[SUREFIRE-1103] The total amount of threads are not used with test classes nested by Enclosed.class.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 2.16, 2.17
• Component/s: Junit 4.7+ (parallel) support
• Environment: JDK 7 on Linux ; JUnit 4.11
• Assignee: Tibor Digana
• Reporter: Miyata Jumpei
• Created: 01/Oct/14 01:21
• Updated: 02/Oct/14 03:33
• Resolved: 02/Oct/14 03:33

Description

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.

<plugin>
  <artifactId>maven-surefire-plugin</artifactId>
  <version>2.17</version>
  <configuration>
    <parallel>classes</parallel>
    <threadCount>4</threadCount>
    <perCoreThreadCount>false</perCoreThreadCount>
  </configuration>
</plugin>

And, create 4 test classes like the following.

@RunWith(Enclosed.class)
public class Test {

    public static class InnerTest {
        @Test
        public void test1() throws InterruptedException {
            Thread.sleep(1000l);
        }
    }

}

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.