Under Minitest 5 (or a Rails 4.1 project), you will get a warning
MiniTest::Unit::TestCase is now Minitest::Test.
when you attempt to run tests. This is because shoulda-matchers requires
'test/unit/testcase', even if Test::Unit is not being used.
It is not a good idea for shoulda-matchers to require *anything* that
the user may not be using, whether it's Test::Unit or RSpec. We should
assume that by the time shoulda-matchers is required, the user has
already required all of whatever test framework they are using, not none
or even some of that framework.
