org.scalatest

OneInstancePerTest

trait OneInstancePerTest extends AbstractSuite

Trait that facilitates a style of testing in which each test is run in its own instance of the suite class to isolate each test from the side effects of the other tests in the suite.

If you mix this trait into a Suite, you can initialize shared reassignable fixture variables as well as shared mutable fixture objects in the constructor of the class. Because each test will run in its own instance of the class, each test will get a fresh copy of the instance variables. This is the approach to test isolation taken, for example, by the JUnit framework.

Here's an example of OneInstancePerTest being used in a FunSuite:

import org.scalatest.FunSuite
import org.scalatest.OneInstancePerTest
import collection.mutable.ListBuffer

class MySuite extends FunSuite with OneInstancePerTest {

  val builder = new StringBuilder("ScalaTest is ")
  val buffer = new ListBuffer[String]

  test("easy") {
    builder.append("easy!")
    assert(builder.toString === "ScalaTest is easy!")
    assert(buffer.isEmpty)
    buffer += "sweet"
  }

  test("fun") {
    builder.append("fun!")
    assert(builder.toString === "ScalaTest is fun!")
    assert(buffer.isEmpty)
  }
}

Self Type
OneInstancePerTest with Suite
Linear Supertypes
AbstractSuite, AnyRef, Any
Known Subclasses
FreeSpec, FunSpec, ParallelTestExecution
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  1. OneInstancePerTest
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Abstract Value Members

  1. 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

  2. def nestedSuites : List[Suite]

    A List of this Suite object's nested Suites.

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

    Attributes
    abstract
    Definition Classes
    AbstractSuite

  3. 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 Suites to be executed by another entity, such as concurrently by a pool of threads. If None, nested Suites will be executed sequentially.

    tracker

    a Tracker tracking Ordinals being fired by the current thread.

    Attributes
    abstract
    Definition Classes
    AbstractSuite

  4. 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 Suites to be run by another entity, such as concurrently by a pool of threads. If None, nested Suites will be run sequentially.

    tracker

    a Tracker tracking Ordinals being fired by the current thread.

    Attributes
    protected abstract
    Definition Classes
    AbstractSuite

  5. 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 Ordinals being fired by the current thread.

    Attributes
    protected abstract
    Definition Classes
    AbstractSuite

  6. val styleName : String

    Suite style name.

    Suite style name.

    Attributes
    abstract
    Definition Classes
    AbstractSuite

  7. 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

  8. 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

  9. 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 vars in this Suite or initializing a globally accessible external database. If you want to avoid reassigning instance vars you can use fixture.Suite.

    test

    the no-arg test function to run with a fixture

    Attributes
    protected abstract
    Definition Classes
    AbstractSuite

Concrete Value Members

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

    Attributes
    final
    Definition Classes
    AnyRef

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

    Attributes
    final
    Definition Classes
    Any

  3. def ## (): Int

    Attributes
    final
    Definition Classes
    AnyRef → Any

  4. def == (arg0: AnyRef): Boolean

    Attributes
    final
    Definition Classes
    AnyRef

  5. def == (arg0: Any): Boolean

    Attributes
    final
    Definition Classes
    Any

  6. def asInstanceOf [T0] : T0

    Attributes
    final
    Definition Classes
    Any

  7. def clone (): AnyRef

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()

  8. def eq (arg0: AnyRef): Boolean

    Attributes
    final
    Definition Classes
    AnyRef

  9. def equals (arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  10. def finalize (): Unit

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()

  11. def getClass (): java.lang.Class[_]

    Attributes
    final
    Definition Classes
    AnyRef

  12. def hashCode (): Int

    Definition Classes
    AnyRef → Any

  13. def isInstanceOf [T0] : Boolean

    Attributes
    final
    Definition Classes
    Any

  14. def ne (arg0: AnyRef): Boolean

    Attributes
    final
    Definition Classes
    AnyRef

  15. 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.Suite

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

  16. def notify (): Unit

    Attributes
    final
    Definition Classes
    AnyRef

  17. def notifyAll (): Unit

    Attributes
    final
    Definition Classes
    AnyRef

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

    Run this Suite's tests each in their own instance of this Suite's class.

    Run this Suite's tests each in their own instance of this Suite's class.

    If the passed testName is None, this trait's implementation of this method will for each test name returned by testNames, invoke newInstance to get a new instance of this Suite, and call run on it, passing in the test name wrapped in a Some. If the passed testName is defined, this trait's implementation of this method will simply forward all passed parameters to super.run. If the invocation of either newInstance on this Suite or run on a newly created instance of this Suite completes abruptly with an exception, then this runTests method will complete abruptly with the same exception.

    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 Suites to be run by another entity, such as concurrently by a pool of threads. If None, nested Suites will be run sequentially.

    tracker

    a Tracker tracking Ordinals being fired by the current thread.

    Attributes
    protected
    Definition Classes
    OneInstancePerTest → AbstractSuite

  19. def synchronized [T0] (arg0: ⇒ T0): T0

    Attributes
    final
    Definition Classes
    AnyRef

  20. def toString (): String

    Definition Classes
    AnyRef → Any

  21. def wait (): Unit

    Attributes
    final
    Definition Classes
    AnyRef
    Annotations
    @throws()

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

    Attributes
    final
    Definition Classes
    AnyRef
    Annotations
    @throws()

  23. def wait (arg0: Long): Unit

    Attributes
    final
    Definition Classes
    AnyRef
    Annotations
    @throws()

Inherited from AbstractSuite

Inherited from AnyRef

Inherited from Any