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+;;; test-user-constants.el --- Tests for user-constants path init -*- lexical-binding: t; -*-
+
+;;; Commentary:
+
+;; user-constants defines the config's path constants and creates the
+;; configured directories/files.  After the split, loading the module is
+;; side-effect-free: creation happens only when
+;; cj/initialize-user-directories-and-files is called (from init.el on real
+;; startup).  These tests sandbox user-emacs-directory and user-home-dir so the
+;; path defconsts resolve into temp dirs, then check that loading creates
+;; nothing, the initializer creates what it should, and the verify-or-create
+;; helpers report required vs optional failures differently.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+;; Declare special so the macro's let-bindings are dynamic — the module
+;; `defvar's user-home-dir at load, which errors if the var is lexically bound.
+;; user-emacs-directory is already special (built-in).
+(defvar user-home-dir)
+
+(defconst test-user-constants--repo-root
+  (file-name-directory
+   (directory-file-name
+    (file-name-directory (or load-file-name buffer-file-name))))
+  "Repository root, derived from this file's location under tests/.")
+
+(defun test-user-constants--load ()
+  "Load user-constants.el fresh from the repo."
+  (load (expand-file-name "modules/user-constants.el"
+                          test-user-constants--repo-root)
+        nil t))
+
+(defmacro test-user-constants--with-sandbox (&rest body)
+  "Load user-constants with paths redirected to temp dirs, run BODY, restore.
+The path defconsts are recomputed against temp `user-home-dir' /
+`user-emacs-directory' so BODY can create into the sandbox.  Afterwards the
+module is reloaded against the real paths so the globals are not left pointing
+at deleted temp directories."
+  (declare (indent 0))
+  `(let ((home (file-name-as-directory (make-temp-file "uc-home-" t)))
+         (emacs (file-name-as-directory (make-temp-file "uc-emacs-" t))))
+     (unwind-protect
+         (let ((user-home-dir home)
+               (user-emacs-directory emacs))
+           (test-user-constants--load)
+           ,@body)
+       (test-user-constants--load)
+       (ignore-errors (delete-directory home t))
+       (ignore-errors (delete-directory emacs t)))))
+
+;;; Loading is side-effect-free
+
+(ert-deftest test-user-constants-loading-creates-no-files ()
+  "Normal: loading the module creates no directories or files.
+The whole point of the split — a bare require must not touch the filesystem."
+  (test-user-constants--with-sandbox
+    (should-not (file-exists-p (expand-file-name "sync" home)))
+    (should-not (file-exists-p (expand-file-name "org" sync-dir)))
+    (should-not (file-exists-p gcal-file))
+    (should-not (file-exists-p schedule-file))))
+
+;;; The initializer creates the configured paths
+
+(ert-deftest test-user-constants-initialize-creates-dirs-and-files ()
+  "Normal: the initializer creates the backbone dirs and the configured files."
+  (test-user-constants--with-sandbox
+    (cj/initialize-user-directories-and-files)
+    (should (file-directory-p sync-dir))
+    (should (file-directory-p org-dir))
+    (should (file-directory-p roam-dir))
+    (should (file-exists-p gcal-file))
+    (should (file-exists-p pcal-file))
+    (should (file-exists-p dcal-file))
+    (should (file-exists-p schedule-file))
+    (should (file-exists-p inbox-file))))
+
+(provide 'test-user-constants)
+;;; test-user-constants.el ends here