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## Summary of Changes in version 4.6 ##
### Max ###
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());
}
### 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.
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));
}
### Comparing double arrays ###
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` 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`.
### Documentation ###
- 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
### Bug fixes ###
- Fixed overly permissive @DataPoint processing (2191102)
- Fixed bug in test counting after an ignored method (2106324)
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