How to identify slow unit tests when using maven-surefire-plugin in parallel mode?

Question

With a view to managing / reducing our build times, I want to identify which unit tests are taking the most time - in a parallel test environment using the maven-suref

Answer 1

Adding to the Maven Surefire Plugin configuration the reportFormat entry and setting its value to plain (instead of the default brief) would give you elapsed time per method.

    
        
            org.apache.maven.plugins
            maven-surefire-plugin
            2.19
            
                -Xmx2G -XX:MaxPermSize=1G -XX:-UseSplitVerifier
                false
                classesAndMethods
                true
                plain
            
        
    

Output with default reportFormat (brief):

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.sample.mocking.InternalServiceTestCase
Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.241 sec - in com.sample.mocking.InternalServiceTestCase

Output with plain value:

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.sample.mocking.InternalServiceTestCase
Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.187 sec - in com.sample.mocking.InternalServiceTestCase
test(com.sample.mocking.InternalServiceTestCase)  Time elapsed: 0.005 sec
mockTest(com.sample.mocking.InternalServiceTestCase)  Time elapsed: 0.17 sec
mockTestFailureTollerance(com.sample.mocking.InternalServiceTestCase)  Time elapsed: 0.007 sec
mockProcessfile(com.sample.mocking.InternalServiceTestCase)  Time elapsed: 0.003 sec

This option may give you further details on tests and execution time.