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diff --git a/tests/test-ai-term--buffer-name.el b/tests/test-ai-term--buffer-name.el
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+;;; test-ai-term--buffer-name.el --- Tests for cj/--ai-term-buffer-name -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for the buffer-name transform.  Given an absolute project
+;; directory, the helper returns "agent [<basename>]".  The naming pattern
+;; is what the display-buffer-alist rule keys on, so a regression here
+;; silently breaks routing to the right side-window.
+
+;;; Code:
+
+(require 'ert)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'ai-term)
+
+(ert-deftest test-ai-term--buffer-name-normal-project ()
+  "Normal: a typical project path yields agent [<basename>]."
+  (should (equal (cj/--ai-term-buffer-name "/home/cjennings/projects/foo")
+                 "agent [foo]")))
+
+(ert-deftest test-ai-term--buffer-name-trailing-slash ()
+  "Boundary: trailing slash collapses before basename extraction."
+  (should (equal (cj/--ai-term-buffer-name "/home/cjennings/projects/foo/")
+                 "agent [foo]")))
+
+(ert-deftest test-ai-term--buffer-name-dot-prefix-dir ()
+  "Boundary: dot-prefix dirs (.emacs.d) preserve the dot in the basename."
+  (should (equal (cj/--ai-term-buffer-name "/home/cjennings/.emacs.d")
+                 "agent [.emacs.d]")))
+
+(ert-deftest test-ai-term--buffer-name-space-in-basename ()
+  "Boundary: a space in the basename round-trips into the buffer name."
+  (should (equal (cj/--ai-term-buffer-name "/tmp/my work")
+                 "agent [my work]")))
+
+(ert-deftest test-ai-term--buffer-name-deeply-nested ()
+  "Normal: only the last path component is used."
+  (should (equal (cj/--ai-term-buffer-name "/a/b/c/d/e/leaf")
+                 "agent [leaf]")))
+
+(provide 'test-ai-term--buffer-name)
+;;; test-ai-term--buffer-name.el ends here