rake error

I haven't looked into it in any depth, but I wonder if your problem
could be that your test classes have exactly the same name. So when
the second file is loaded, you will be modifying the first test class.

I suspect you *can* have two test cases testing the same controller as
long as the class names of the two *TestCases* are different.

class SummaryControllerOneTest < Test::Unit::TestCase
class SummaryControllerAnotherTest < Test::Unit::TestCase