ParallelTestExecution

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

An immutable IndexedSeq of this SuiteMixin object's nested Suites. If this SuiteMixin contains no nested Suites, this method returns an empty IndexedSeq.

The fully qualified name of the class that can be used to rerun this suite.

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

This suite's style name.

This lifecycle method provides a string that is used to determine whether this suite object's style is one of the chosen styles for the project.

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.

A 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.

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 initializing an external database.

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.Suite

class Outer {
  class InnerSuite extends Suite with ParallelTestExecution {
    def testOne() {}
    def testTwo() {}
    override def newInstance = new InnerSuite
  }
}

Modifies the behavior of super.run to facilitate parallel test execution.

This trait's implementation of this method only changes the supertrait implementation if both testName and args.distributedTestSorter are defined. If either testName or args.distributedTestSorter is empty, it simply invokes super.run, passing along the same testName and args object.

If both testName and args.distributedTestSorter are defined, however, this trait's implementation of this method will create a "test-specific reporter" whose apply method will invoke the apply method of the DistributedTestSorter, which takes a test name as well as the event. It will then invoke super.run passing along the same testName and an Args object that is the same except with the original reporter replaced by the test-specific reporter.

Modifies the behavior of super.runTest to facilitate parallel test execution.

This trait's implementation of this method only changes the supertrait implementation if args.distributor is defined. If args.distributor is empty, it simply invokes super.runTests, passing along the same testName and args object.

If args.distributor is defined, then it uses the args.runTestInNewInstance flag to decide what to do. If runTestInNewInstance is true, this is the general instance responsible for running all tests, so it first notifies args.distributedTestSorter (if defined) that it is distributing this test by invoking distributingTest on it, passing in the testName. Then it wraps a new instance of this class, obtained by invoking newInstance in a suite whose run method will ensure that only the test whose name was passed to this method as testName is executed. Finally, this trait's implementation of this method submits this wrapper suite to the distributor.

If runTestInNewInstance is false, this is the test-specific (distributed) instance, so this trait's implementation of this method simply invokes super.runTest, passing along the same testName and args object, delegating responsibility for actually running the test to the super implementation. After super.runTest returns (or completes abruptly by throwing an exception), it notifies args.distributedTestSorter (if defined) that it has completed running the test by invoking completedTest on it, passing in the testName.

Note: this trait's implementation of this method is final to ensure that any other desired runTest behavior is executed by the same thread that executes the test. For example, if you were to mix in BeforeAndAfter after ParallelTestExecution, the before and after code would be executed by the general instance on the main test thread, rather than by the test-specific instance on the distributed thread. Marking this method final ensures that traits like BeforeAndAfter can only be "super" to ParallelTestExecution and, therefore, that its before and after code will be run by the same distributed thread that runs the test itself.

Modifies the behavior of super.runTests to facilitate parallel test execution.

This trait's implementation of this method always invokes super.runTests to delegate to OneInstancePerTest's implementation, but it may pass in a modified args object. If args.runTestInNewInstance is false and args.distributor is defined, this trait's implementation of this method will wrap the passed args.reporter in a new Reporter that can sort events fired by parallel tests back into sequential order, with a timeout. It will pass this new reporter to super.runTests (in args.reporter) as well as a defined DistributedTestSorter (in args.distributedTestSorter) that can be used to communicate with the sorting reporter. Otherwise, if args.runTestInNewInstance is true or args.distributor is empty, this trait's implementation of this method simply calls super.runTests, passing along the same testName and args.

A maximum amount of time to wait for out-of-order events generated by running the tests of this Suite in parallel while sorting the events back into a more user-friendly, sequential order.

The default implementation of this method returns the value specified via -T to Runner, or 2 seconds, if no -T was supplied.