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#!r6rs
(library (aps test-utils)
(export catch-error test run-tests runner run)
(import (rnrs) (aps compat) (sweet-macros))
;; helper macro
(def-syntax (catch-error body body* ...)
#'(let*
((error-message #f)
(result
(guard (err ;; as a side effect, set! the error message if any
((or (assertion-violation? err) (error? err))
(set! error-message (condition-message err))))
body body* ...)))
(if error-message error-message
(error 'catch-error "Expected error, got none!"
'(body body* ...) '=> result))))
;; test macro
(def-syntax (test description expr expected)
#'(lambda (cmd)
(case cmd
((descr) description)
((values) (list expected expr 'expr))
((run) (equal? expr expected))
(else (error 'test "Invalid command" cmd)))))
;; four helper functions
(define (print-nothing descr expected evalued-expr expr)
(display ""))
(define (print-dot descr expected evalued-expr expr)
(display "."))
(define (print-msg descr expected evalued-expr expr)
(printf "\n~s failed\nExpected ~s, got ~s\nExpression was ~a\n"
descr expected evalued-expr expr))
(define (print-stats successes failures)
(define total (+ successes failures))
(printf "\nRun ~a tests. ~a passed, ~a failed\n" total successes failures))
;; full runner
(define (run-tests print-success print-failure . tests)
(let loop ((tests tests) (success 0) (failure 0))
(if (null? tests)
(list success failure)
(let* ((test1 (car tests))
(descr (test1 'descr)) (vals (test1 'values)))
(if (test1 'run)
(begin; the test succeeded
(apply print-success descr vals)
(loop (cdr tests) (+ 1 success) failure))
(begin; the test failed
(apply print-failure descr vals)
(loop (cdr tests) success (+ 1 failure))))))))
;; runner factory
(define (runner print-success print-failure print-stats)
(lambda tests
(define succ-fail (apply run-tests print-success print-failure tests))
(apply print-stats succ-fail)))
;; default runner
(define run (runner print-dot print-msg print-stats))
)
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