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+;;;; -*- Mode: Lisp; indent-tabs-mode: nil -*-
+
+(in-package :it.bese.fiveam)
+
+;;;; * Analyzing the results
+
+(defparameter *verbose-failures* nil
+  "T if we should print the expression failing, NIL otherwise.")
+
+;;;; Just as important as defining and runnig the tests is
+;;;; understanding the results. FiveAM provides the function EXPLAIN
+;;;; which prints a human readable summary (number passed, number
+;;;; failed, what failed and why, etc.) of a list of test results.
+
+(defgeneric explain (explainer results &optional stream recursive-depth)
+  (:documentation "Given a list of test results report write to stream detailed
+ human readable statistics regarding the results."))
+
+(defmethod explain ((exp detailed-text-explainer) results
+                    &optional (stream *test-dribble*) (recursive-depth 0))
+  (multiple-value-bind (num-checks passed num-passed passed%
+                                   skipped num-skipped skipped%
+                                   failed num-failed failed%
+                                   unknown num-unknown unknown%)
+      (partition-results results)
+    (declare (ignore passed))
+    (flet ((output (&rest format-args)
+             (format stream "~&~vT" recursive-depth)
+             (apply #'format stream format-args)))
+
+      (when (zerop num-checks)
+        (output "Didn't run anything...huh?")
+        (return-from explain nil))
+      (output "Did ~D check~P.~%" num-checks num-checks)
+      (output "   Pass: ~D (~2D%)~%" num-passed passed%)
+      (output "   Skip: ~D (~2D%)~%" num-skipped skipped%)
+      (output "   Fail: ~D (~2D%)~%" num-failed failed%)
+      (when unknown
+        (output "   UNKNOWN RESULTS: ~D (~2D)~%" num-unknown unknown%))
+      (terpri stream)
+      (when failed
+        (output "Failure Details:~%")
+        (dolist (f (reverse failed))
+          (output "--------------------------------~%")
+          (output "~A ~@{[~A]~}: ~%"
+                  (name (test-case f))
+                  (description (test-case f)))
+          (output "     ~A.~%" (reason f))
+          (when (for-all-test-failed-p f)
+            (output "Results collected with failure data:~%")
+            (explain exp (slot-value f 'result-list)
+                     stream (+ 4 recursive-depth)))
+          (when (and *verbose-failures* (test-expr f))
+            (output "    ~S~%" (test-expr f)))
+          (output "--------------------------------~%"))
+        (terpri stream))
+      (when skipped
+        (output "Skip Details:~%")
+        (dolist (f skipped)
+          (output "~A ~@{[~A]~}: ~%"
+                  (name (test-case f))
+                  (description (test-case f)))
+          (output "    ~A.~%" (reason f)))
+        (terpri stream)))))
+
+(defmethod explain ((exp simple-text-explainer) results
+                    &optional (stream *test-dribble*) (recursive-depth 0))
+  (multiple-value-bind (num-checks passed num-passed passed%
+                                   skipped num-skipped skipped%
+                                   failed num-failed failed%
+                                   unknown num-unknown unknown%)
+      (partition-results results)
+    (declare (ignore passed passed% skipped skipped% failed failed% unknown unknown%))
+    (format stream "~&~vTRan ~D checks, ~D passed" recursive-depth num-checks num-passed)
+    (when (plusp num-skipped)
+      (format stream ", ~D skipped " num-skipped))
+    (format stream " and ~D failed.~%" num-failed)
+    (when (plusp num-unknown)
+      (format stream "~vT~D UNKNOWN RESULTS.~%" recursive-depth num-unknown))))
+
+(defun partition-results (results-list)
+  (let ((num-checks (length results-list)))
+    (destructuring-bind (passed skipped failed unknown)
+        (partitionx results-list
+                    (lambda (res)
+                      (typep res 'test-passed))
+                    (lambda (res)
+                      (typep res 'test-skipped))
+                    (lambda (res)
+                      (typep res 'test-failure))
+                    t)
+      (if (zerop num-checks)
+          (values 0
+                  nil 0 0
+                  nil 0 0
+                  nil 0 0
+                  nil 0 0)
+          (values
+           num-checks
+           passed (length passed) (floor (* 100 (/ (length passed) num-checks)))
+           skipped (length skipped) (floor (* 100 (/ (length skipped) num-checks)))
+           failed (length failed) (floor (* 100 (/ (length failed) num-checks)))
+           unknown (length unknown) (floor (* 100 (/ (length failed) num-checks))))))))
+
+;; 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