BlockJUnit4ClassRunner (JUnit API)

org.junit.runners Class BlockJUnit4ClassRunner

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

所有已实现接口:

Describable, Filterable, Sortable

已知直接子类:

JUnit4

public class BlockJUnit4ClassRunner

extends ParentRunner<org.junit.runners.model.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.

BlockJUnit4ClassRunner

public BlockJUnit4ClassRunner(Class<?> klass)
                       throws org.junit.runners.model.InitializationError

Creates a BlockJUnit4ClassRunner to run klass

抛出异常:

org.junit.runners.model.InitializationError - if the test class is malformed.

runChild

protected void runChild(org.junit.runners.model.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

规范说明:

runChild in class ParentRunner<org.junit.runners.model.FrameworkMethod>

describeChild

protected Description describeChild(org.junit.runners.model.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()

规范说明:

describeChild in class ParentRunner<org.junit.runners.model.FrameworkMethod>

getChildren

protected List<org.junit.runners.model.FrameworkMethod> getChildren()

Description copied from class: ParentRunner

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

规范说明:

getChildren in class ParentRunner<org.junit.runners.model.FrameworkMethod>

computeTestMethods

protected List<org.junit.runners.model.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.

重写:

collectInitializationErrors in class ParentRunner<org.junit.runners.model.FrameworkMethod>

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. unused API, will go away in future version

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

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).

抛出异常:

Exception

testName

protected String testName(org.junit.runners.model.FrameworkMethod method)

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

methodBlock

protected org.junit.runners.model.Statement methodBlock(org.junit.runners.model.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 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 MethodRule
• 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.

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

methodInvoker

protected org.junit.runners.model.Statement methodInvoker(org.junit.runners.model.FrameworkMethod method,
                                                          Object test)

Returns a Statement that invokes method on test

possiblyExpectingExceptions

@Deprecated
protected org.junit.runners.model.Statement possiblyExpectingExceptions(org.junit.runners.model.FrameworkMethod method,
                                                                                   Object test,
                                                                                   org.junit.runners.model.Statement next)

Deprecated. Will be private soon: use Rules instead

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 org.junit.runners.model.Statement withPotentialTimeout(org.junit.runners.model.FrameworkMethod method,
                                                                            Object test,
                                                                            org.junit.runners.model.Statement next)

Deprecated. Will be private soon: use Rules instead

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

@Deprecated
protected org.junit.runners.model.Statement withBefores(org.junit.runners.model.FrameworkMethod method,
                                                                   Object target,
                                                                   org.junit.runners.model.Statement statement)

Deprecated. Will be private soon: use Rules instead

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

@Deprecated
protected org.junit.runners.model.Statement withAfters(org.junit.runners.model.FrameworkMethod method,
                                                                  Object target,
                                                                  org.junit.runners.model.Statement statement)

Deprecated. Will be private soon: use Rules instead

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<org.junit.rules.MethodRule> rules(Object test)

返回:

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