Rspec controller test

Great Hi to everybody!
I am currently working on a project which tests the controllers using rspec.
I came across some methods in the controller which do not generate any actions at all. However, they still need testing! Some of these methods do require parameters. I am wondering how I can pass the test cases as the parameters to these targeted methods in the controller spec?? Below is a simple example for illustration:
in the controller:
def method_for_test(parameter_1, parameter_2)
    #do some coding
    #no action
end

in the controller_spec:
it "should test the method_for_test" do
    parameter_1
    parameter_2
    ??how to pass them to method_for_test
end

Thank you all in advance.