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:
http://www.junitmax.com/junitmax/subscribe.html
Example:
public static class TwoUnEqualTests { @Test public void slow() throws InterruptedException { Thread.sleep(100); fail(); } @Test public void fast() { fail(); } } @Test public void rememberOldRuns() { File maxFile = new File("history.max"); MaxCore firstMax = MaxCore.storedLocally(maxFile); firstMax.run(TwoUnEqualTests.class); MaxCore useHistory= MaxCore.storedLocally(maxFile); List<Failure> failures= useHistory.run(TwoUnEqualTests.class) .getFailures(); assertEquals("fast", failures.get(0).getDescription().getMethodName()); assertEquals("slow", failures.get(1).getDescription().getMethodName()); }
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.
Example:
public static class Example { @Test public void one() throws InterruptedException { Thread.sleep(1000); } @Test public void two() throws InterruptedException { Thread.sleep(1000); } } @Test public void testsRunInParallel() { long start= System.currentTimeMillis(); Result result= JUnitCore.runClasses(ParallelComputer.methods(), Example.class); assertTrue(result.wasSuccessful()); long end= System.currentTimeMillis(); assertThat(end - start, betweenInclusive(1000, 1500)); }
Arrays of doubles can be compared, using a delta allowance for equality:
@Test public void doubleArraysAreEqual() { assertArrayEquals(new double[] {1.0, 2.0}, new double[] {1.0, 2.0}, 0.01); }
Filter.matchDescription
APISince 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.
junit-4.x.zip now contains build.xml