2013-04-12: added a factorial test.

added a factorial test.

diff --git a/tests/factorial.w b/tests/factorial.w
new file mode 100644
--- /dev/null
+++ b/tests/factorial.w
@@ -0,0 +1,22 @@
+;; short version
+; note: once you use one inline colon, all the following forms on that
+; line will get closed at the end of the line
+
+define : factorial n
+  if : zero? n
+    . 1
+    * n : factorial : - n 1
+
+display : factorial 5 
+
+
+;; more vertical space, less colons
+define : factorial n
+  if : zero? n
+    . 1
+    * n 
+      factorial 
+        - n 1
+
+display : factorial 5 
+