1 ;;;; test-suite/lib.scm --- generic support for testing
2 ;;;; Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
4 ;;;; This program is free software; you can redistribute it and/or modify
5 ;;;; it under the terms of the GNU General Public License as published by
6 ;;;; the Free Software Foundation; either version 2, or (at your option)
7 ;;;; any later version.
9 ;;;; This program is distributed in the hope that it will be useful,
10 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
11 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 ;;;; GNU General Public License for more details.
14 ;;;; You should have received a copy of the GNU General Public License
15 ;;;; along with this software; see the file COPYING. If not, write to
16 ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
17 ;;;; Boston, MA 02111-1307 USA
19 (define-module (test-suite lib)
20 :use-module (ice-9 stack-catch)
21 :use-module (ice-9 regex))
25 ;; Exceptions which are commonly being tested for.
26 exception:out-of-range exception:unbound-var
27 exception:wrong-num-args exception:wrong-type-arg
29 ;; Reporting passes and failures.
32 pass-if-exception expect-fail-exception
34 ;; Naming groups of tests in a regular fashion.
35 with-test-prefix with-test-prefix* current-test-prefix
37 ;; Reporting results in various ways.
38 register-reporter unregister-reporter reporter-registered?
39 make-count-reporter print-counts
46 ;;;; If you're using Emacs's Scheme mode:
47 ;;;; (put 'with-test-prefix 'scheme-indent-function 1)
52 ;;;; The function (run-test name expected-result thunk) is the heart of the
53 ;;;; testing environment. The first parameter NAME is a unique name for the
54 ;;;; test to be executed (for an explanation of this parameter see below under
55 ;;;; TEST NAMES). The second parameter EXPECTED-RESULT is a boolean value
56 ;;;; that indicates whether the corresponding test is expected to pass. If
57 ;;;; EXPECTED-RESULT is #t the test is expected to pass, if EXPECTED-RESULT is
58 ;;;; #f the test is expected to fail. Finally, THUNK is the function that
59 ;;;; actually performs the test. For example:
61 ;;;; (run-test "integer addition" #t (lambda () (= 2 (+ 1 1))))
63 ;;;; To report success, THUNK should either return #t or throw 'pass. To
64 ;;;; report failure, THUNK should either return #f or throw 'fail. If THUNK
65 ;;;; returns a non boolean value or throws 'unresolved, this indicates that
66 ;;;; the test did not perform as expected. For example the property that was
67 ;;;; to be tested could not be tested because something else went wrong.
68 ;;;; THUNK may also throw 'untested to indicate that the test was deliberately
69 ;;;; not performed, for example because the test case is not complete yet.
70 ;;;; Finally, if THUNK throws 'unsupported, this indicates that this test
71 ;;;; requires some feature that is not available in the configured testing
72 ;;;; environment. All other exceptions thrown by THUNK are considered as
76 ;;;; Convenience macros for tests expected to pass or fail
78 ;;;; * (pass-if name body) is a short form for
79 ;;;; (run-test name #t (lambda () body))
80 ;;;; * (expect-fail name body) is a short form for
81 ;;;; (run-test name #f (lambda () body))
85 ;;;; (pass-if "integer addition" (= 2 (+ 1 1)))
88 ;;;; Convenience macros to test for exceptions
90 ;;;; The following macros take exception parameters which are pairs
91 ;;;; (type . message), where type is a symbol that denotes an exception type
92 ;;;; like 'wrong-type-arg or 'out-of-range, and message is a string holding a
93 ;;;; regular expression that describes the error message for the exception
94 ;;;; like "Argument .* out of range".
96 ;;;; * (pass-if-exception name exception body) will pass if the execution of
97 ;;;; body causes the given exception to be thrown. If no exception is
98 ;;;; thrown, the test fails. If some other exception is thrown, is is an
100 ;;;; * (expect-fail-exception name exception body) will pass unexpectedly if
101 ;;;; the execution of body causes the given exception to be thrown. If no
102 ;;;; exception is thrown, the test fails expectedly. If some other
103 ;;;; exception is thrown, it is an error.
108 ;;;; Every test in the test suite has a unique name, to help
109 ;;;; developers find tests that are failing (or unexpectedly passing),
110 ;;;; and to help gather statistics.
112 ;;;; A test name is a list of printable objects. For example:
113 ;;;; ("ports.scm" "file" "read and write back list of strings")
114 ;;;; ("ports.scm" "pipe" "read")
116 ;;;; Test names may contain arbitrary objects, but they always have
117 ;;;; the following properties:
118 ;;;; - Test names can be compared with EQUAL?.
