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diff --git a/tests/test-dev-fkeys--projectile-reset-cmds.el b/tests/test-dev-fkeys--projectile-reset-cmds.el
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+;;; test-dev-fkeys--projectile-reset-cmds.el --- Tests for cj/projectile-reset-cmds -*- lexical-binding: t -*-
+
+;;; Commentary:
+;; Tests for the manual escape-hatch command that clears projectile's
+;; per-project compile / test / run cache for the current project. Use
+;; case: projectile's auto-derived default was wrong to begin with and
+;; you want to reset to projectile's default-derived cmd at the next
+;; prompt.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'dev-fkeys)
+
+(defvar projectile-compile-cmd-map nil)
+(defvar projectile-test-cmd-map nil)
+(defvar projectile-run-cmd-map nil)
+
+;;; Normal Cases
+
+(ert-deftest test-dev-fkeys-projectile-reset-cmds-clears-all-three-maps ()
+  "Normal: clears compile, test, and run cache entries for the current root.
+Other projects' entries are left alone."
+  (let ((projectile-compile-cmd-map (make-hash-table :test 'equal))
+        (projectile-test-cmd-map    (make-hash-table :test 'equal))
+        (projectile-run-cmd-map     (make-hash-table :test 'equal)))
+    (puthash "/p/" "make"      projectile-compile-cmd-map)
+    (puthash "/p/" "make test" projectile-test-cmd-map)
+    (puthash "/p/" "./run.sh"  projectile-run-cmd-map)
+    (puthash "/other/" "untouched" projectile-compile-cmd-map)
+    (cl-letf (((symbol-function 'cj/--f4-project-root) (lambda () "/p/")))
+      (cj/projectile-reset-cmds))
+    (should-not (gethash "/p/" projectile-compile-cmd-map))
+    (should-not (gethash "/p/" projectile-test-cmd-map))
+    (should-not (gethash "/p/" projectile-run-cmd-map))
+    (should (string= (gethash "/other/" projectile-compile-cmd-map) "untouched"))))
+
+;;; Boundary Cases
+
+(ert-deftest test-dev-fkeys-projectile-reset-cmds-no-cached-entry-is-noop ()
+  "Boundary: project root has no cached entries → command runs cleanly,
+no error, maps stay empty."
+  (let ((projectile-compile-cmd-map (make-hash-table :test 'equal))
+        (projectile-test-cmd-map    (make-hash-table :test 'equal))
+        (projectile-run-cmd-map     (make-hash-table :test 'equal)))
+    (cl-letf (((symbol-function 'cj/--f4-project-root) (lambda () "/p/")))
+      (cj/projectile-reset-cmds))
+    (should (zerop (hash-table-count projectile-compile-cmd-map)))
+    (should (zerop (hash-table-count projectile-test-cmd-map)))
+    (should (zerop (hash-table-count projectile-run-cmd-map)))))
+
+;;; Error Cases
+
+(ert-deftest test-dev-fkeys-projectile-reset-cmds-no-project-signals-user-error ()
+  "Error: no project detected → user-error rather than silent no-op."
+  (cl-letf (((symbol-function 'cj/--f4-project-root) (lambda () nil)))
+    (should-error (cj/projectile-reset-cmds) :type 'user-error)))
+
+(provide 'test-dev-fkeys--projectile-reset-cmds)
+;;; test-dev-fkeys--projectile-reset-cmds.el ends here