Package org.junit.runners

Class ParentRunner<T>

java.lang.Object

org.junit.runner.Runner

org.junit.runners.ParentRunner<T>

All Implemented Interfaces:

Describable, Filterable, Sortable

Direct Known Subclasses:

BlockJUnit4ClassRunner, Suite

public abstract class ParentRunner<T>
extends Runner
implements Filterable, Sortable

Provides most of the functionality specific to a Runner that implements a "parent node" in the test tree, with children defined by objects of some data type T. (For BlockJUnit4ClassRunner, T is Method . For Suite, T is Class.) Subclasses must implement finding the children of the node, describing each child, and running each child. ParentRunner will filter and sort children, handle @BeforeClass and @AfterClass methods, handle annotated ClassRules, create a composite Description, and run children sequentially.

Since:

4.5

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ParentRunner(Class<?> testClass)	Constructs a new ParentRunner that will run @TestClass

Method Summary

Modifier and Type	Method	Description
protected Statement	childrenInvoker(RunNotifier notifier)	Returns a Statement: Call runChild(Object, RunNotifier) on each object returned by getChildren() (subject to any imposed filter and sort)
protected Statement	classBlock(RunNotifier notifier)	Constructs a Statement to run all of the tests in the test class.
protected List<TestRule>	classRules()
protected void	collectInitializationErrors(List<Throwable> errors)	Adds to errors a throwable for each problem noted with the test class (available from getTestClass()).
protected TestClass	createTestClass(Class<?> testClass)
protected abstract Description	describeChild(T child)	Returns a Description for child, which can be assumed to be an element of the list returned by getChildren()
void	filter(Filter filter)	Remove tests that don't pass the parameter filter.
protected abstract List<T>	getChildren()	Returns a list of objects that define the children of this Runner.
Description	getDescription()
protected String	getName()	Returns a name used to describe this Runner
protected Annotation[]	getRunnerAnnotations()
TestClass	getTestClass()	Returns a TestClass object wrapping the class to be executed.
protected boolean	isIgnored(T child)	Evaluates whether a child is ignored.
void	run(RunNotifier notifier)	Run the tests for this runner.
protected abstract void	runChild(T child, RunNotifier notifier)	Runs the test corresponding to child, which can be assumed to be an element of the list returned by getChildren().
protected void	runLeaf(Statement statement, Description description, RunNotifier notifier)	Runs a Statement that represents a leaf (aka atomic) test.
void	setScheduler(RunnerScheduler scheduler)	Sets a scheduler that determines the order and parallelization of children.
void	sort(Sorter sorter)	Sorts the tests using sorter
protected void	validatePublicVoidNoArgMethods(Class<? extends Annotation> annotation, boolean isStatic, List<Throwable> errors)	Adds to errors if any method in this class is annotated with annotation, but: is not public, or takes parameters, or returns something other than void, or is static (given isStatic is false), or is not static (given isStatic is true).
protected Statement	withAfterClasses(Statement statement)	Returns a Statement: run all non-overridden @AfterClass methods on this class and superclasses before executing statement; all AfterClass methods are always executed: exceptions thrown by previous steps are combined, if necessary, with exceptions from AfterClass methods into a MultipleFailureException.
protected Statement	withBeforeClasses(Statement statement)	Returns a Statement: run all non-overridden @BeforeClass methods on this class and superclasses before executing statement; if any throws an Exception, stop execution and pass the exception on.

Methods inherited from class org.junit.runner.Runner

testCount

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ParentRunner

protected ParentRunner(Class<?> testClass)
                throws InitializationError

Constructs a new ParentRunner that will run @TestClass

Throws:

InitializationError

Method Detail

createTestClass

protected TestClass createTestClass(Class<?> testClass)

getChildren

protected abstract List<T> getChildren()

Returns a list of objects that define the children of this Runner.

describeChild

protected abstract Description describeChild(T child)

Returns a Description for child, which can be assumed to be an element of the list returned by getChildren()

runChild

protected abstract void runChild(T child,
                                 RunNotifier notifier)