119 ;;;; - Test names can be reliably stored and retrieved with the standard WRITE
120 ;;;; and READ procedures; doing so preserves their identity.
124 ;;;; (pass-if "simple addition" (= 4 (+ 2 2)))
126 ;;;; In that case, the test name is the list ("simple addition").
128 ;;;; The WITH-TEST-PREFIX syntax and WITH-TEST-PREFIX* procedure establish
129 ;;;; a prefix for the names of all tests whose results are reported
130 ;;;; within their dynamic scope. For example:
133 ;;;; (with-test-prefix "basic arithmetic"
134 ;;;; (pass-if "addition" (= (+ 2 2) 4))
135 ;;;; (pass-if "subtraction" (= (- 4 2) 2)))
136 ;;;; (pass-if "multiplication" (= (* 2 2) 4)))
138 ;;;; In that example, the three test names are:
139 ;;;; ("basic arithmetic" "addition"),
140 ;;;; ("basic arithmetic" "subtraction"), and
141 ;;;; ("multiplication").
143 ;;;; WITH-TEST-PREFIX can be nested. Each WITH-TEST-PREFIX postpends
144 ;;;; a new element to the current prefix:
146 ;;;; (with-test-prefix "arithmetic"
147 ;;;; (with-test-prefix "addition"
148 ;;;; (pass-if "integer" (= (+ 2 2) 4))
149 ;;;; (pass-if "complex" (= (+ 2+3i 4+5i) 6+8i)))
150 ;;;; (with-test-prefix "subtraction"
151 ;;;; (pass-if "integer" (= (- 2 2) 0))
152 ;;;; (pass-if "complex" (= (- 2+3i 1+2i) 1+1i))))
154 ;;;; The four test names here are:
155 ;;;; ("arithmetic" "addition" "integer")
156 ;;;; ("arithmetic" "addition" "complex")
157 ;;;; ("arithmetic" "subtraction" "integer")
158 ;;;; ("arithmetic" "subtraction" "complex")
160 ;;;; To print a name for a human reader, we DISPLAY its elements,
161 ;;;; separated by ": ". So, the last set of test names would be
164 ;;;; arithmetic: addition: integer
165 ;;;; arithmetic: addition: complex
166 ;;;; arithmetic: subtraction: integer
167 ;;;; arithmetic: subtraction: complex
169 ;;;; The Guile benchmarks use with-test-prefix to include the name of
170 ;;;; the source file containing the test in the test name, to help
171 ;;;; developers to find failing tests, and to provide each file with its
177 ;;;; A reporter is a function which we apply to each test outcome.
178 ;;;; Reporters can log results, print interesting results to the
179 ;;;; standard output, collect statistics, etc.
181 ;;;; A reporter function takes two mandatory arguments, RESULT and TEST, and
182 ;;;; possibly additional arguments depending on RESULT; its return value
183 ;;;; is ignored. RESULT has one of the following forms:
185 ;;;; pass - The test named TEST passed.
186 ;;;; Additional arguments are ignored.
187 ;;;; upass - The test named TEST passed unexpectedly.
188 ;;;; Additional arguments are ignored.
189 ;;;; fail - The test named TEST failed.
190 ;;;; Additional arguments are ignored.
191 ;;;; xfail - The test named TEST failed, as expected.
192 ;;;; Additional arguments are ignored.
193 ;;;; unresolved - The test named TEST did not perform as expected, for
194 ;;;; example the property that was to be tested could not be
195 ;;;; tested because something else went wrong.
196 ;;;; Additional arguments are ignored.
197 ;;;; untested - The test named TEST was not actually performed, for
198 ;;;; example because the test case is not complete yet.
199 ;;;; Additional arguments are ignored.
200 ;;;; unsupported - The test named TEST requires some feature that is not
201 ;;;; available in the configured testing environment.
202 ;;;; Additional arguments are ignored.
203 ;;;; error - An error occurred while the test named TEST was
204 ;;;; performed. Since this result means that the system caught
205 ;;;; an exception it could not handle, the exception arguments
206 ;;;; are passed as additional arguments.
208 ;;;; This library provides some standard reporters for logging results
209 ;;;; to a file, reporting interesting results to the user, and
210 ;;;; collecting totals.
212 ;;;; You can use the REGISTER-REPORTER function and friends to add
213 ;;;; whatever reporting functions you like. If you don't register any
214 ;;;; reporters, the library uses FULL-REPORTER, which simply writes
215 ;;;; all results to the standard output.
