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Summary of Changes in version 4.6


JUnit now includes a new experimental Core, MaxCore. MaxCore remembers the results of previous test runs in order to run new tests out of order. MaxCore prefers new tests to old tests, fast tests to slow tests, and recently failing tests to tests that last failed long ago. There's currently not a standard UI for running MaxCore included in JUnit, but there is a UI included in the JUnit Max Eclipse plug-in at:


public static class TwoUnEqualTests {
	public void slow() throws InterruptedException {

	public void fast() {

public void rememberOldRuns() {
	File maxFile = new File("history.max");
	MaxCore firstMax = MaxCore.storedLocally(maxFile);;

	MaxCore useHistory= MaxCore.storedLocally(maxFile);
	List<Failure> failures=
	assertEquals("fast", failures.get(0).getDescription().getMethodName());
	assertEquals("slow", failures.get(1).getDescription().getMethodName());

Test scheduling strategies

JUnitCore now includes an experimental method that allows you to specify a model of the Computer that runs your tests. Currently, the only built-in Computers are the default, serial runner, and two runners provided in the ParallelRunner class: ParallelRunner.classes(), which runs classes in parallel, and ParallelRunner.methods(), which runs classes and methods in parallel.

This feature is currently less stable than MaxCore, and may be merged with MaxCore in some way in the future.


public static class Example {
	@Test public void one() throws InterruptedException {
	@Test public void two() throws InterruptedException {

@Test public void testsRunInParallel() {
	long start= System.currentTimeMillis();
	Result result= JUnitCore.runClasses(ParallelComputer.methods(),
	long end= System.currentTimeMillis();
	assertThat(end - start, betweenInclusive(1000, 1500));

Comparing double arrays

Arrays of doubles can be compared, using a delta allowance for equality:

public void doubleArraysAreEqual() {
	assertArrayEquals(new double[] {1.0, 2.0}, new double[] {1.0, 2.0}, 0.01);

Filter.matchDescription API

Since 4.0, it has been possible to run a single method using the Request.method API. In 4.6, the filter that implements this is exposed as Filter.matchDescription.


  • A couple classes and packages that once had empty javadoc have been doc'ed.

  • Added how to run JUnit from the command line to the cookbook.

  • now contains build.xml

Bug fixes

  • Fixed overly permissive @DataPoint processing (2191102)
  • Fixed bug in test counting after an ignored method (2106324)