Add tests as a PoC. Do not for merge.

tests/plugins/twitter-summary-card.lisp

@@ -0,0 +1,59 @@
+(stefil:define-test-package :twitter-summary-card-tests
+  (:use :cl :coleslaw
+             :cl-ppcre))
+
+(in-package :twitter-summary-card-tests)
+;;;; 
+;; To run tests first eval the plugin code inside this package and then execute
+;; (twitter-summary-card-test:run-package-tests)
+;;;
+
+
+(defvar *short-post*
+    (make-instance 'post :title "hai" :text "very greetings" :format "html"))
+
+(defvar *long-post* 
+    (make-instance 'post :title "What a Wonderful World"
+                   :text "I see trees of green, red roses too.  I see them
+bloom, for me and you.  And I think to myself, what a wonderful world.
+
+I see skies of blue, 
+And clouds of white. 
+The bright blessed day, 
+The dark sacred night. 
+And I think to myself, 
+What a wonderful world. 
+
+The colors of the rainbow, 
+So pretty in the sky. 
+Are also on the faces, 
+Of people going by, 
+I see friends shaking hands. 
+Saying, \"How do you do?\" 
+They're really saying, 
+\"I love you\". 
+
+I hear babies cry, 
+I watch them grow, 
+They'll learn much more, 
+Than I'll ever know. 
+And I think to myself, 
+What a wonderful world. 
+
+Yes, I think to myself, 
+What a wonderful world. " :format "html"))
+
+(deftest summary-card-sans-twitter-handle ()
+  (let ((summary-card (summary-card *short-post* nil)))
+    (is (null (scan "twitter:author" summary-card)))))
+
+(deftest summary-card-with-twitter-handle ()
+  (let ((summary-card (summary-card *short-post* "@PuercoPop")))
+    (is (scan "twitter:author" summary-card))))
+
+(deftest summary-card-trims-long-post ()
+  (let ((summary-card (summary-card *long-post* nil)))
+    ;; (scan "twitter:description\" content=\"(.*)\"" summary-card)
+    summary-card))
+
+