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diff --git a/tests/test-system-utils-commands.el b/tests/test-system-utils-commands.el
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+;;; test-system-utils-commands.el --- Tests for system-utils command wrappers -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Sibling `test-system-utils-eval-buffer.el` covers
+;; `cj/eval-buffer-with-confirmation-or-error-message'.  This batch
+;; covers:
+;;
+;;   cj/open-file-with-command
+;;   cj/server-shutdown
+;;
+;; Process and prompt primitives are stubbed.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'system-utils)
+
+;;; cj/open-file-with-command
+
+(ert-deftest test-system-utils-open-file-with-launcher-uses-call-process ()
+  "Normal: a launcher command (e.g. xdg-open) routes through `call-process'."
+  (let ((tmp (make-temp-file "test-su-open-" nil ".txt"))
+        (call-args nil))
+    (unwind-protect
+        (cl-letf (((symbol-function 'cj/file-from-context)
+                   (lambda () tmp))
+                  ((symbol-function 'cj/external-open-launcher-p)
+                   (lambda (_) t))
+                  ((symbol-function 'call-process)
+                   (lambda (prog _infile _buf _disp &rest args)
+                     (setq call-args (cons prog args))
+                     0))
+                  ((symbol-function 'message) #'ignore))
+          (cj/open-file-with-command "xdg-open"))
+      (delete-file tmp))
+    (should (equal (car call-args) "xdg-open"))
+    (should (member tmp call-args))))
+
+(ert-deftest test-system-utils-open-file-with-non-launcher-uses-shell-process ()
+  "Normal: a non-launcher command goes through `start-process-shell-command'
+and lands in a dedicated output buffer."
+  (let ((tmp (make-temp-file "test-su-open-shell-" nil ".txt"))
+        (shell-cmd nil)
+        (buf-name nil))
+    (unwind-protect
+        (let (output-buf)
+          (cl-letf (((symbol-function 'cj/file-from-context)
+                     (lambda () tmp))
+                    ((symbol-function 'cj/external-open-launcher-p)
+                     (lambda (_) nil))
+                    ((symbol-function 'start-process-shell-command)
+                     (lambda (_name buf cmd)
+                       (setq shell-cmd cmd)
+                       (setq output-buf buf)
+                       'fake-proc))
+                    ((symbol-function 'message) #'ignore))
+            (cj/open-file-with-command "cat"))
+          ;; Capture name as a string before cleanup kills the buffer.
+          (when (bufferp output-buf)
+            (setq buf-name (buffer-name output-buf))
+            (kill-buffer output-buf)))
+      (delete-file tmp))
+    (should (string-prefix-p "cat " shell-cmd))
+    (should (stringp buf-name))
+    (should (string-match-p "^\\*Open with cat:" buf-name))))
+
+(ert-deftest test-system-utils-open-file-with-errors-when-no-valid-file ()
+  "Error: a missing file (no context, no selection) signals an error."
+  (cl-letf (((symbol-function 'cj/file-from-context) (lambda () nil))
+            ((symbol-function 'read-file-name)
+             (lambda (&rest _) "/no/such/path"))
+            ((symbol-function 'cj/external-open-launcher-p)
+             (lambda (_) t)))
+    (should-error (cj/open-file-with-command "xdg-open") :type 'error)))
+
+;;; cj/server-shutdown
+
+(ert-deftest test-system-utils-server-shutdown-saves-then-kills ()
+  "Normal: shutdown saves buffers and then calls `kill-emacs'."
+  (let ((saved nil)
+        (killed nil))
+    (cl-letf (((symbol-function 'save-some-buffers)
+               (lambda (&rest _) (setq saved t)))
+              ((symbol-function 'kill-emacs)
+               (lambda (&rest _) (setq killed t))))
+      (cj/server-shutdown))
+    (should saved)
+    (should killed)))
+
+(provide 'test-system-utils-commands)
+;;; test-system-utils-commands.el ends here