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    copied!<p>Answering my own question:</p> <p>Netbeans runs the commands via ant, so in ${project_name}private/build-impl.xml are all the logic about project IDE commands.</p> <p>For execute the unit test, the IDE uses the junit ant's task:</p> <pre><code>&lt;macrodef name="junit" uri="http://www.netbeans.org/ns/j2se-project/3"&gt; &lt;attribute default="${includes}" name="includes"/&gt; &lt;attribute default="${excludes}" name="excludes"/&gt; &lt;attribute default="**" name="testincludes"/&gt; &lt;attribute default="" name="testmethods"/&gt; &lt;element name="customize" optional="true"/&gt; &lt;sequential&gt; &lt;property name="junit.forkmode" value="perTest"/&gt; &lt;junit dir="${work.dir}" errorproperty="tests.failed" failureproperty="tests.failed" fork="true" forkmode="${junit.forkmode}" showoutput="true" tempdir="${build.dir}"&gt; &lt;test methods="@{testmethods}" name="@{testincludes}" todir="${build.test.results.dir}"/&gt; &lt;syspropertyset&gt; &lt;propertyref prefix="test-sys-prop."/&gt; &lt;mapper from="test-sys-prop.*" to="*" type="glob"/&gt; &lt;/syspropertyset&gt; &lt;formatter type="brief" usefile="false"/&gt; &lt;formatter type="xml"/&gt; &lt;jvmarg value="-ea"/&gt; &lt;customize/&gt; &lt;/junit&gt; &lt;/sequential&gt; &lt;/macrodef&gt; </code></pre> <p>The interesting line is:</p> <pre><code>&lt;property name="junit.forkmode" value="perTest"/&gt; </code></pre> <p>From Junit Task documentation junit.forkmode:</p> <blockquote> <p>Controls how many Java Virtual Machines get created if you want to fork some tests. Possible values are "perTest" (the default), "perBatch" and "once". "once" creates only a single Java VM for all tests while "perTest" creates a new VM for each TestCase class. "perBatch" creates a VM for each nested and one collecting all nested s. Note that only tests with the same settings of filtertrace, haltonerror, haltonfailure, errorproperty and failureproperty can share a VM, so even if you set forkmode to "once", Ant may have to create more than a single Java VM. This attribute is ignored for tests that don't get forked into a new Java VM. since Ant 1.6.2</p> </blockquote> <p>Conclusion: Netbeans runs the junit test in forkMode=perTest, so it creates a new VM for each TestCase class, otherwise NewTestSuite only uses one VM. </p> <p>For more detail about forkMode=perTest: <a href="https://stackoverflow.com/questions/6254965/junit-impact-of-forkmode-once-on-test-correctness/6264198#6264198">junit: impact of forkMode=&quot;once&quot; on test correctness</a></p>
 

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