# File lib/rr/double_definitions/strategies/double_injection/any_instance_of.rb, line 19
          def do_call
            if !double_definition_create.no_subject? && !double_definition_create.subject.is_a?(Class)
              raise ArgumentError, "instance_of only accepts class objects"
            end
            double_injection = Injections::DoubleInjection.find_or_create(subject, method_name)
            Double.new(double_injection, definition)
          end