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;;;; -*- Mode: Lisp; indent-tabs-mode: nil -*-

;;;; * Running Tests

;;;; Once the programmer has defined what the tests are these need to
;;;; be run and the expected effects should be compared with the
;;;; actual effects. FiveAM provides the function RUN for this
;;;; purpose, RUN executes a number of tests and collects the results
;;;; of each individual check into a list which is then
;;;; returned. There are three types of test results: passed, failed
;;;; and skipped, these are represented by TEST-RESULT objects.

;;;; Generally running a test will return normally, but there are two
;;;; exceptional situations which can occur:

;;;; - An exception is signaled while running the test. If the
;;;;   variable *debug-on-error* is T than FiveAM will enter the
;;;;   debugger, otherwise a test failure (of type
;;;;   unexpected-test-failure) is returned. When entering the
;;;;   debugger two restarts are made available, one simply reruns the
;;;;   current test and another signals a test-failure and continues
;;;;   with the remaining tests.

;;;; - A circular dependency is detected. An error is signaled and a
;;;;   restart is made available which signals a test-skipped and
;;;;   continues with the remaining tests. This restart also sets the
;;;;   dependency status of the test to nil, so any tests which depend
;;;;   on this one (even if the dependency is not circular) will be
;;;;   skipped.

;;;; The functions RUN!, !, !! and !!! are convenient wrappers around
;;;; RUN and EXPLAIN.

(defparameter *debug-on-error* nil
  "T if we should drop into a debugger on error, NIL otherwise.")

(defparameter *debug-on-failure* nil
  "T if we should drop into a debugger on a failing check, NIL otherwise.")

(defparameter *print-names* t
  "T if we should print test running progress, NIL otherwise.")

(defun import-testing-symbols (package-designator)
  (import '(5am::is 5am::is-true 5am::is-false 5am::signals 5am::finishes)
          package-designator))

(defparameter *run-queue* '()
  "List of test waiting to be run.")

(define-condition circular-dependency (error)
  ((test-case :initarg :test-case))
  (:report (lambda (cd stream)
             (format stream "A circular dependency wes detected in ~S." (slot-value cd 'test-case))))
  (:documentation "Condition signaled when a circular dependency
between test-cases has been detected."))

(defgeneric run-resolving-dependencies (test)
  (:documentation "Given a dependency spec determine if the spec
is satisfied or not, this will generally involve running other
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tests. If the dependency spec can be satisfied the test is also
run."))

(defmethod run-resolving-dependencies ((test test-case))
  "Return true if this test, and its dependencies, are satisfied,
  NIL otherwise."
  (case (status test)
    (:unknown
     (setf (status test) :resolving)
     (if (or (not (depends-on test))
             (eql t (resolve-dependencies (depends-on test))))
         (progn
           (run-test-lambda test)
           (status test))
         (with-run-state (result-list)
           (unless (eql :circular (status test))
             (push (make-instance 'test-skipped
                                  :test-case test
                                  :reason "Dependencies not satisfied")
                   result-list)
             (setf (status test) :depends-not-satisfied)))))
    (:resolving
     (restart-case
         (error 'circular-dependency :test-case test)
       (skip ()
         :report (lambda (s)
                   (format s "Skip the test ~S and all its dependencies." (name test)))
         (with-run-state (result-list)
           (push (make-instance 'test-skipped :reason "Circular dependencies" :test-case test)
                 result-list))
         (setf (status test) :circular))))
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(defgeneric resolve-dependencies (depends-on))

(defmethod resolve-dependencies ((depends-on symbol))
  "A test which depends on a symbol is interpreted as `(AND
  ,DEPENDS-ON)."
  (run-resolving-dependencies (get-test depends-on)))

(defmethod resolve-dependencies ((depends-on list))
  "Return true if the dependency spec DEPENDS-ON is satisfied,
  nil otherwise."
  (if (null depends-on)
      t
      (flet ((satisfies-depends-p (test)
               (funcall test (lambda (dep)
                               (eql t (resolve-dependencies dep)))
                        (cdr depends-on))))
        (ecase (car depends-on)
          (and (satisfies-depends-p #'every))
          (or  (satisfies-depends-p #'some))
          (not (satisfies-depends-p #'notany))
          (:before (every #'(lambda (dep)
                              (let ((status (status (get-test dep))))
                                (eql :unknown status)))
                          (cdr depends-on)))))))

(defun results-status (result-list)
  "Given a list of test results (generated while running a test)
  return true if all of the results are of type TEST-PASSED,
  fail otherwise.
  Returns a second value, which is the set of failed tests."
  (let ((failed-tests
          (remove-if #'test-passed-p result-list)))
    (values (null failed-tests)
            failed-tests)))

(defun return-result-list (test-lambda)
  "Run the test function TEST-LAMBDA and return a list of all
  test results generated, does not modify the special environment
  variable RESULT-LIST."
  (bind-run-state ((result-list '()))
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(defgeneric run-test-lambda (test))

