diff --git a/src/tests/1am.lisp b/src/tests/1am.lisp
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+;;; Copyright (c) 2014 James M. Lawrence
+;;;
+;;; Permission is hereby granted, free of charge, to any person
+;;; obtaining a copy of this software and associated documentation
+;;; files (the "Software"), to deal in the Software without
+;;; restriction, including without limitation the rights to use, copy,
+;;; modify, merge, publish, distribute, sublicense, and/or sell copies
+;;; of the Software, and to permit persons to whom the Software is
+;;; furnished to do so, subject to the following conditions:
+;;;
+;;; The above copyright notice and this permission notice shall be
+;;; included in all copies or substantial portions of the Software.
+;;;
+;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+;;; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+;;; DEALINGS IN THE SOFTWARE.
+
+(defpackage #:1am-ecl
+  (:use #:cl)
+  (:export #:test #:is #:signals #:run #:*tests*))
+
+(in-package #:1am-ecl)
+
+(defvar *tests* nil "A list of tests; the default argument to `run'.")
+(defvar *pass-count* nil)
+(defvar *running* nil)
+(defvar *failed-random-state* nil)
+
+(defun %shuffle (vector)
+  (loop for i downfrom (- (length vector) 1) to 1
+        do (rotatef (aref vector i) (aref vector (random (1+ i)))))
+  vector)
+
+(defun shuffle (sequence)
+  (%shuffle (map 'vector #'identity sequence)))
+
+(defun call-with-random-state (fn)
+  (let ((*random-state* (or *failed-random-state*
+                            (load-time-value (make-random-state t)))))
+    (setf *failed-random-state* (make-random-state nil))
+    (multiple-value-prog1 (funcall fn)
+      (setf *failed-random-state* nil))))
+
+(defun report (test-count pass-count)
+  (format t "~&Success: ~s test~:p, ~s check~:p.~%" test-count pass-count))
+
+(defun %run (fn test-count)
+  (let ((*pass-count* 0))
+    (multiple-value-prog1 (call-with-random-state fn)
+      (report test-count *pass-count*))))
+
+(defun run (&optional (tests *tests*))
+  "Run each test in the sequence `tests'. Default is `*tests*'."
+  (let ((*running* t))
+    (%run (lambda () (map nil #'funcall (shuffle tests)))
+          (length tests)))
+  (values))
+
+(defun call-test (name fn)
+  (format t "~&~s" name)
+  (finish-output)
+  (if *running*
+      (funcall fn)
+      (%run fn 1)))
+
+(defmacro test (name &body body)
+  "Define a test function and add it to `*tests*'."
+  `(progn
+     (defun ,name ()
+       (call-test ',name (lambda () ,@body)))
+     (pushnew ',name *tests*)
+     ',name))
+
+(defun passed ()
+  (write-char #\.)
+  ;; Checks done outside a test run are not tallied.
+  (when *pass-count*
+    (incf *pass-count*))
+  (values))
+
+(defmacro is (form)
+  "Assert that `form' evaluates to non-nil."
+  `(progn
+     (assert ,form)
+     (passed)))
+
+(defun %signals (expected fn)
+  (flet ((handler (condition)
+           (cond ((typep condition expected)
+                  (passed)
+                  (return-from %signals (values)))
+                 (t (error "Expected to signal ~s, but got ~s:~%~a"
+                           expected (type-of condition) condition)))))
+    (handler-bind ((condition #'handler))
+      (funcall fn)))
+  (error "Expected to signal ~s, but got nothing." expected))
+
+(defmacro signals (condition &body body)
+  "Assert that `body' signals a condition of type `condition'."
+  `(%signals ',condition (lambda () ,@body)))