221 ;;; Define some exceptions which are commonly being tested for.
222 (define exception:out-of-range
223 (cons 'out-of-range "^Argument .*out of range"))
224 (define exception:unbound-var
225 (cons 'unbound-variable "^Unbound variable"))
226 (define exception:wrong-num-args
227 (cons 'wrong-number-of-args "^Wrong number of arguments"))
228 (define exception:wrong-type-arg
229 (cons 'wrong-type-arg "^Wrong type argument"))
231 ;;; Display all parameters to the default output port, followed by a newline.
232 (define (display-line . objs)
233 (for-each display objs)
236 ;;; Display all parameters to the given output port, followed by a newline.
237 (define (display-line-port port . objs)
238 (for-each (lambda (obj) (display obj port)) objs)
245 ;;; The central testing routine.
246 ;;; The idea is taken from Greg, the GNUstep regression test environment.
248 (let ((test-running #f))
249 (define (local-run-test name expect-pass thunk)
251 (error "Nested calls to run-test are not permitted.")
252 (let ((test-name (full-name name)))
253 (set! test-running #t)
256 (let ((result (thunk)))
257 (if (eq? result #t) (throw 'pass))
258 (if (eq? result #f) (throw 'fail))
259 (throw 'unresolved)))
263 (report (if expect-pass 'pass 'upass) test-name))
265 (report (if expect-pass 'fail 'xfail) test-name))
266 ((unresolved untested unsupported)
267 (report key test-name))
269 (report 'unresolved test-name)
272 (report 'error test-name (cons key args))))))
273 (set! test-running #f))))
274 (set! run-test local-run-test))
276 ;;; A short form for tests that are expected to pass, taken from Greg.
277 (defmacro pass-if (name body . rest)
278 `(run-test ,name #t (lambda () ,body ,@rest)))
280 ;;; A short form for tests that are expected to fail, taken from Greg.
281 (defmacro expect-fail (name body . rest)
282 `(run-test ,name #f (lambda () ,body ,@rest)))
284 ;;; A helper function to implement the macros that test for exceptions.
285 (define (run-test-exception name exception expect-pass thunk)
286 (run-test name expect-pass
288 (stack-catch (car exception)
289 (lambda () (thunk) #f)
290 (lambda (key proc message . rest)
292 ;; handle explicit key
293 ((string-match (cdr exception) message)
295 ;; handle `(error ...)' which uses `misc-error' for key and doesn't
296 ;; yet format the message and args (we have to do it here).
297 ((and (eq? 'misc-error (car exception))
299 (string-match (cdr exception)
300 (apply simple-format #f message (car rest))))
302 ;; unhandled; throw again
304 (apply throw key proc message rest))))))))
306 ;;; A short form for tests that expect a certain exception to be thrown.
307 (defmacro pass-if-exception (name exception body . rest)
308 `(,run-test-exception ,name ,exception #t (lambda () ,body ,@rest)))
310 ;;; A short form for tests expected to fail to throw a certain exception.
311 (defmacro expect-fail-exception (name exception body . rest)
312 `(,run-test-exception ,name ,exception #f (lambda () ,body ,@rest)))
318 ;;;; Turn a test name into a nice human-readable string.
319 (define (format-test-name name)
320 (call-with-output-string
322 (let loop ((name name)
326 (display separator port)
327 (display (car name) port)
328 (loop (cdr name) ": ")))))))
330 ;;;; For a given test-name, deliver the full name including all prefixes.
331 (define (full-name name)
332 (append (current-test-prefix) (list name)))
334 ;;; A fluid containing the current test prefix, as a list.
335 (define prefix-fluid (make-fluid))
336 (fluid-set! prefix-fluid '())
337 (define (current-test-prefix)
338 (fluid-ref prefix-fluid))
340 ;;; Postpend PREFIX to the current name prefix while evaluting THUNK.
341 ;;; The name prefix is only changed within the dynamic scope of the
342 ;;; call to with-test-prefix*. Return the value returned by THUNK.
343 (define (with-test-prefix* prefix thunk)
344 (with-fluids ((prefix-fluid
345 (append (fluid-ref prefix-fluid) (list prefix))))
348 ;;; (with-test-prefix PREFIX BODY ...)
349 ;;; Postpend PREFIX to the current name prefix while evaluating BODY ...
