ob-ruby.el: fix result of :results output :session combination.

* lisp/ob-ruby.el (org-babel-ruby-evaluate):
  set conf.echo=false for the duration of evaluation.

* testing/lisp/test-ob-ruby.el (test-ob-ruby/session-output): new test.

lisp/ob-ruby.el

@@ -225,7 +225,7 @@ return the value of the last statement in BODY, as elisp."
 	      (mapc
 	       (lambda (line)
 		 (insert (org-babel-chomp line)) (comint-send-input nil t))
-	       (list body org-babel-ruby-eoe-indicator))
+	       (list "conf.echo=false" body "conf.echo=true" org-babel-ruby-eoe-indicator))
 	      (comint-send-input nil t)) 2)
 	   "\n") "[\r\n]")) "\n"))
       (value

testing/lisp/test-ob-ruby.el

@@ -0,0 +1,49 @@
+;;; test-ob-ruby.el --- tests for ob-ruby.el
+
+;; Copyright (c) 2013 Oleh Krehel
+;; Authors: Oleh Krehel
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+(org-test-for-executable "ruby")
+(unless (featurep 'ob-ruby)
+  (signal 'missing-test-dependency "Support for Ruby code blocks"))
+
+(ert-deftest test-ob-ruby/session-output ()
+    (should (equal (org-test-with-temp-text "#+begin_src ruby :session :results output
+s = \"1\"
+s = \"2\"
+s = \"3\"
+puts s
+#+end_src"
+  (org-ctrl-c-ctrl-c)
+  (substring-no-properties
+   (buffer-string)))
+		   "#+begin_src ruby :session :results output
+s = \"1\"
+s = \"2\"
+s = \"3\"
+puts s
+#+end_src
+
+#+RESULTS:
+: 
+: 3
+
+")))
+
+(provide 'test-ob-ruby)
+
+;;; test-ob-ruby.el ends here