yaauie/embedded-mongo — comment on commit 5f019e5bea3cab02378adf0c0f3c3c0229d6ac4e
File: test/functional/interface_test.rb line 101
By gdb:

I believe the rest of the project uses parens in function declarations, i.e.

def assert_contained(hsh1, hsh2, additional_message=nil)