org.junit.runners
Class BlockJUnit4ClassRunner

java.lang.Object
  org.junit.runner.Runner
      org.junit.runners.ParentRunner<FrameworkMethod>
          org.junit.runners.BlockJUnit4ClassRunner

All Implemented Interfaces:

Describable, Filterable, Sortable

Direct Known Subclasses:

BlockJUnit4ClassRunnerWithParameters, JUnit4, Theories

public class BlockJUnit4ClassRunner
extends ParentRunner<FrameworkMethod>

Implements the JUnit 4 standard test case class model, as defined by the annotations in the org.junit package. Many users will never notice this class: it is now the default test class runner, but it should have exactly the same behavior as the old test class runner (JUnit4ClassRunner).

BlockJUnit4ClassRunner has advantages for writers of custom JUnit runners that are slight changes to the default behavior, however:

• It has a much simpler implementation based on Statements, allowing new operations to be inserted into the appropriate point in the execution flow.
• It is published, and extension and reuse are encouraged, whereas JUnit4ClassRunner was in an internal package, and is now deprecated.

In turn, in 2009 we introduced Rules. In many cases where extending BlockJUnit4ClassRunner was necessary to add new behavior, Rules can be used, which makes the extension more reusable and composable.

Since:

4.5

Constructor Summary

BlockJUnit4ClassRunner(Class<?> klass)
Creates a BlockJUnit4ClassRunner to run klass

Method Summary

protected void	collectInitializationErrors(List<Throwable> errors) Adds to errors a throwable for each problem noted with the test class (available from ParentRunner.getTestClass()).
protected List<FrameworkMethod>	computeTestMethods() Returns the methods that run tests.
protected Object	createTest() Returns a new fixture for running a test.
protected Description	describeChild(FrameworkMethod method) Returns a Description for child, which can be assumed to be an element of the list returned by ParentRunner.getChildren()
protected List<FrameworkMethod>	getChildren() Returns a list of objects that define the children of this Runner.
protected List<TestRule>	getTestRules(Object target)
protected boolean	isIgnored(FrameworkMethod child) Evaluates whether FrameworkMethods are ignored based on the Ignore annotation.
protected Statement	methodBlock(FrameworkMethod method) Returns a Statement that, when executed, either returns normally if method passes, or throws an exception if method fails.
protected Statement	methodInvoker(FrameworkMethod method, Object test) Returns a Statement that invokes method on test
protected Statement	possiblyExpectingExceptions(FrameworkMethod method, Object test, Statement next) Returns a Statement: if method's @Test annotation has the expecting attribute, return normally only if next throws an exception of the correct type, and throw an exception otherwise.
protected List<MethodRule>	rules(Object target)
protected void	runChild(FrameworkMethod method, RunNotifier notifier) Runs the test corresponding to child, which can be assumed to be an element of the list returned by ParentRunner.getChildren().
protected String	testName(FrameworkMethod method) Returns the name that describes method for Descriptions.
protected void	validateConstructor(List<Throwable> errors) Adds to errors if the test class has more than one constructor, or if the constructor takes parameters.
protected void	validateFields(List<Throwable> errors)
protected void	validateInstanceMethods(List<Throwable> errors) Deprecated.
protected void	validateNoNonStaticInnerClass(List<Throwable> errors)
protected void	validateOnlyOneConstructor(List<Throwable> errors) Adds to errors if the test class has more than one constructor (do not override)
protected void	validateTestMethods(List<Throwable> errors) Adds to errors for each method annotated with @Testthat is not a public, void instance method with no arguments.
protected void	validateZeroArgConstructor(List<Throwable> errors) Adds to errors if the test class's single constructor takes parameters (do not override)
protected Statement	withAfters(FrameworkMethod method, Object target, Statement statement) Returns a Statement: run all non-overridden @After methods on this class and superclasses before running next; all After methods are always executed: exceptions thrown by previous steps are combined, if necessary, with exceptions from After methods into a MultipleFailureException.
protected Statement	withBefores(FrameworkMethod method, Object target, Statement statement) Returns a Statement: run all non-overridden @Before methods on this class and superclasses before running next; if any throws an Exception, stop execution and pass the exception on.
protected Statement	withPotentialTimeout(FrameworkMethod method, Object test, Statement next) Deprecated.

Methods inherited from class org.junit.runners.ParentRunner

childrenInvoker, classBlock, classRules, createTestClass, filter, getDescription, getName, getRunnerAnnotations, getTestClass, run, runLeaf, setScheduler, sort, validatePublicVoidNoArgMethods, withAfterClasses, withBeforeClasses

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

BlockJUnit4ClassRunner

public BlockJUnit4ClassRunner(Class<?> klass)
                       throws InitializationError

Creates a BlockJUnit4ClassRunner to run klass

Throws:

InitializationError - if the test class is malformed.

