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diff --git a/tests/test-system-utils-eval-buffer.el b/tests/test-system-utils-eval-buffer.el
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+;;; test-system-utils-eval-buffer.el --- Tests for cj/eval-buffer-with-confirmation-or-error-message -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Unit tests for `cj/eval-buffer-with-confirmation-or-error-message'
+;; in system-utils.el.  The function evaluates the current buffer and
+;; reports success or any signaled error via `message', so errors
+;; don't propagate to the caller.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'system-utils)
+
+(defmacro test-sueb--capture-message (var &rest body)
+  "Run BODY with `message' stubbed to set VAR to the formatted string."
+  (declare (indent 1))
+  `(cl-letf (((symbol-function 'message)
+			  (lambda (fmt &rest args)
+				(setq ,var (apply #'format fmt args)))))
+	 ,@body))
+
+;;; Normal cases
+
+(ert-deftest test-sueb-valid-elisp-reports-success ()
+  "Normal: evaluating valid elisp reports \"Buffer evaluated.\" via message."
+  (let (captured)
+	(test-sueb--capture-message captured
+	  (with-temp-buffer
+		(emacs-lisp-mode)
+		(insert "(+ 1 2)")
+		(cj/eval-buffer-with-confirmation-or-error-message)))
+	(should (string-match-p "Buffer evaluated" captured))))
+
+;;; Boundary cases
+
+(ert-deftest test-sueb-empty-buffer-reports-success ()
+  "Boundary: an empty buffer evaluates to nil cleanly and reports success."
+  (let (captured)
+	(test-sueb--capture-message captured
+	  (with-temp-buffer
+		(emacs-lisp-mode)
+		(cj/eval-buffer-with-confirmation-or-error-message)))
+	(should (string-match-p "Buffer evaluated" captured))))
+
+;;; Error cases
+
+(ert-deftest test-sueb-error-caught-not-propagated ()
+  "Error: evaluation of broken code reports the error via message without signaling.
+Proves the condition-case wrapper catches errors rather than propagating them."
+  (let (captured)
+	(test-sueb--capture-message captured
+	  (with-temp-buffer
+		(emacs-lisp-mode)
+		(insert "(this-function-does-not-exist-for-testing)")
+		(cj/eval-buffer-with-confirmation-or-error-message)))
+	(should (string-match-p "Error occurred during evaluation" captured))))
+
+(provide 'test-system-utils-eval-buffer)
+;;; test-system-utils-eval-buffer.el ends here