ParentRunner (JUnit API)

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, create a composite Description, and run children sequentially.

Constructor Summary

Constructors
Modifier Constructor and Description

protected ParentRunner(java.lang.Class<?> testClass)
Constructs a new ParentRunner that will run @TestClass

Constructors
Modifier	Constructor and Description
`protected`	`ParentRunner(java.lang.Class<?> testClass)` Constructs a new `ParentRunner` that will run `@TestClass`

Method Summary

Methods
Modifier and Type	Method and Description
`protected org.junit.runners.model.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 org.junit.runners.model.Statement`	`classBlock(RunNotifier notifier)` Constructs a `Statement` to run all of the tests in the test class.
`protected void`	`collectInitializationErrors(java.util.List<java.lang.Throwable> errors)` Adds to `errors` a throwable for each problem noted with the test class (available from `getTestClass()`).
`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 java.util.List<T>`	`getChildren()` Returns a list of objects that define the children of this Runner.
`Description`	`getDescription()`
`protected java.lang.String`	`getName()` Returns a name used to describe this Runner
`protected org.junit.runners.model.TestClass`	`getTestClass()` Returns a `TestClass` object wrapping the class to be executed.
`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()`.
`void`	`sort(Sorter sorter)` Sorts the tests using `sorter`
`protected void`	`validatePublicVoidNoArgMethods(java.lang.Class<? extends java.lang.annotation.Annotation> annotation, boolean isStatic, java.util.List<java.lang.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 org.junit.runners.model.Statement`	`withAfterClasses(org.junit.runners.model.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 org.junit.runners.model.Statement`	`withBeforeClasses(org.junit.runners.model.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(java.lang.Class<?> testClass)
                throws org.junit.runners.model.InitializationError
```
    Constructs a new ParentRunner that will run @TestClass
    
    Throws:
    
    org.junit.runners.model.InitializationError
- Method Detail
  - getChildren
```
protected abstract java.util.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(java.util.List<java.lang.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(java.lang.Class<? extends java.lang.annotation.Annotation> annotation,
                                  boolean isStatic,
                                  java.util.List<java.lang.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 org.junit.runners.model.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:
    - Call runChild(Object, RunNotifier) on each object returned by getChildren() (subject to any imposed filter and sort).
    - ALWAYS run all non-overridden @BeforeClass methods on this class and superclasses before the previous step; if any throws an Exception, stop execution and pass the exception on.
    - ALWAYS run all non-overridden @AfterClass methods on this class and superclasses before any of the previous steps; all AfterClass methods are always executed: exceptions thrown by previous steps are combined, if necessary, with exceptions from AfterClass methods into a MultipleFailureException.
    Parameters:
    notifier -
    
    Returns:
    Statement
  - withBeforeClasses
```
protected org.junit.runners.model.Statement withBeforeClasses(org.junit.runners.model.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 org.junit.runners.model.Statement withAfterClasses(org.junit.runners.model.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.
  - childrenInvoker
```
protected org.junit.runners.model.Statement childrenInvoker(RunNotifier notifier)
```
    Returns a Statement: Call runChild(Object, RunNotifier) on each object returned by getChildren() (subject to any imposed filter and sort)
  - getName
```
protected java.lang.String getName()
```
    Returns a name used to describe this Runner
  - getTestClass
```
protected final org.junit.runners.model.TestClass getTestClass()
```
    Returns a TestClass object wrapping the class to be executed.
  - 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

Class ParentRunner<T>

Constructor Summary

Method Summary

Methods inherited from class org.junit.runner.Runner

Methods inherited from class java.lang.Object

Constructor Detail

ParentRunner

Method Detail

getChildren

describeChild

runChild

collectInitializationErrors

validatePublicVoidNoArgMethods

classBlock

withBeforeClasses

withAfterClasses

childrenInvoker

getName

getTestClass

getDescription

run

filter

sort