The Gecko profiler appears to have no tests. At least, I landed a change that caused it to reliably crash at start-up on Win64 and it took aklotz to notice it (see bug 1120126). Some kind of basic smoke test to detect major bustage like this would be nice.
We have a verity of tests for the backend. We have GTest unit test (part of the motivation for me introducing it), mochitest and xpcshell which provide integrations test. Unless you want to make this more specific there's nothing useful to be done here. But right now Win64 is not supported by the profiler because of a lack of resources.
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