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I have made four of each type of cake. 23.
max delivers fast feedback, running the tests most likely to fail first. you only have to pay close attention to test results for a second (literally) before getting back to coding, even if you have a (literally) before getting back to coding, even if you have a long-running test suite.
press release detailing the re-launch of junit max.
screencast of junit max in action from jason gorman.
feel free to join the conversation on the junit max mailing list.
max's optimizing runner works because of two convenient facts:
test run times generally follow a power law distribution--lots of very short tests and a few very long ones. this means that by running the short tests first you can get most of the feedback in a fraction of the runtime of the whole suite (assuming test failures aren't correlated with test run length, which i haven't verified yet).
failures are not randomly distributed. a test that failed recently is more likely to fail than one that has run correctly a bazillion times in a row. by putting recently failed (and newly written) tests first in the queue, you maximize the information density of that critical first second of feedback (before you get distracted and go check twitter).