Method Detail

runChild

protected void runChild(FrameworkMethod method,
                        RunNotifier notifier)

Description copied from class: ParentRunner

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

Specified by:

runChild in class ParentRunner<FrameworkMethod>

isIgnored

protected boolean isIgnored(FrameworkMethod child)

Evaluates whether FrameworkMethods are ignored based on the Ignore annotation.

Overrides:

isIgnored in class ParentRunner<FrameworkMethod>

describeChild

protected Description describeChild(FrameworkMethod method)

Description copied from class: ParentRunner

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

Specified by:

describeChild in class ParentRunner<FrameworkMethod>

getChildren

protected List<FrameworkMethod> getChildren()

Description copied from class: ParentRunner

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

Specified by:

getChildren in class ParentRunner<FrameworkMethod>

computeTestMethods

protected List<FrameworkMethod> computeTestMethods()

Returns the methods that run tests. Default implementation returns all methods annotated with @Test on this class and superclasses that are not overridden.

collectInitializationErrors

protected void collectInitializationErrors(List<Throwable> errors)

Description copied from class: ParentRunner

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

Overrides:

collectInitializationErrors in class ParentRunner<FrameworkMethod>

validateNoNonStaticInnerClass

protected void validateNoNonStaticInnerClass(List<Throwable> errors)

validateConstructor

protected void validateConstructor(List<Throwable> errors)

Adds to errors if the test class has more than one constructor, or if the constructor takes parameters. Override if a subclass requires different validation rules.

validateOnlyOneConstructor

protected void validateOnlyOneConstructor(List<Throwable> errors)

Adds to errors if the test class has more than one constructor (do not override)

validateZeroArgConstructor

protected void validateZeroArgConstructor(List<Throwable> errors)

Adds to errors if the test class's single constructor takes parameters (do not override)

validateInstanceMethods

@Deprecated
protected void validateInstanceMethods(List<Throwable> errors)

Deprecated.

Adds to errors for each method annotated with @Test, @Before, or @After that is not a public, void instance method with no arguments.

validateFields

protected void validateFields(List<Throwable> errors)

validateTestMethods

protected void validateTestMethods(List<Throwable> errors)

Adds to errors for each method annotated with @Testthat is not a public, void instance method with no arguments.

createTest

protected Object createTest()
                     throws Exception

Returns a new fixture for running a test. Default implementation executes the test class's no-argument constructor (validation should have ensured one exists).

Throws:

Exception

testName

protected String testName(FrameworkMethod method)

Returns the name that describes method for Descriptions. Default implementation is the method's name

methodBlock

protected Statement methodBlock(FrameworkMethod method)

Returns a Statement that, when executed, either returns normally if method passes, or throws an exception if method fails. Here is an outline of the default implementation:

• Invoke method on the result of createTest(), and throw any exceptions thrown by either operation.
• HOWEVER, if method's @Test annotation has the expecting attribute, return normally only if the previous step threw an exception of the correct type, and throw an exception otherwise.
• HOWEVER, if method's @Test annotation has the timeout attribute, throw an exception if the previous step takes more than the specified number of milliseconds.
• ALWAYS run all non-overridden @Before methods on this class and superclasses before any of the previous steps; if any throws an Exception, stop execution and pass the exception on.
• ALWAYS run all non-overridden @After methods on this class and superclasses after any of the previous steps; all After methods are always executed: exceptions thrown by previous steps are combined, if necessary, with exceptions from After methods into a MultipleFailureException.
• ALWAYS allow @Rule fields to modify the execution of the above steps. A Rule may prevent all execution of the above steps, or add additional behavior before and after, or modify thrown exceptions. For more information, see TestRule

This can be overridden in subclasses, either by overriding this method, or the implementations creating each sub-statement.

methodInvoker

protected Statement methodInvoker(FrameworkMethod method,
                                  Object test)

Returns a Statement that invokes method on test

possiblyExpectingExceptions

protected Statement possiblyExpectingExceptions(FrameworkMethod method,
                                                Object test,
                                                Statement next)

Returns a Statement: if method's @Test annotation has the expecting attribute, return normally only if next throws an exception of the correct type, and throw an exception otherwise.

withPotentialTimeout

@Deprecated
protected Statement withPotentialTimeout(FrameworkMethod method,
                                                    Object test,
                                                    Statement next)

Deprecated.

Returns a Statement: if method's @Test annotation has the timeout attribute, throw an exception if next takes more than the specified number of milliseconds.

withBefores

protected Statement withBefores(FrameworkMethod method,
                                Object target,
                                Statement statement)

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

withAfters

protected Statement withAfters(FrameworkMethod method,
                               Object target,
                               Statement statement)

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

rules

protected List<MethodRule> rules(Object target)

Parameters:

target - the test case instance

Returns:

a list of MethodRules that should be applied when executing this test

getTestRules

protected List<TestRule> getTestRules(Object target)

Parameters:

target - the test case instance

Returns:

a list of TestRules that should be applied when executing this test