unit-test.lisp

(defvar *test-name* nil)


(defmacro with-gensyms ((&rest names) &body body)
  `(let ,(loop for n in names collect `(,n (gensym)))
     ,@body))

(defmacro deftest (name parameters &body body)
	  "Define a test function.  Within a test function we can call
	   other test functions or use 'check' to run individual test
           cases."
	  `(defun ,name ,parameters
	    (let ((*test-name* (append *test-name* (list ',name))))
	      ,@body)))

(defmacro check (&body forms)
  "Run each expression in 'forms' as a test case."
  `(combine-results
    ,@(loop for f in forms collect `(report-result ,f ',f))))

(defmacro combine-results (&body forms)
  "Combine the results (as booleans) of evaluating 'forms' in order."
  (with-gensyms (result)
    `(let ((,result t))
       ,@(loop for f in forms collect `(unless ,f (setf ,result nil)))
       ,result)))

(defun report-result (result form)
  "Report the results of a single test case.  Called by 'check'."
  (format t "~:[FAIL~;pass~] ... ~a: ~a~%" result *test-name* form)
  result)