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diff --git a/tests/test-gptel-tools-read-buffer.el b/tests/test-gptel-tools-read-buffer.el
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+++ b/tests/test-gptel-tools-read-buffer.el
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+;;; test-gptel-tools-read-buffer.el --- Tests for read_buffer gptel tool -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for `cj/read-buffer--get-content', the testable helper that
+;; backs the read_buffer gptel tool.
+
+;;; Code:
+
+(require 'ert)
+
+(eval-and-compile
+  (add-to-list 'load-path (expand-file-name "tests" user-emacs-directory))
+  (add-to-list 'load-path (expand-file-name "gptel-tools" user-emacs-directory))
+  (setq load-prefer-newer t)
+  (unless (featurep 'gptel)
+    (defvar gptel-tools nil)
+    (defun gptel-make-tool (&rest _args) nil)
+    (defun gptel-get-tool (&rest _args) nil)
+    (provide 'gptel)))
+
+(require 'read_buffer)
+
+(ert-deftest test-gptel-tools-read-buffer-normal ()
+  "Normal: returns the contents of an existing buffer."
+  (with-temp-buffer
+    (rename-buffer "test-gptel-tools-read-buffer-normal" t)
+    (insert "hello world")
+    (should (equal (cj/read-buffer--get-content (buffer-name)) "hello world"))))
+
+(ert-deftest test-gptel-tools-read-buffer-boundary-empty-buffer ()
+  "Boundary: empty buffer returns the empty string."
+  (with-temp-buffer
+    (rename-buffer "test-gptel-tools-read-buffer-empty" t)
+    (should (equal (cj/read-buffer--get-content (buffer-name)) ""))))
+
+(ert-deftest test-gptel-tools-read-buffer-boundary-buffer-object ()
+  "Boundary: accepts a buffer object as well as a name string."
+  (with-temp-buffer
+    (insert "from buffer object")
+    (should (equal (cj/read-buffer--get-content (current-buffer))
+                   "from buffer object"))))
+
+(ert-deftest test-gptel-tools-read-buffer-boundary-strips-text-properties ()
+  "Boundary: the returned string has no text properties."
+  (with-temp-buffer
+    (rename-buffer "test-gptel-tools-read-buffer-props" t)
+    (insert (propertize "fontified" 'face 'bold))
+    (let ((content (cj/read-buffer--get-content (buffer-name))))
+      (should (equal content "fontified"))
+      (should-not (text-properties-at 0 content)))))
+
+(ert-deftest test-gptel-tools-read-buffer-error-missing-buffer ()
+  "Error: nonexistent buffer name signals."
+  (when (get-buffer "test-gptel-tools-read-buffer-absent")
+    (kill-buffer "test-gptel-tools-read-buffer-absent"))
+  (should-error (cj/read-buffer--get-content
+                 "test-gptel-tools-read-buffer-absent")))
+
+(provide 'test-gptel-tools-read-buffer)
+;;; test-gptel-tools-read-buffer.el ends here