350 ;;; The name prefix is only changed within the dynamic scope of the
351 ;;; with-test-prefix expression. Return the value returned by the last
353 (defmacro with-test-prefix (prefix . body)
354 `(with-test-prefix* ,prefix (lambda () ,@body)))
360 ;;; The global list of reporters.
361 (define reporters '())
363 ;;; The default reporter, to be used only if no others exist.
364 (define default-reporter #f)
366 ;;; Add the procedure REPORTER to the current set of reporter functions.
367 ;;; Signal an error if that reporter procedure object is already registered.
368 (define (register-reporter reporter)
369 (if (memq reporter reporters)
370 (error "register-reporter: reporter already registered: " reporter))
371 (set! reporters (cons reporter reporters)))
373 ;;; Remove the procedure REPORTER from the current set of reporter
374 ;;; functions. Signal an error if REPORTER is not currently registered.
375 (define (unregister-reporter reporter)
376 (if (memq reporter reporters)
377 (set! reporters (delq! reporter reporters))
378 (error "unregister-reporter: reporter not registered: " reporter)))
380 ;;; Return true iff REPORTER is in the current set of reporter functions.
381 (define (reporter-registered? reporter)
382 (if (memq reporter reporters) #t #f))
384 ;;; Send RESULT to all currently registered reporter functions.
385 (define (report . args)
386 (if (pair? reporters)
387 (for-each (lambda (reporter) (apply reporter args))
389 (apply default-reporter args)))
392 ;;;; Some useful standard reporters:
393 ;;;; Count reporters count the occurrence of each test result type.
394 ;;;; Log reporters write all test results to a given log file.
395 ;;;; Full reporters write all test results to the standard output.
396 ;;;; User reporters write interesting test results to the standard output.
398 ;;; The complete list of possible test results.
400 '((pass "PASS" "passes: ")
401 (fail "FAIL" "failures: ")
402 (upass "UPASS" "unexpected passes: ")
403 (xfail "XFAIL" "expected failures: ")
404 (unresolved "UNRESOLVED" "unresolved test cases: ")
405 (untested "UNTESTED" "untested test cases: ")
406 (unsupported "UNSUPPORTED" "unsupported test cases: ")
407 (error "ERROR" "errors: ")))
409 ;;; The list of important test results.
410 (define important-result-tags
411 '(fail upass unresolved error))
413 ;;; Display a single test result in formatted form to the given port
414 (define (print-result port result name . args)
415 (let* ((tag (assq result result-tags))
416 (label (if tag (cadr tag) #f)))
421 (display (format-test-name name) port)
424 (display " - arguments: " port)
427 (error "(test-suite lib) FULL-REPORTER: unrecognized result: "
430 ;;; Return a list of the form (COUNTER RESULTS), where:
431 ;;; - COUNTER is a reporter procedure, and
432 ;;; - RESULTS is a procedure taking no arguments which returns the
433 ;;; results seen so far by COUNTER. The return value is an alist
434 ;;; mapping outcome symbols (`pass', `fail', etc.) onto counts.
435 (define (make-count-reporter)
436 (let ((counts (map (lambda (tag) (cons (car tag) 0)) result-tags)))
438 (lambda (result name . args)
439 (let ((pair (assq result counts)))
441 (set-cdr! pair (+ 1 (cdr pair)))
442 (error "count-reporter: unexpected test result: "
443 (cons result (cons name args))))))
445 (append counts '())))))
447 ;;; Print a count reporter's results nicely. Pass this function the value
448 ;;; returned by a count reporter's RESULTS procedure.
449 (define (print-counts results . port?)
450 (let ((port (if (pair? port?)
452 (current-output-port))))
454 (display-line-port port "Totals for this test run:")
457 (let ((result (assq (car tag) results)))
459 (display-line-port port (caddr tag) (cdr result))
460 (display-line-port port
462 "no total available for `" (car tag) "'"))))
466 ;;; Return a reporter procedure which prints all results to the file
467 ;;; FILE, in human-readable form. FILE may be a filename, or a port.
468 (define (make-log-reporter file)
469 (let ((port (if (output-port? file) file
470 (open-output-file file))))
472 (apply print-result port args)
473 (force-output port))))
475 ;;; A reporter that reports all results to the user.
476 (define (full-reporter . args)
477 (apply print-result (current-output-port) args))
479 ;;; A reporter procedure which shows interesting results (failures,
480 ;;; unexpected passes etc.) to the user.
481 (define (user-reporter result name . args)
482 (if (memq result important-result-tags)
483 (apply full-reporter result name args)))
485 (set! default-reporter full-reporter)