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+;;; test-dev-fkeys--f4-compile-and-run-impl.el --- Tests for cj/--f4-compile-and-run-impl -*- lexical-binding: t -*-
+
+;;; Commentary:
+;; Tests for the "Compile + Run" action handler. After kicking off the
+;; compile, attaches a one-shot `compilation-finish-functions' hook that
+;; runs the project on success.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'dev-fkeys)
+
+;;; Normal Cases
+
+(ert-deftest test-dev-fkeys-compile-and-run-impl-invokes-projectile-compile ()
+  "Normal: handler calls `projectile-compile-project'.
+
+Components integrated:
+- `cj/--f4-compile-and-run-impl' (unit under test)
+- `projectile-compile-project' (MOCKED via cl-letf)
+- `compilation-finish-functions' (real, scoped via let)"
+  (let ((compile-calls 0)
+        (compilation-finish-functions nil))
+    (cl-letf (((symbol-function 'projectile-compile-project)
+               (lambda (_arg) (cl-incf compile-calls))))
+      (cj/--f4-compile-and-run-impl)
+      (should (= compile-calls 1)))))
+
+(ert-deftest test-dev-fkeys-compile-and-run-impl-installs-finish-hook ()
+  "Normal: handler installs exactly one hook in `compilation-finish-functions'."
+  (let ((compilation-finish-functions nil))
+    (cl-letf (((symbol-function 'projectile-compile-project)
+               (lambda (_arg) nil)))
+      (cj/--f4-compile-and-run-impl)
+      (should (= (length compilation-finish-functions) 1)))))
+
+(ert-deftest test-dev-fkeys-compile-and-run-impl-hook-runs-projectile-run-on-success ()
+  "Normal: when the compile finishes successfully, the installed hook calls
+`projectile-run-project'.
+
+Components integrated:
+- `cj/--f4-compile-and-run-impl' (unit under test)
+- `projectile-compile-project' (MOCKED — no-op)
+- `projectile-run-project' (MOCKED — counts calls)
+- `compilation-finish-functions' (real)
+- `run-hook-with-args' (real — simulates compile.el firing the hook)"
+  (let ((run-calls 0)
+        (compilation-finish-functions nil))
+    (cl-letf (((symbol-function 'projectile-compile-project)
+               (lambda (_arg) nil))
+              ((symbol-function 'projectile-run-project)
+               (lambda (_arg) (cl-incf run-calls))))
+      (cj/--f4-compile-and-run-impl)
+      (run-hook-with-args 'compilation-finish-functions nil "finished\n")
+      (should (= run-calls 1)))))
+
+;;; Boundary Cases
+
+(ert-deftest test-dev-fkeys-compile-and-run-impl-hook-skips-projectile-run-on-failure ()
+  "Boundary: when the compile fails, projectile-run-project must not run.
+The hook still self-removes (covered in the make-once-hook tests)."
+  (let ((run-calls 0)
+        (compilation-finish-functions nil))
+    (cl-letf (((symbol-function 'projectile-compile-project)
+               (lambda (_arg) nil))
+              ((symbol-function 'projectile-run-project)
+               (lambda (_arg) (cl-incf run-calls))))
+      (cj/--f4-compile-and-run-impl)
+      (run-hook-with-args 'compilation-finish-functions nil "exited abnormally\n")
+      (should (= run-calls 0)))))
+
+(provide 'test-dev-fkeys--f4-compile-and-run-impl)
+;;; test-dev-fkeys--f4-compile-and-run-impl.el ends here