Hello all! I've been busy with JRuby 9k but I have some work I want to do in MRI codebase. Some of you may know that JRuby runs MRI's test suite in addition to RubySpec, Rubicon, and our own suites. I have a few changes I'm hoping to make to tests and I wanted to make sure they sounded ok. 1. Refactoring some large test methods to be separate smaller methods. JRuby excludes from our suite any test methods we don't currently pass, so we can maintain a "high water mark" of compatibility. Unfortunately, many methods we exclude only fail a single assertion, and as a result we miss out on good assertions. I would like to start refactoring some of these larger methods into smaller test methods that test only a few things. An example would be test_array.rb's test_permutation. The only assertion that fails is the subprocess trying to permute a very large array. Logically, that could go in a test_permutation_large_array and be a separate test, because it's rather different than the previous assertions because it's testing a failure case rather than a success case. Other cases in that method might warrant separate bodies, like test_permutation_block, test_permutation_bug3708, and so on. 2. Adding "excludes" support to test/lib's test/unit Up until MRI 2.2, JRuby used minitest-excludes to exclude failing tests. This allows us to mask on a per-method basis using a simple directory hierarchy that maps to the test classes. https://github.com/jruby/jruby/tree/master/test/mri/excludes With the changes to test/unit and minitest in 2.2 stdlib, we can no longer use minitest-excludes. It is not compatible with minitest 5, and the suite bundles its own testing frameworks now. I added excludes support to JRuby's copy of MRI's test/lib. The code is not particularly large, and it has let us again run the MRI suite incrementally. Here's a diff of our changes to test/lib: https://gist.github.com/headius/84731230ede769fdce5d Some changes are to disable MRI specific APIs, like those used for leakchecker. I'd like to make those conditional in the suite. The EINVAL change is covered by #10494. The rest is the small amount of code needed for minitest-style excludes to work. I'd like to incorporate it. It does not have any effect on the suite if unused, but it would make merging MRI's tests into JRuby simpler for us. *** That's what I have for now. Sorry this is a bit long...feel free to ask me to clarify anything. - Charlie