org.junit.runners.model
Class RunnerBuilder

java.lang.Object
  org.junit.runners.model.RunnerBuilder

public abstract class RunnerBuilder
extends Object

A RunnerBuilder is a strategy for constructing runners for classes. Only writers of custom runners should use RunnerBuilders. A custom runner class with a constructor taking a RunnerBuilder parameter will be passed the instance of RunnerBuilder used to build that runner itself. For example, imagine a custom runner that builds suites based on a list of classes in a text file:

 \@RunWith(TextFileSuite.class)
 \@SuiteSpecFile("mysuite.txt")
 class MySuite {}
 

The implementation of TextFileSuite might include:

 public TextFileSuite(Class testClass, RunnerBuilder builder) {
   // ...
   for (String className : readClassNames())
     addRunner(builder.runnerForClass(Class.forName(className)));
   // ...
 }
 

Since:

4.5

See Also:

Suite

Constructor Summary

RunnerBuilder()

Method Summary

abstract Runner	runnerForClass(Class<?> testClass) Override to calculate the correct runner for a test class at runtime.
List<Runner>	runners(Class<?> parent, Class<?>[] children) Constructs and returns a list of Runners, one for each child class in children.
List<Runner>	runners(Class<?> parent, List<Class<?>> children)
Runner	safeRunnerForClass(Class<?> testClass) Always returns a runner for the given test class.

Methods inherited from class java.lang.Object

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

Constructor Detail

RunnerBuilder

public RunnerBuilder()

Method Detail

runnerForClass

public abstract Runner runnerForClass(Class<?> testClass)
                               throws Throwable

Override to calculate the correct runner for a test class at runtime.

Parameters:

testClass - class to be run

Returns:

a Runner

Throws:

Throwable - if a runner cannot be constructed

safeRunnerForClass

public Runner safeRunnerForClass(Class<?> testClass)

Always returns a runner for the given test class.

In case of an exception a runner will be returned that prints an error instead of running tests.

Note that some of the internal JUnit implementations of RunnerBuilder will return null from this method, but no RunnerBuilder passed to a Runner constructor will return null from this method.

Parameters:

testClass - class to be run

Returns:

a Runner

runners

public List<Runner> runners(Class<?> parent,
                            Class<?>[] children)
                     throws InitializationError

Constructs and returns a list of Runners, one for each child class in children. Care is taken to avoid infinite recursion: this builder will throw an exception if it is requested for another runner for parent before this call completes.

Throws:

InitializationError

runners

public List<Runner> runners(Class<?> parent,
                            List<Class<?>> children)
                     throws InitializationError

Throws:

InitializationError