(defmacro call-being-tested [call-form expected-result]
  "Creates a map that contains a function-ized version of the form being 
   tested, an expected result, and the file position to refer to in case of 
   failure. See 'expect'."
   `{:function-under-test (fn [] ~call-form)
     :expected-result ~expected-result
     :expected-result-text-for-failures '~expected-result
     :file-position (user-file-position)})