rails testing - undefined method `request='

Problem:

test_some_functional_test_case(SomeFunctionalControllerTest):
NoMethodError: undefined method `request=' for #<SomeMispeltFunctionalController:0x7f5b55bd0a58>

Solution:
Basically it means you haven't required the controllers file. Or you have a typo in the name that is instantiating the a non controller for the @controller variable in the test.