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;;; test-ai-rewrite.el --- Tests for ai-rewrite.el -*- lexical-binding: t; -*-
;;; Commentary:
;; Tests for the directive-picker wrappers around `gptel-rewrite'.
;; `gptel-rewrite' itself is stubbed so the tests verify what the
;; wrappers do (which directive body lands in the hook, which region
;; was captured) without touching the real rewrite UI.
;;; Code:
(require 'ert)
(require 'cl-lib)
(add-to-list 'load-path (expand-file-name "tests" user-emacs-directory))
(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
(require 'testutil-ai-config)
;; Stub the gptel-rewrite surface so the wrapper can dispatch to it
;; without loading the real package. testutil-ai-config provides a
;; non-interactive stub of `gptel-rewrite'; we override it with an
;; interactive recorder that captures the hook-derived directive body
;; and the active region.
(defvar gptel-rewrite-directives-hook nil)
(defvar test-ai-rewrite--captured-directive nil
"Last system-message body produced by the hook during a stub rewrite.")
(defvar test-ai-rewrite--captured-region nil
"Cons (BEG . END) captured from `mark' and `point' at stub-rewrite time.")
(defun gptel-rewrite ()
"Stub: capture the directive body and the active region."
(interactive)
(setq test-ai-rewrite--captured-directive
(run-hook-with-args-until-success 'gptel-rewrite-directives-hook))
(setq test-ai-rewrite--captured-region
(cons (region-beginning) (region-end))))
(require 'ai-rewrite)
;; ---------------------------- defcustom shape
(ert-deftest test-ai-rewrite-directives-defcustom-has-named-entries ()
"Default directives include the names called out in the spec."
(let ((names (mapcar #'car cj/gptel-rewrite-directives)))
(dolist (expected '("terse" "fix-grammar" "refactor-readability"
"add-docstring" "explain-as-comment" "shorten"))
(should (member expected names)))))
(ert-deftest test-ai-rewrite-directives-bodies-are-strings ()
"Every directive body is a non-empty string."
(dolist (entry cj/gptel-rewrite-directives)
(should (stringp (cdr entry)))
(should (> (length (cdr entry)) 0))))
;; ---------------------------- with-directive
(ert-deftest test-ai-rewrite-with-directive-normal ()
"Wrapper injects the directive body and runs gptel-rewrite on the region."
(with-temp-buffer
(insert "first body line\nsecond body line\n")
(let ((test-ai-rewrite--captured-directive nil)
(test-ai-rewrite--captured-region nil)
(cj/gptel-rewrite-directives
'(("test" . "BODY FOR TEST DIRECTIVE"))))
;; Activate the region across both lines
(set-mark (point-min))
(goto-char (point-max))
(activate-mark)
(cj/gptel-rewrite-with-directive "test")
(should (equal test-ai-rewrite--captured-directive
"BODY FOR TEST DIRECTIVE"))
(should test-ai-rewrite--captured-region))))
(ert-deftest test-ai-rewrite-with-directive-error-no-region ()
"No active region signals."
(with-temp-buffer
(insert "no region")
(deactivate-mark)
(should-error (call-interactively #'cj/gptel-rewrite-with-directive))))
(ert-deftest test-ai-rewrite-with-directive-error-unknown-directive ()
"Unknown directive name signals."
(with-temp-buffer
(insert "body")
(set-mark (point-min))
(goto-char (point-max))
(activate-mark)
(let ((cj/gptel-rewrite-directives '(("known" . "x"))))
(should-error
(cj/gptel-rewrite--call-with-directive
"unknown" (point-min) (point-max))))))
(ert-deftest test-ai-rewrite-with-directive-records-last-state ()
"Wrapper records the region and directive name for later redo."
(with-temp-buffer
(insert "abc\ndef\n")
(let ((cj/gptel-rewrite-directives
'(("first" . "FIRST BODY")))
(test-ai-rewrite--captured-directive nil))
(set-mark (point-min))
(goto-char (point-max))
(activate-mark)
(cj/gptel-rewrite-with-directive "first")
(should (equal cj/gptel-rewrite--last-directive "first"))
(should (consp cj/gptel-rewrite--last-region))
(should (markerp (car cj/gptel-rewrite--last-region)))
(should (markerp (cdr cj/gptel-rewrite--last-region))))))
;; ---------------------------- redo
(ert-deftest test-ai-rewrite-redo-normal ()
"Redo replays the last region with a new directive."
(with-temp-buffer
(insert "line1\nline2\nline3\n")
(let* ((cj/gptel-rewrite-directives
'(("first" . "FIRST BODY")
("second" . "SECOND BODY")))
(test-ai-rewrite--captured-directive nil)
(test-ai-rewrite--captured-region nil))
(set-mark (point-min))
(goto-char (point-max))
(activate-mark)
(cj/gptel-rewrite-with-directive "first")
(should (equal test-ai-rewrite--captured-directive "FIRST BODY"))
(let ((first-region test-ai-rewrite--captured-region))
(setq test-ai-rewrite--captured-directive nil)
(setq test-ai-rewrite--captured-region nil)
(cl-letf (((symbol-function 'completing-read)
(lambda (_p choices &rest _) (car choices))))
(cj/gptel-rewrite-redo-with-different-directive))
(should (equal test-ai-rewrite--captured-directive "SECOND BODY"))
(should (equal test-ai-rewrite--captured-region first-region))))))
(ert-deftest test-ai-rewrite-redo-error-no-previous ()
"Redo without prior rewrite signals."
(with-temp-buffer
(setq-local cj/gptel-rewrite--last-region nil)
(should-error (cj/gptel-rewrite-redo-with-different-directive))))
(ert-deftest test-ai-rewrite-redo-excludes-current-directive ()
"Redo's completing-read prompt offers every directive except the last."
(with-temp-buffer
(insert "body")
(let ((cj/gptel-rewrite-directives
'(("a" . "A") ("b" . "B") ("c" . "C")))
(offered nil))
(set-mark (point-min))
(goto-char (point-max))
(activate-mark)
(cj/gptel-rewrite-with-directive "b")
(cl-letf (((symbol-function 'completing-read)
(lambda (_p choices &rest _)
(setq offered choices)
(car choices))))
(cj/gptel-rewrite-redo-with-different-directive))
(should (equal (sort (copy-sequence offered) #'string<)
'("a" "c"))))))
(provide 'test-ai-rewrite)
;;; test-ai-rewrite.el ends here
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