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+;; Fibers: cooperative, event-driven user-space threads.
+
+;;;; Copyright (C) 2016 Free Software Foundation, Inc.
+;;;;
+;;;; This library is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU Lesser General Public
+;;;; License as published by the Free Software Foundation; either
+;;;; version 3 of the License, or (at your option) any later version.
+;;;;
+;;;; This library is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;;; Lesser General Public License for more details.
+;;;;
+;;;; You should have received a copy of the GNU Lesser General Public
+;;;; License along with this library; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+;;;;
+
+(define-module (tests conditions)
+  #:use-module (fibers)
+  #:use-module (fibers conditions)
+  #:use-module (fibers operations)
+  #:use-module (fibers timers))
+
+(define failed? #f)
+
+(define-syntax-rule (assert-equal expected actual)
+  (let ((x expected))
+    (format #t "assert ~s equal to ~s: " 'actual x)
+    (force-output)
+    (let ((y actual))
+      (cond
+       ((equal? x y) (format #t "ok\n"))
+       (else
+        (format #t "no (got ~s)\n" y)
+        (set! failed? #t))))))
+
+(define-syntax-rule (assert-run-fibers-terminates exp)
+  (begin
+    (format #t "assert run-fibers on ~s terminates: " 'exp)
+    (force-output)
+    (let ((start (get-internal-real-time)))
+      (call-with-values (lambda () (run-fibers (lambda () exp)))
+        (lambda vals
+          (format #t "ok (~a s)\n" (/ (- (get-internal-real-time) start)
+                                      1.0 internal-time-units-per-second))
+          (apply values vals))))))
+
+(define-syntax-rule (assert-run-fibers-returns (expected ...) exp)
+  (begin
+    (call-with-values (lambda () (assert-run-fibers-terminates exp))
+      (lambda run-fiber-return-vals
+        (assert-equal '(expected ...) run-fiber-return-vals)))))
+
+(define* (with-timeout op #:key (seconds 0.05) (wrap values))
+  (choice-operation op
+                    (wrap-operation (sleep-operation seconds) wrap)))
+
+(define (wait/timeout cv)
+  (perform-operation
+   (with-timeout
+    (wrap-operation (wait-operation cv)
+                    (lambda () #t))
+    #:wrap (lambda () #f))))
+
+(define cv (make-condition))
+(assert-equal #t (condition? cv))
+(assert-run-fibers-returns (#f) (wait/timeout cv))
+(assert-run-fibers-returns (#f) (wait/timeout cv))
+(assert-equal #t (signal-condition! cv))
+(assert-equal #f (signal-condition! cv))
+(assert-run-fibers-returns (#t) (wait/timeout cv))
+(assert-run-fibers-returns (#t) (wait/timeout cv))
+(assert-run-fibers-returns (#t)
+                           (let ((cv (make-condition)))
+                             (spawn-fiber (lambda () (signal-condition! cv)))
+                             (wait cv)
+                             #t))
+
+(exit (if failed? 1 0))