
    definition classes: AnyRef

33. #### def withFixture(test: NoArgTest): Unit

    Runs the passed test function with a fixture established by this method.

    Runs the passed test function with a fixture established by this method.

    This method should set up the fixture needed by the tests of the current suite, invoke the test function, and if needed, perform any clean up needed after the test completes. Because the `NoArgTest` function passed to this method takes no parameters, preparing the fixture will require side effects, such as reassigning instance `var`s in this `Suite` or initializing a globally accessible external database. If you want to avoid reassigning instance `var`s you can use FixtureSuite.

    test

      the no-arg test function to run with a fixture

    attributes: protected abstract
    definition classes: AbstractSuite