ActionPack 2.3.9 form_helper_test fails when run "rake test"

I'm unable to get a successful run of the ActionPack 2.3.9 tests. I'm running REE 1.8.7. Here's a gist showing the failures:

The failing test "form_helper_test" passes fine on its own, but fails when running "rake test". Digging into this a bit, it seems related to how the Post class is defined in 2 different unit tests: "record_tag_helper" and "form_tag_helper" causing conflicts depending on which test gets which version of the class. I'm able to reproduce the problem by running the two relevant tests in one test run. The run fails (with different errors) in either order you place those tests.

Is anyone else experiencing these failures?