Runs the test corresponding to child, which can be assumed to be an element of the list returned by getChildren(). Subclasses are responsible for making sure that relevant test events are reported through notifier

collectInitializationErrors

protected void collectInitializationErrors(List<Throwable> errors)

Adds to errors a throwable for each problem noted with the test class (available from getTestClass()). Default implementation adds an error for each method annotated with @BeforeClass or @AfterClass that is not public static void with no arguments.

validatePublicVoidNoArgMethods

protected void validatePublicVoidNoArgMethods(Class<? extends Annotation> annotation,
                                              boolean isStatic,
                                              List<Throwable> errors)

Adds to errors if any method in this class is annotated with annotation, but:

• is not public, or
• takes parameters, or
• returns something other than void, or
• is static (given isStatic is false), or
• is not static (given isStatic is true).

classBlock

protected Statement classBlock(RunNotifier notifier)

Constructs a Statement to run all of the tests in the test class. Override to add pre-/post-processing. Here is an outline of the implementation:

1. Determine the children to be run using getChildren() (subject to any imposed filter and sort).
2. If there are any children remaining after filtering and ignoring, construct a statement that will:
   1. Apply all ClassRules on the test-class and superclasses.
   2. Run all non-overridden @BeforeClass methods on the test-class and superclasses; if any throws an Exception, stop execution and pass the exception on.
   3. Run all remaining tests on the test-class.
   4. Run all non-overridden @AfterClass methods on the test-class and superclasses: exceptions thrown by previous steps are combined, if necessary, with exceptions from AfterClass methods into a MultipleFailureException.

Returns:

Statement

withBeforeClasses

protected Statement withBeforeClasses(Statement statement)

Returns a Statement: run all non-overridden @BeforeClass methods on this class and superclasses before executing statement; if any throws an Exception, stop execution and pass the exception on.

withAfterClasses

protected Statement withAfterClasses(Statement statement)

Returns a Statement: run all non-overridden @AfterClass methods on this class and superclasses before executing statement; all AfterClass methods are always executed: exceptions thrown by previous steps are combined, if necessary, with exceptions from AfterClass methods into a MultipleFailureException.

classRules

protected List<TestRule> classRules()

Returns:

the ClassRules that can transform the block that runs each method in the tested class.

childrenInvoker

protected Statement childrenInvoker(RunNotifier notifier)

Returns a Statement: Call runChild(Object, RunNotifier) on each object returned by getChildren() (subject to any imposed filter and sort)

isIgnored

protected boolean isIgnored(T child)

Evaluates whether a child is ignored. The default implementation always returns false.

BlockJUnit4ClassRunner, for example, overrides this method to filter tests based on the Ignore annotation.

getName

protected String getName()

Returns a name used to describe this Runner

getTestClass

public final TestClass getTestClass()

Returns a TestClass object wrapping the class to be executed.

runLeaf

protected final void runLeaf(Statement statement,
                             Description description,
                             RunNotifier notifier)

Runs a Statement that represents a leaf (aka atomic) test.

getRunnerAnnotations

protected Annotation[] getRunnerAnnotations()

Returns:

the annotations that should be attached to this runner's description.

getDescription

public Description getDescription()

Specified by:

getDescription in interface Describable

Specified by:

getDescription in class Runner

Returns:

a Description showing the tests to be run by the receiver

run

public void run(RunNotifier notifier)

Description copied from class: Runner

Run the tests for this runner.

Specified by:

run in class Runner

Parameters:

notifier - will be notified of events while tests are being run--tests being started, finishing, and failing

filter

public void filter(Filter filter)
            throws NoTestsRemainException

Description copied from interface: Filterable

Remove tests that don't pass the parameter filter.

Specified by:

filter in interface Filterable

Parameters:

filter - the Filter to apply

Throws:

NoTestsRemainException - if all tests are filtered out

sort

public void sort(Sorter sorter)

Description copied from interface: Sortable

Sorts the tests using sorter

Specified by:

sort in interface Sortable

Parameters:

sorter - the Sorter to use for sorting the tests

setScheduler

public void setScheduler(RunnerScheduler scheduler)

Sets a scheduler that determines the order and parallelization of children. Highly experimental feature that may change.