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;;; test-prog-yaml--yaml-format-buffer.el --- Tests for cj/yaml-format-buffer -*- lexical-binding: t -*-
;;; Commentary:
;; Tests for the cj/yaml-format-buffer function in prog-yaml.el.
;;; Code:
(require 'ert)
(require 'cl-lib)
(require 'prog-yaml)
;;; argv path — process invocation (stubbed, no shell)
(ert-deftest test-prog-yaml--yaml-format-buffer-invokes-prettier-argv ()
"Normal: with prettier present, the formatter calls it via argv, no shell."
(let (program args)
(cl-letf (((symbol-function 'executable-find) (lambda (_p) "/usr/bin/prettier"))
((symbol-function 'call-process-region)
(lambda (_start _end prog &rest rest)
(setq program prog
args (nthcdr 3 rest))
(with-current-buffer (nth 1 rest) (insert "key: value\n"))
0)))
(with-temp-buffer
(insert "key: value\n")
(cj/yaml-format-buffer)))
(should (equal "prettier" program))
(should (equal '("--parser" "yaml") args))))
(ert-deftest test-prog-yaml--yaml-format-buffer-no-clobber-on-failure ()
"Error: a non-zero prettier exit leaves the buffer untouched and errors."
(cl-letf (((symbol-function 'executable-find) (lambda (_p) "/usr/bin/prettier"))
((symbol-function 'call-process-region)
(lambda (_start _end _prog _delete buffer &rest _)
(with-current-buffer buffer (insert "[error] bad yaml"))
1)))
(with-temp-buffer
(insert "key: : bad\n")
(should-error (cj/yaml-format-buffer) :type 'user-error)
(should (string= (buffer-string) "key: : bad\n")))))
;;; Normal Cases
(ert-deftest test-prog-yaml--yaml-format-buffer-normal-fixes-indentation ()
"Badly indented YAML is normalized to 2-space indent."
(with-temp-buffer
(insert "items:\n - one\n - two\n")
(cj/yaml-format-buffer)
(should (string= (buffer-string) "items:\n - one\n - two\n"))))
(ert-deftest test-prog-yaml--yaml-format-buffer-normal-nested-map ()
"Nested map with inconsistent indentation is normalized."
(with-temp-buffer
(insert "server:\n host: localhost\n port: 8080\n")
(cj/yaml-format-buffer)
(should (string= (buffer-string) "server:\n host: localhost\n port: 8080\n"))))
(ert-deftest test-prog-yaml--yaml-format-buffer-normal-already-formatted ()
"Already well-formatted YAML is unchanged."
(let ((formatted "name: test\nversion: 1.0\n"))
(with-temp-buffer
(insert formatted)
(cj/yaml-format-buffer)
(should (string= (buffer-string) formatted)))))
(ert-deftest test-prog-yaml--yaml-format-buffer-normal-preserves-key-order ()
"Key order is preserved (not sorted)."
(with-temp-buffer
(insert "zebra: 1\nalpha: 2\n")
(cj/yaml-format-buffer)
(should (string-match-p "zebra.*\nalpha" (buffer-string)))))
;;; Boundary Cases
(ert-deftest test-prog-yaml--yaml-format-buffer-boundary-empty-document ()
"Empty YAML document formats without error."
(with-temp-buffer
(insert "")
(cj/yaml-format-buffer)
(should (string= (string-trim (buffer-string)) ""))))
(ert-deftest test-prog-yaml--yaml-format-buffer-boundary-single-key ()
"Single key-value pair formats cleanly."
(with-temp-buffer
(insert "key: value\n")
(cj/yaml-format-buffer)
(should (string= (buffer-string) "key: value\n"))))
(ert-deftest test-prog-yaml--yaml-format-buffer-boundary-unicode ()
"YAML with unicode values is preserved."
(with-temp-buffer
(insert "name: café\ncity: Zürich\n")
(cj/yaml-format-buffer)
(should (string-match-p "café" (buffer-string)))
(should (string-match-p "Zürich" (buffer-string)))))
;;; Error Cases
(ert-deftest test-prog-yaml--yaml-format-buffer-error-no-prettier ()
"Signals user-error when prettier is not found."
(cl-letf (((symbol-function 'executable-find) (lambda (_) nil)))
(with-temp-buffer
(insert "key: value\n")
(should-error (cj/yaml-format-buffer) :type 'user-error))))
(provide 'test-prog-yaml--yaml-format-buffer)
;;; test-prog-yaml--yaml-format-buffer.el ends here
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