Runner (JUnit API)

java.lang.Object
- org.junit.runner.Runner

All Implemented Interfaces:

Describable

Direct Known Subclasses:

org.junit.internal.runners.JUnit38ClassRunner, ParentRunner
```
public abstract class Runner
extends java.lang.Object
implements Describable
```
A Runner runs tests and notifies a RunNotifier of significant events as it does so. You will need to subclass Runner when using RunWith to invoke a custom runner. When creating a custom runner, in addition to implementing the abstract methods here you must also provide a constructor that takes as an argument the Class containing the tests.
The default runner implementation guarantees that the instances of the test case class will be constructed immediately before running the test and that the runner will retain no reference to the test case instances, generally making them available for garbage collection.

Since:

4.0

See Also:

Description, RunWith

Constructor Summary

Constructors
Constructor Description

Runner()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`abstract Description`	`getDescription()`
`abstract void`	`run(RunNotifier notifier)`	Run the tests for this runner.
`int`	`testCount()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Runner
```
public Runner()
```
- Method Detail
  - getDescription
```
public abstract Description getDescription()
```
    Specified by:
    
    getDescription in interface Describable
    
    Returns:
    
    a Description showing the tests to be run by the receiver
  - run
```
public abstract void run(RunNotifier notifier)
```
    Run the tests for this runner.
    
    Parameters:
    
    notifier - will be notified of events while tests are being run--tests being started, finishing, and failing
  - testCount
```
public int testCount()
```
    Returns:
    
    the number of tests to be run by the receiver