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https://jira.codehaus.org/browse/SUREFIRE-1103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=353536#comment-353536
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Tibor Digana commented on SUREFIRE-1103:
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ok, but the "Test" is in reality a suite.
If you have 4xTest, where each of them has only one nested "InnerTest", then
you should use <parallel>suites</parallel> (since of 2.16).
This is a little misunderstanding between suites and classes.
In 2.15 you had classes and methods in the configuration, but in reality it
meant parent and child.
This means that parallel=classes is running suites instead of real TestCase as
a class.
On the other side more worse, parallel=methods run a child of Suite which is
obviously TestCase class and not the methods of every individual TestCase class.
Since of 2.16, this was fixed with real meaning, and you have to more precisely
say what you want to run in parallel:
suites
classes
methods
suitesAndClasses
suitesAndMethods
classesAndMethods
Similar with threadCount, can be any of or combination of:
threadCount
threadCountSuites
threadCountClasses
threadCountMethods
Read the spec
http://maven.apache.org/surefire/maven-surefire-plugin/test-mojo.html
> The total amount of threads are not used with test classes nested by
> Enclosed.class.
> ------------------------------------------------------------------------------------
>
> Key: SUREFIRE-1103
> URL: https://jira.codehaus.org/browse/SUREFIRE-1103
> Project: Maven Surefire
> Issue Type: Bug
> Components: Junit 4.7+ (parallel) support
> Affects Versions: 2.16, 2.17
> Environment: JDK 7 on Linux
> JUnit 4.11
> Reporter: Miyata Jumpei
>
> It seems that the total amount of threads are not used with test classes
> nested by Enclosed.class.
> For example, I created a project with the following setting.
> {code}
> <plugin>
> <artifactId>maven-surefire-plugin</artifactId>
> <version>2.17</version>
> <configuration>
> <parallel>classes</parallel>
> <threadCount>4</threadCount>
> <perCoreThreadCount>false</perCoreThreadCount>
> </configuration>
> </plugin>
> {code}
> And, create 4 test classes like the following.
> {code}
> @RunWith(Enclosed.class)
> public class Test {
> public static class InnerTest {
> @Test
> public void test1() throws InterruptedException {
> Thread.sleep(1000l);
> }
> }
> }
> {code}
> It takes 4 seconds to execute the 4 tests.
> With 2.15, it takes only 1 second.
> It seems that the outer tests are not parallelly-processed until all inner
> tests are processed.
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