BeforeAndAfterEachTestData

Stackable trait that can be mixed into suites that need code that makes use of test data (test name, tags, config map, etc.) executed before and/or after running each test.

Recommended Usage: Use trait BeforeAndAfterEachTestData when you want to stack traits that perform side-effects before and/or after tests, rather than at the beginning or end of tests, when you need access to any test data (such as the config map) in the before and/or after code. Note: For more insight into where BeforeAndAfterEachTestData fits into the big picture, see the Shared fixtures section in the documentation for your chosen style trait.

A test fixture is composed of the objects and other artifacts (files, sockets, database connections, etc.) tests use to do their work. When multiple tests need to work with the same fixtures, it is important to try and avoid duplicating the fixture code across those tests. The more code duplication you have in your tests, the greater drag the tests will have on refactoring the actual production code. Trait BeforeAndAfterEachTestData offers one way to eliminate such code duplication: a beforeEach(TestData) method that will be run before each test (like JUnit's setUp), and an afterEach(TestData) method that will be run after (like JUnit's tearDown).

Here's an example:

package org.scalatest.examples.flatspec.composingbeforeandaftereachtestdata

import org.scalatest._
import collection.mutable.ListBuffer

trait Builder extends BeforeAndAfterEachTestData { this: Suite =>

  val builder = new StringBuilder

  override def beforeEach(td: TestData) {
    builder.append(td.name)
    super.beforeEach(td) // To be stackable, must call super.beforeEach(TestData)
  }

  override def afterEach(td: TestData) {
    try {
      super.afterEach(td) // To be stackable, must call super.afterEach(TestData)
    }
    finally {
      builder.clear()
    }
  }
}

trait Buffer extends BeforeAndAfterEachTestData { this: Suite =>

  val buffer = new ListBuffer[String]

  override def afterEach(td: TestData) {
    try {
      super.afterEach(td) // To be stackable, must call super.afterEach(TestData)
    }
    finally {
      buffer.clear()
    }
  }
}

class ExampleSpec extends FlatSpec with Builder with Buffer {

  "Testing" should "be easy" in {
    builder.append("!")
    assert(builder.toString === "Testing should be easy!")
    assert(buffer.isEmpty)
    buffer += "sweet"
  }

  it should "be fun" in {
    builder.append("!")
    assert(builder.toString === "Testing should be fun!")
    assert(buffer.isEmpty)
    buffer += "clear"
  }
}

To get the same ordering as withFixture, place your super.beforeEach(TestData) call at the end of each beforeEach(TestData) method, and the super.afterEach(TestData) call at the beginning of each afterEach(TestData) method, as shown in the previous example. It is a good idea to invoke super.afterEach(TestData) in a try block and perform cleanup in a finally clause, as shown in the previous example, because this ensures the cleanup code is performed even if super.afterEach(TestData) throws an exception.

Besides enabling trait stacking, the other main advantage of BeforeAndAfterEachTestData over BeforeAndAfter is that BeforeAndAfterEachTestData allows you to make use of test data (such as the test name and config map) in your before and/or after code, whereas BeforeAndAfter does not.

The main disadvantage of BeforeAndAfterEachTestData compared to BeforeAndAfter and BeforeAndAfterEach is that BeforeAndAfterEachTestData requires more boilerplate. If you don't need trait stacking or access to the test data, use BeforeAndAfter instead of BeforeAndAfterEachTestData. If you need trait stacking, but not access to the TestData, use BeforeAndAfterEach instead.

Self Type: BeforeAndAfterEachTestData with Suite

Linear Supertypes

SuiteMixin, AnyRef, Any

Abstract Value Members

abstract 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

Definition Classes
SuiteMixin
abstract def nestedSuites: IndexedSeq[Suite]

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

Definition Classes
SuiteMixin
abstract def rerunner: Option[String]

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

Definition Classes
SuiteMixin
abstract def run(testName: Option[String], args: Args): Status

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.
args
the Args for this run
returns
a Status object that indicates when all tests and nested suites started by this method have completed, and whether or not a failure occurred.

Definition Classes
SuiteMixin
Exceptions thrown
NullPointerException
if any passed parameter is null.
abstract def runNestedSuites(args: Args): Status

Runs zero to many of this suite's nested suites.
Runs zero to many of this suite's nested suites.
args
the Args for this run
returns
a Status object that indicates when all nested suites started by this method have completed, and whether or not a failure occurred.

Attributes
protected
Definition Classes
SuiteMixin
Exceptions thrown
NullPointerException
if args is null.
abstract def runTests(testName: Option[String], args: Args): Status

Runs zero to many of this suite's tests.
Runs zero to many of this suite's tests.
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.
args
the Args for this run
returns
a Status object that indicates when all tests started by this method have completed, and whether or not a failure occurred.

Attributes
protected
Definition Classes
SuiteMixin
Exceptions thrown
NullPointerException
if either testName or args is null.
abstract val styleName: String

This suite's style name.
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.

Definition Classes
SuiteMixin
abstract def suiteId: String

A string ID for this Suite that is intended to be unique among all suites reported during a run.
A string ID for this Suite that is intended to be unique among all suites reported during a run.
The suite ID is intended to be unique, because ScalaTest does not enforce that it is unique. If it is not unique, then you may not be able to uniquely identify a particular test of a particular suite. This ability is used, for example, to dynamically tag tests as having failed in the previous run when rerunning only failed tests.
returns
this Suite object's ID.

