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+;;; test-dev-fkeys--f4-candidates.el --- Tests for cj/--f4-candidates -*- lexical-binding: t -*-
+
+;;; Commentary:
+;; Tests for the candidate-menu builder. Returns an alist of
+;; (LABEL . ACTION) for the F4 completing-read prompt. The first entry
+;; is the default (selected on RET).
+
+;;; Code:
+
+(require 'ert)
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'dev-fkeys)
+
+;;; Normal Cases
+
+(ert-deftest test-dev-fkeys-f4-candidates-compiled-has-four-entries ()
+  "Normal: compiled project gets all four candidates."
+  (let ((cands (cj/--f4-candidates 'compiled)))
+    (should (= (length cands) 4))))
+
+(ert-deftest test-dev-fkeys-f4-candidates-compiled-default-is-compile-and-run ()
+  "Normal: first candidate for compiled is Compile + Run (the default)."
+  (let ((cands (cj/--f4-candidates 'compiled)))
+    (should (equal (caar cands) "Compile + Run"))
+    (should (eq (cdar cands) 'compile-and-run))))
+
+(ert-deftest test-dev-fkeys-f4-candidates-compiled-includes-all-actions ()
+  "Normal: compiled menu maps each label to its action symbol."
+  (let ((cands (cj/--f4-candidates 'compiled)))
+    (should (eq (cdr (assoc "Compile + Run" cands))   'compile-and-run))
+    (should (eq (cdr (assoc "Compile" cands))         'compile-only))
+    (should (eq (cdr (assoc "Run" cands))             'run-only))
+    (should (eq (cdr (assoc "Clean + Rebuild" cands)) 'clean-rebuild))))
+
+(ert-deftest test-dev-fkeys-f4-candidates-interpreted-is-run-only ()
+  "Normal: interpreted project gets a single Run candidate."
+  (let ((cands (cj/--f4-candidates 'interpreted)))
+    (should (= (length cands) 1))
+    (should (equal (caar cands) "Run"))
+    (should (eq (cdar cands) 'run-only))))
+
+(ert-deftest test-dev-fkeys-f4-candidates-unknown-is-compile-plain ()
+  "Normal: unknown project gets a single Compile candidate that calls plain compile."
+  (let ((cands (cj/--f4-candidates 'unknown)))
+    (should (= (length cands) 1))
+    (should (equal (caar cands) "Compile"))
+    (should (eq (cdar cands) 'compile-plain))))
+
+;;; Boundary Cases
+
+(ert-deftest test-dev-fkeys-f4-candidates-bogus-symbol-falls-back-to-unknown ()
+  "Boundary: an unrecognized project-type symbol falls through to the unknown branch."
+  (let ((cands (cj/--f4-candidates 'fictional-type)))
+    (should (= (length cands) 1))
+    (should (eq (cdar cands) 'compile-plain))))
+
+;;; Error Cases
+
+(ert-deftest test-dev-fkeys-f4-candidates-nil-falls-back-to-unknown ()
+  "Error: nil project-type falls through to the unknown branch."
+  (let ((cands (cj/--f4-candidates nil)))
+    (should (= (length cands) 1))
+    (should (eq (cdar cands) 'compile-plain))))
+
+(provide 'test-dev-fkeys--f4-candidates)
+;;; test-dev-fkeys--f4-candidates.el ends here