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Simulates user input for testing interactive command-line programs.
make-dummy-user[procedure] (make-dummy-user STRINGS)
Given a list of strings representing a sequence of user input, this procedure returns a DUMMY-USER closure, which responds to the following messages:
(USER 'input) (USER 'output)
These calls return, respectively, an input and an output port. Generally you do not need to use them directly; they are used by with-dummy-user to rebind stdin and stdout.
Resets the dummy user to its initial state, allowing repeated tests with the same data.
Returns a list of all data received from and sent to the test program, in the form '((program: STRING) (user: STRING) ...).
with-dummy-user[procedure] (with-dummy-user USER THUNK [RETURN-RESULT])
Tests a program with a dummy user. The USER argument should be a closure such as that produced by make-dummy-user. THUNK is a procedure of no arguments that runs the program you wish to test, with stdin and stdout bound to the ports provided by USER. By default, this procedure calls (USER 'dump) and returns the result of that call. However, you may provide your own RETURN-RESULT procedure (with 0 arguments) to cause other data to be returned (e.g. the inputs collected by your program).
(use dummy-user) (define my-results #f) (define (test-prog) (let ((collected-data (make-queue))) (display "Name: ") (queue-add! collected-data (cons 'name (read-line))) (display "Age: ") (queue-add! collected-data (cons 'age (read-line))) (display "Phone: ") (queue-add! collected-data (cons 'phone (read-line))) (print "OK, thanks!") collected-data)) (define my-dummy (make-dummy-user '("Jenny" "24" "867-5309"))) (pp (with-dummy-user my-dummy test-prog)) ;;; Should print: ((program: "Name: ") (user: "Jenny") (program: "Age: ") (user: "24") ;;; (program: "Phone: ") (user: "867-5309") (program: "OK, Thanks!") (program: "\n")) (my-dummy 'reset) (pp (with-dummy-user my-dummy (lambda () (set! my-results (test-prog))) (lambda () (queue->list my-results)))) ;;; Should print: ((name . "Jenny") (age . "24") (phone . "867-5309"))
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