Definition Classes
SuiteMixin
abstract def suiteName: String

A user-friendly suite name for this Suite.
A user-friendly suite name for this Suite.
This trait's implementation of this method returns the simple name of this object's class. This trait's implementation of runNestedSuites calls this method to obtain a name for Reports to pass to the suiteStarting, suiteCompleted, and suiteAborted methods of the Reporter.
returns
this Suite object's suite name.

Definition Classes
SuiteMixin
abstract 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.

Definition Classes
SuiteMixin
abstract def testDataFor(testName: String, theConfigMap: ConfigMap): TestData

Provides a TestData instance for the passed test name, given the passed config map.
Provides a TestData instance for the passed test name, given the passed config map.
This method is used to obtain a TestData instance to pass to withFixture(NoArgTest) and withFixture(OneArgTest) and the beforeEach and afterEach methods of trait BeforeAndAfterEach.
testName
the name of the test for which to return a TestData instance
theConfigMap
the config map to include in the returned TestData
returns
a TestData instance for the specified test, which includes the specified config map

Definition Classes
SuiteMixin
abstract def testNames: Set[String]

A Set of test names.
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.

Definition Classes
SuiteMixin
abstract def withFixture(test: (BeforeAndAfterEachTestData.this)#NoArgTest): Outcome

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 initializing an external database.
test
the no-arg test function to run with a fixture

Attributes
protected
Definition Classes
SuiteMixin

Concrete Value Members

final def !=(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def !=(arg0: Any): Boolean

Definition Classes
Any
final def ##(): Int

Definition Classes
AnyRef → Any
final def ==(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def ==(arg0: Any): Boolean

Definition Classes
Any
def afterEach(testData: TestData): Unit

Defines a method (that takes a TestData) to be run after each of this suite's tests.
Defines a method (that takes a TestData) to be run after each of this suite's tests.
This trait's implementation of runTest invokes this method after running each test (passing in a TestData containing the configMap passed to it), thus this method can be used to tear down a test fixture needed by each test. This trait's implementation of this method does nothing.

Attributes
protected
final def asInstanceOf[T0]: T0

Definition Classes
Any
def beforeEach(testData: TestData): Unit

Defines a method (that takes a TestData) to be run before each of this suite's tests.
Defines a method (that takes a TestData) to be run before each of this suite's tests.
This trait's implementation of runTest invokes this method before running each test (passing in a TestData that includes the configMap passed to it), thus this method can be used to set up a test fixture needed by each test. This trait's implementation of this method does nothing.

Attributes
protected
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws()
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def equals(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws()
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
def hashCode(): Int

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
def runTest(testName: String, args: Args): Status

Run a test surrounded by calls to beforeEach and afterEach.
Run a test surrounded by calls to beforeEach and afterEach.
This trait's implementation of this method ("this method") invokes beforeEach(TestData) before running each test and afterEach(TestData) after running each test. It runs each test by invoking super.runTest, passing along the two parameters passed to it.
If any invocation of beforeEach(TestData) completes abruptly with an exception, this method will complete abruptly with the same exception. If any call to super.runTest completes abruptly with an exception, this method will complete abruptly with the same exception, however, before doing so, it will invoke afterEach(TestData). If afterEach(TestData) also completes abruptly with an exception, this method will nevertheless complete abruptly with the exception previously thrown by super.runTest. If super.runTest returns normally, but afterEach(TestData) completes abruptly with an exception, this method will complete abruptly with the exception thrown by afterEach(TestData).
testName
the name of one test to run.
args
the Args for this run
returns
a Status object that indicates when the test started by this method has completed, and whether or not it failed .

Attributes
protected
Definition Classes
BeforeAndAfterEachTestData → SuiteMixin
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def toString(): String

Definition Classes
AnyRef → Any
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws()
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws()
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws()

trait BeforeAndAfterEachTestData extends SuiteMixin

Abstract Value Members

abstract def expectedTestCount(filter: Filter): Int

abstract def nestedSuites: IndexedSeq[Suite]

abstract def rerunner: Option[String]

abstract def run(testName: Option[String], args: Args): Status

abstract def runNestedSuites(args: Args): Status

abstract def runTests(testName: Option[String], args: Args): Status

abstract val styleName: String

abstract def suiteId: String

abstract def suiteName: String

abstract def tags: Map[String, Set[String]]

abstract def testDataFor(testName: String, theConfigMap: ConfigMap): TestData

abstract def testNames: Set[String]

abstract def withFixture(test: (BeforeAndAfterEachTestData.this)#NoArgTest): Outcome

Concrete Value Members

final def !=(arg0: AnyRef): Boolean

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: AnyRef): Boolean

final def ==(arg0: Any): Boolean

def afterEach(testData: TestData): Unit

final def asInstanceOf[T0]: T0

def beforeEach(testData: TestData): Unit

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

def runTest(testName: String, args: Args): Status

final def synchronized[T0](arg0: ⇒ T0): T0

def toString(): String

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

Inherited from SuiteMixin

Inherited from AnyRef

Inherited from Any

Ungrouped