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<h2>Summary of Changes in version 4.6</h2>
<p>JUnit now includes a new experimental Core, <code>MaxCore</code>. <code>MaxCore</code>
remembers the results of previous test runs in order to run new
tests out of order. <code>MaxCore</code> 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
<code>MaxCore</code> included in JUnit, but there is a UI included in the JUnit
Max Eclipse plug-in at:</p>
<pre><code>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&lt;Failure&gt; failures=
assertEquals("fast", failures.get(0).getDescription().getMethodName());
assertEquals("slow", failures.get(1).getDescription().getMethodName());
<h3>Test scheduling strategies</h3>
<p><code>JUnitCore</code> now includes an experimental method that allows you to
specify a model of the <code>Computer</code> that runs your tests. Currently,
the only built-in Computers are the default, serial runner, and two
runners provided in the <code>ParallelRunner</code> class:
<code>ParallelRunner.classes()</code>, which runs classes in parallel, and
<code>ParallelRunner.methods()</code>, which runs classes and methods in parallel.</p>
<p>This feature is currently less stable than MaxCore, and may be
merged with MaxCore in some way in the future.</p>
<pre><code>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));
<h3>Comparing double arrays</h3>
<p>Arrays of doubles can be compared, using a delta allowance for equality:</p>
public void doubleArraysAreEqual() {
assertArrayEquals(new double[] {1.0, 2.0}, new double[] {1.0, 2.0}, 0.01);
<h3><code>Filter.matchDescription</code> API</h3>
<p>Since 4.0, it has been possible to run a single method using the <code>Request.method</code>
API. In 4.6, the filter that implements this is exposed as <code>Filter.matchDescription</code>.</p>
<li><p>A couple classes and packages that once had empty javadoc have been
<li><p>Added how to run JUnit from the command line to the cookbook.</p></li>
<li><p> now contains build.xml</p></li>
<h3>Bug fixes</h3>
<li>Fixed overly permissive @DataPoint processing (2191102)</li>
<li>Fixed bug in test counting after an ignored method (2106324)</li>
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