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+;;; test-ai-config-gptel-backend-libs.el --- Tests for gptel backend-lib loading -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Regression coverage for the "gptel-make-anthropic void" bug.  The local
+;; gptel fork (:load-path "~/code/gptel", :ensure nil) ships no generated
+;; autoloads, so (require 'gptel) alone never loads gptel-anthropic /
+;; gptel-openai where the gptel-make-* constructors live.  The fix is to
+;; require those backend libraries explicitly before constructing backends.
+;;
+;; These tests don't load gptel itself (it isn't reliably loadable in batch);
+;; they stub `require' and the constructors to verify the loader requires both
+;; libs and that `cj/ensure-gptel-backends' calls it before building backends.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'ai-config)
+
+;; gptel defvars these at runtime; declare them here so the wiring test can
+;; let-bind them in a batch session where gptel itself is not loaded.
+(defvar gptel-backend)
+(defvar gptel-model)
+
+(ert-deftest test-ai-config-gptel-load-backend-libs-requires-both ()
+  "Normal: the loader requires gptel-anthropic and gptel-openai so the fork's
+make-* constructors exist despite the missing autoloads."
+  (let ((required '()))
+    (cl-letf (((symbol-function 'require)
+               (lambda (feature &rest _) (push feature required) feature)))
+      (cj/--gptel-load-backend-libs))
+    (should (memq 'gptel-anthropic required))
+    (should (memq 'gptel-openai required))))
+
+(ert-deftest test-ai-config-ensure-gptel-backends-loads-libs-first ()
+  "Regression: `cj/ensure-gptel-backends' loads the backend libs before it
+calls the constructors, so a fork without autoloads no longer signals
+`void-function gptel-make-anthropic'."
+  (let ((loaded nil)
+        (gptel-claude-backend nil)
+        (gptel-chatgpt-backend nil)
+        (gptel-backend nil)
+        (gptel-model nil))
+    (cl-letf (((symbol-function 'cj/--gptel-load-backend-libs)
+               (lambda () (setq loaded t)))
+              ((symbol-function 'gptel-make-anthropic) (lambda (&rest _) 'claude))
+              ((symbol-function 'gptel-make-openai) (lambda (&rest _) 'chatgpt))
+              ((symbol-function 'cj/anthropic-api-key) (lambda () "k"))
+              ((symbol-function 'cj/openai-api-key) (lambda () "k")))
+      (cj/ensure-gptel-backends))
+    (should loaded)
+    (should (eq gptel-claude-backend 'claude))
+    (should (eq gptel-chatgpt-backend 'chatgpt))))
+
+(provide 'test-ai-config-gptel-backend-libs)
+;;; test-ai-config-gptel-backend-libs.el ends here