diff --git a/testing/lisp/test-ob-comint.el b/testing/lisp/test-ob-comint.el
new file mode 100644
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+++ b/testing/lisp/test-ob-comint.el
@@ -0,0 +1,55 @@
+;;; test-ob-comint.el  -*- lexical-binding: t; -*-
+
+;; Copyright (c) 2024 Matthew Trzcinski
+;; Authors: Matthew Trzcinski
+
+;; This file is not part of GNU Emacs.
+
+;; 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 <https://www.gnu.org/licenses/>.
+
+
+;;; Comment:
+
+;; See testing/README for how to run tests.
+
+
+;;; Requirements:
+
+
+;;; Code:
+(ert-deftest test-org-babel-comint/prompt-filter-removes-prompt ()
+  "Test that prompt is actually removed."
+  (let* ((prompt "org_babel_sh_prompt> ")
+         (results "org_babel_sh_prompt> echo 'ob_comint_async_shell_start_d78ac49f-dc8a-4c39-827c-c93225484d59'
+# print message
+echo \"hello world\"
+echo 'ob_comint_async_shell_end_d78ac49f-dc8a-4c39-827c-c93225484d59'
+ob_comint_async_shell_start_d78ac49f-dc8a-4c39-827c-c93225484d59
+org_babel_sh_prompt> org_babel_sh_prompt> \"hello world\"
+org_babel_sh_prompt> ob_comint_async_shell_end_d78ac49f-dc8a-4c39-827c-c93225484d59
+org_babel_sh_prompt> "))
+    (should (string=
+             (org-trim (string-join (mapcar #'org-trim (org-babel-comint--prompt-filter results prompt)) "\n") "\n")
+             "echo 'ob_comint_async_shell_start_d78ac49f-dc8a-4c39-827c-c93225484d59'
+# print message
+echo \"hello world\"
+echo 'ob_comint_async_shell_end_d78ac49f-dc8a-4c39-827c-c93225484d59'
+ob_comint_async_shell_start_d78ac49f-dc8a-4c39-827c-c93225484d59
+\"hello world\"
+ob_comint_async_shell_end_d78ac49f-dc8a-4c39-827c-c93225484d59"))))
+
+
+(provide 'test-ob-comint)
+
+;;; test-ob-comint.el ends here