The junit test report that lists all classes in a package shows duration 0secs
on all classes even if they took more than 0 seconds to complete.

This error can be seen in the clear case test pages. The test
hudson.plugins.clearcase.ClearCaseSCMTest.testBuildEnvVars() takes always at
least 2 seconds, which can be seen here:
http://hudson.ramfelt.se/job/Hudson/org.jvnet.hudson.plugins$clearcase/186/testReport/hudson.plugins.clearcase/ClearCaseSCMTest/

But the package list for hudson.plugins.clearcase shows 0 for the duration for
the ClearCaseSCMTest class, which can be seen here:
http://hudson.ramfelt.se/job/Hudson/org.jvnet.hudson.plugins$clearcase/186/testReport/hudson.plugins.clearcase/