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;;; test-system-lib--format-region-with-program.el --- Tests for cj/format-region-with-program -*- lexical-binding: t; -*-
;;; Commentary:
;; `cj/format-region-with-program' runs an external formatter over the whole
;; buffer via `call-process-region' (argv, no shell) and replaces the buffer
;; only when the program exits zero. Extracted from the byte-identical
;; per-language helpers in prog-json.el / prog-yaml.el, so this is the first
;; direct unit coverage of the logic. call-process-region is mocked at the
;; boundary (the established pattern in test-prog-json--json-format-buffer.el).
;;; Code:
(require 'ert)
(require 'cl-lib)
(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
(require 'system-lib)
(ert-deftest test-system-lib-format-region-with-program-replaces-on-success ()
"Normal: on exit 0 the buffer is replaced with the program's output, returns t."
(cl-letf (((symbol-function 'call-process-region)
(lambda (_start _end _prog &rest rest)
(with-current-buffer (nth 1 rest) (insert "FORMATTED"))
0)))
(with-temp-buffer
(insert "raw")
(should (eq t (cj/format-region-with-program "fmt")))
(should (equal "FORMATTED" (buffer-string))))))
(ert-deftest test-system-lib-format-region-with-program-forwards-argv ()
"Normal: PROGRAM and ARGS reach call-process-region as argv (no shell)."
(let (got-prog got-args)
(cl-letf (((symbol-function 'call-process-region)
(lambda (_start _end prog &rest rest)
(setq got-prog prog
got-args (nthcdr 3 rest))
(with-current-buffer (nth 1 rest) (insert "x"))
0)))
(with-temp-buffer
(cj/format-region-with-program "jq" "--sort-keys" ".")))
(should (equal "jq" got-prog))
(should (equal '("--sort-keys" ".") got-args))))
(ert-deftest test-system-lib-format-region-with-program-empty-output ()
"Boundary: empty program output empties the buffer and still returns t."
(cl-letf (((symbol-function 'call-process-region)
(lambda (_start _end _prog &rest _rest) 0))) ; writes nothing
(with-temp-buffer
(insert "raw")
(should (eq t (cj/format-region-with-program "fmt")))
(should (equal "" (buffer-string))))))
(ert-deftest test-system-lib-format-region-with-program-nonzero-untouched ()
"Error: a non-zero exit leaves the buffer untouched and signals user-error
carrying the program's stderr text."
(cl-letf (((symbol-function 'call-process-region)
(lambda (_start _end _prog &rest rest)
(with-current-buffer (nth 1 rest) (insert "boom: bad input"))
1)))
(with-temp-buffer
(insert "raw")
(let ((err (should-error (cj/format-region-with-program "fmt")
:type 'user-error)))
(should (string-match-p "boom: bad input" (error-message-string err))))
(should (equal "raw" (buffer-string))))))
(provide 'test-system-lib--format-region-with-program)
;;; test-system-lib--format-region-with-program.el ends here
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