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diff --git a/tests/test-test-runner--nil-global-directory.el b/tests/test-test-runner--nil-global-directory.el
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+++ b/tests/test-test-runner--nil-global-directory.el
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+;;; test-test-runner--nil-global-directory.el --- Tests for the no-test-directory path -*- lexical-binding: t -*-
+
+;;; Commentary:
+;; Outside a Projectile project, `cj/test--get-test-directory' falls back
+;; to `cj/test-global-directory', which defaults to nil.  These tests pin
+;; the contract for that nil case: discovery helpers return nil instead
+;; of crashing on (file-directory-p nil), and the interactive commands
+;; signal `user-error' instead of wrong-type-argument.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'test-runner)
+
+(defmacro test-runner-nil-dir--outside-project (&rest body)
+  "Run BODY with no project root and a nil `cj/test-global-directory'."
+  (declare (indent 0))
+  `(let ((cj/test-global-directory nil))
+     (cl-letf (((symbol-function 'cj/test--project-root)
+                (lambda () nil)))
+       ,@body)))
+
+;;; Boundary Cases
+
+(ert-deftest test-test-runner-nil-dir-get-test-directory-returns-nil ()
+  "Boundary: no project and no global dir yields nil, not an error."
+  (test-runner-nil-dir--outside-project
+    (should (null (cj/test--get-test-directory)))))
+
+(ert-deftest test-test-runner-nil-dir-get-test-files-returns-nil ()
+  "Boundary: file discovery returns nil instead of crashing on a nil dir."
+  (test-runner-nil-dir--outside-project
+    (should (null (cj/test--get-test-files)))))
+
+;;; Error Cases
+
+(ert-deftest test-test-runner-nil-dir-load-all-signals-user-error ()
+  "Error: `cj/test-load-all' signals `user-error', not wrong-type-argument."
+  (test-runner-nil-dir--outside-project
+    (should-error (cj/test-load-all) :type 'user-error)))
+
+(ert-deftest test-test-runner-nil-dir-focus-add-signals-user-error ()
+  "Error: `cj/test-focus-add' signals `user-error', not wrong-type-argument."
+  (test-runner-nil-dir--outside-project
+    (should-error (cj/test-focus-add) :type 'user-error)))
+
+(provide 'test-test-runner--nil-global-directory)
+;;; test-test-runner--nil-global-directory.el ends here