The ActionPack tests are borked. Unrelated tests affect each other.
For proof, try removing the "unless defined?" clause around Customer
in the beginning of actionpack/tests/controllers/render_test.rb. It
is actually using the incompatible definition from new_render_test.rb
because of the order in which the tests are performed. However, the
order is different on other platforms, so the "unless defined?" is
really only hiding the problem from most users.
I hate to be a bother, but this really needs attention. I'd gladly
fix it if someone were to suggest how this particular issue should be
fixed. It scares me that unrelated tests can influence each other's
results. These are either poorly-written test files that break some
fundamental rules of testing, or the test suite itself should be fixed
to prevent this sort of thing from happening. Yes, we need to test
Here's my original ticket: http://dev.rubyonrails.org/ticket/8849