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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; to be precise, it binds stdin and stdout to the ports provided by the 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. After running the test program, by default with-dummy-user 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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