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+;;; test-prog-shell--make-script-executable.el --- Tests for cj/make-script-executable -*- lexical-binding: t -*-
+
+;;; Commentary:
+;; Tests for the cj/make-script-executable function in prog-shell.el
+
+;;; Code:
+
+(require 'ert)
+(require 'prog-shell)
+
+;; Helper to create temp file with content
+(defun test--create-temp-script (content)
+  "Create a temp file with CONTENT and return its path."
+  (let ((temp-file (make-temp-file "test-script-")))
+    (with-temp-file temp-file
+      (insert content))
+    ;; Remove execute permission to start fresh
+    (set-file-modes temp-file #o644)
+    temp-file))
+
+;; Helper to check if file is executable
+(defun test--file-executable-p (file)
+  "Return t if FILE has any execute bit set."
+  (not (zerop (logand (file-modes file) #o111))))
+
+;;; Normal Cases
+
+(ert-deftest test-make-script-executable-normal-bash-shebang ()
+  "File with bash shebang becomes executable."
+  (let ((temp-file (test--create-temp-script "#!/bin/bash\necho hello")))
+    (unwind-protect
+        (with-current-buffer (find-file-noselect temp-file)
+          (should-not (test--file-executable-p temp-file))
+          (cj/make-script-executable)
+          (should (test--file-executable-p temp-file))
+          (kill-buffer))
+      (delete-file temp-file))))
+
+(ert-deftest test-make-script-executable-normal-python-shebang ()
+  "File with python shebang becomes executable."
+  (let ((temp-file (test--create-temp-script "#!/usr/bin/env python3\nprint('hi')")))
+    (unwind-protect
+        (with-current-buffer (find-file-noselect temp-file)
+          (should-not (test--file-executable-p temp-file))
+          (cj/make-script-executable)
+          (should (test--file-executable-p temp-file))
+          (kill-buffer))
+      (delete-file temp-file))))
+
+(ert-deftest test-make-script-executable-normal-already-executable ()
+  "Already executable file stays executable without error."
+  (let ((temp-file (test--create-temp-script "#!/bin/bash\necho hello")))
+    (unwind-protect
+        (progn
+          (set-file-modes temp-file #o755)
+          (with-current-buffer (find-file-noselect temp-file)
+            (should (test--file-executable-p temp-file))
+            (cj/make-script-executable)  ; should not error
+            (should (test--file-executable-p temp-file))
+            (kill-buffer)))
+      (delete-file temp-file))))
+
+;;; Boundary Cases
+
+(ert-deftest test-make-script-executable-boundary-no-shebang ()
+  "File without shebang is NOT made executable."
+  (let ((temp-file (test--create-temp-script "echo hello\n# no shebang")))
+    (unwind-protect
+        (with-current-buffer (find-file-noselect temp-file)
+          (should-not (test--file-executable-p temp-file))
+          (cj/make-script-executable)
+          (should-not (test--file-executable-p temp-file))
+          (kill-buffer))
+      (delete-file temp-file))))
+
+(ert-deftest test-make-script-executable-boundary-empty-file ()
+  "Empty file is NOT made executable."
+  (let ((temp-file (test--create-temp-script "")))
+    (unwind-protect
+        (with-current-buffer (find-file-noselect temp-file)
+          (should-not (test--file-executable-p temp-file))
+          (cj/make-script-executable)
+          (should-not (test--file-executable-p temp-file))
+          (kill-buffer))
+      (delete-file temp-file))))
+
+(ert-deftest test-make-script-executable-boundary-shebang-line-two ()
+  "Shebang on line 2 (not line 1) does NOT make file executable."
+  (let ((temp-file (test--create-temp-script "\n#!/bin/bash\necho hello")))
+    (unwind-protect
+        (with-current-buffer (find-file-noselect temp-file)
+          (should-not (test--file-executable-p temp-file))
+          (cj/make-script-executable)
+          (should-not (test--file-executable-p temp-file))
+          (kill-buffer))
+      (delete-file temp-file))))
+
+(ert-deftest test-make-script-executable-boundary-hash-but-not-shebang ()
+  "File starting with # but not #! is NOT made executable."
+  (let ((temp-file (test--create-temp-script "# This is a comment\necho hello")))
+    (unwind-protect
+        (with-current-buffer (find-file-noselect temp-file)
+          (should-not (test--file-executable-p temp-file))
+          (cj/make-script-executable)
+          (should-not (test--file-executable-p temp-file))
+          (kill-buffer))
+      (delete-file temp-file))))
+
+;;; Edge Cases
+
+(ert-deftest test-make-script-executable-edge-no-buffer-file ()
+  "Buffer not visiting a file does not error."
+  (with-temp-buffer
+    (insert "#!/bin/bash\necho hello")
+    (should-not buffer-file-name)
+    (cj/make-script-executable)))  ; should not error
+
+(ert-deftest test-make-script-executable-edge-shebang-with-space ()
+  "Shebang with space after #! still works."
+  (let ((temp-file (test--create-temp-script "#! /bin/bash\necho hello")))
+    (unwind-protect
+        (with-current-buffer (find-file-noselect temp-file)
+          (should-not (test--file-executable-p temp-file))
+          (cj/make-script-executable)
+          (should (test--file-executable-p temp-file))
+          (kill-buffer))
+      (delete-file temp-file))))
+
+(provide 'test-prog-shell--make-script-executable)
+;;; test-prog-shell--make-script-executable.el ends here