(defmethod run-test-lambda ((test test-case))
  (with-run-state (result-list)
    (bind-run-state ((current-test test))
      (labels ((abort-test (e)
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                 (add-result 'unexpected-test-failure
                             :test-expr nil
                             :test-case test
                             :reason (format nil "Unexpected Error: ~S~%~A." e e)
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                             :condition e))
               (run-it ()
                 (let ((result-list '()))
                   (declare (special result-list))
                   (handler-bind ((check-failure (lambda (e)
                                                   (declare (ignore e))
                                                   (unless *debug-on-failure*
                                                     (invoke-restart
                                                      (find-restart 'ignore-failure)))))
                                  (error (lambda (e)
                                           (unless (or *debug-on-error*
                                                       (typep e 'check-failure))
                                             (abort-test e)
                                             (return-from run-it result-list)))))
                     (restart-case
                         (let ((*readtable* (copy-readtable))
                               (*package* (runtime-package test)))
                           (if (collect-profiling-info test)
                               ;; Timing info doesn't get collected ATM, we need a portable library
                               ;; (setf (profiling-info test) (collect-timing (test-lambda test)))
                               (funcall (test-lambda test))
                       (retest ()
                         :report (lambda (stream)
                                   (format stream "~@<Rerun the test ~S~@:>" test))
                         (return-from run-it (run-it)))
                       (ignore ()
                         :report (lambda (stream)
                                   (format stream "~@<Signal an exceptional test failure and abort the test ~S.~@:>" test))
                         (abort-test (make-instance 'test-failure :test-case test
                                                    :reason "Failure restart."))))
                     result-list))))
        (let ((results (run-it)))
          (setf (status test) (results-status results)
                result-list (nconc result-list results)))))))

(defgeneric %run (test-spec)
  (:documentation "Internal method for running a test. Does not
  update the status of the tests nor the special variables !,
  !!, !!!"))

(defmethod %run ((test test-case))
  (when *print-names*
    (format *debug-io* "~% Running test ~A " (name test)))
  (run-resolving-dependencies test))

(defmethod %run ((tests list))
  (mapc #'%run tests))

(defmethod %run ((suite test-suite))
  (when *print-names*
    (format *debug-io* "~%Running test suite ~A~%" (name suite)))
    (flet ((run-tests ()
             (loop
                for test being the hash-values of (tests suite)
                do (%run test))))
      (unwind-protect
           (bind-run-state ((result-list '()))
             (unwind-protect
                  (if (collect-profiling-info suite)
                      ;; Timing info doesn't get collected ATM, we need a portable library
                      ;; (setf (profiling-info suite) (collect-timing #'run-tests))
                      (run-tests)
                      (run-tests)))
             (setf suite-results result-list
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                   (status suite) (every #'test-passed-p suite-results)))
        (with-run-state (result-list)
          (setf result-list (nconc result-list suite-results)))))))

(defmethod %run ((test-name symbol))
  (when-let (test (get-test test-name))
    (%run test)))

(defvar *initial-!* (lambda () (format t "Haven't run that many tests yet.~%")))

(defvar *!* *initial-!*)
(defvar *!!* *initial-!*)
(defvar *!!!* *initial-!*)

;;;; ** Public entry points

(defun run! (&optional (test-spec *suite*)
             &key ((:print-names *print-names*) *print-names*))
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  "Equivalent to (explain! (run TEST-SPEC))."
  (explain! (run test-spec)))

(defun explain! (result-list)
  "Explain the results of RESULT-LIST using a
detailed-text-explainer with output going to *test-dribble*"
  (explain (make-instance 'detailed-text-explainer) result-list *test-dribble*))

(defun debug! (&optional (test-spec *suite*))
  "Calls (run! test-spec) but enters the debugger if any kind of error happens."
  (let ((*debug-on-error* t)
        (*debug-on-failure* t))
    (run! test-spec)))

(defun run (test-spec &key ((:print-names *print-names*) *print-names*))

TEST-SPEC can be either a symbol naming a test or test suite, or
a testable-object object. This function changes the operations
performed by the !, !! and !!! functions."
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               (loop :for test :being :the :hash-keys :of *test*
                     :do (setf (status (get-test test)) :unknown))
               (bind-run-state ((result-list '()))
                 (with-simple-restart (explain "Ignore the rest of the tests and explain current results")
                   (%run test-spec))
                 result-list))
         *!!* *!*
         *!!!* *!!*)
  (funcall *!*))
(defun ! ()
  "Rerun the most recently run test and explain the results."
  (explain! (funcall *!*)))

(defun !! ()
  "Rerun the second most recently run test and explain the results."
  (explain! (funcall *!!*)))
(defun !!! ()
  "Rerun the third most recently run test and explain the results."
  (explain! (funcall *!!!*)))

;; Copyright (c) 2002-2003, Edward Marco Baringer
;; All rights reserved.
;;
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions are
;; met:
;;  - Redistributions of source code must retain the above copyright
;;    notice, this list of conditions and the following disclaimer.
;;  - Redistributions in binary form must reproduce the above copyright
;;    notice, this list of conditions and the following disclaimer in the
;;    documentation and/or other materials provided with the distribution.
;;
;;  - Neither the name of Edward Marco Baringer, nor BESE, nor the names
;;    of its contributors may be used to endorse or promote products
;;    derived from this software without specific prior written permission.
;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;; A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
;; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.