The JUnit sampler is saving results in the CSV log labeled with the "Constructor String Label" instead of the "Name". All other samplers use the Name field, so this is inconsistent (and problematic because my constructor has commas in it). I think this is happening in JUnitSampler::sample (line 333 in v2.2).
Fixed in SVN. Will appear in next nightly build in: http://people.apache.org/builds/jakarta-jmeter/nightly/
This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/1857