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;;; flycheck-buttercup.el --- Flycheck: Extensions to Buttercup -*- lexical-binding: t; -*-
;; Copyright (C) 2017 Flycheck contributors
;; Copyright (C) 2016 Sebastian Wiesner and Flycheck contributors
;; Author: Sebastian Wiesner <swiesner@lunaryorn.com>
;; Maintainer: Clément Pit-Claudel <clement.pitclaudel@live.com>
;; fmdkdd <fmdkdd@gmail.com>
;; Keywords: lisp, tools
;; This file is not part of GNU Emacs.
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Extensions to Buttercup to write BDD tests for Flycheck.
;;
;; Buttercup is a BDD testing framework for Emacs, see URL
;; `https://github.com/jorgenschaefer/emacs-buttercup/'. Flycheck uses
;; Buttercup extensively for new tests.
;;
;; This library provides extensions to Buttercup to write Specs for Flycheck.
;;
;; * Custom matchers
;;
;; (expect 'foo :to-be-local) - Is `foo' a local variable in the current buffer?
;;; Code:
(require 'buttercup)
(require 'flycheck)
(require 'seq)
;;; Buttercup helpers
(defun flycheck-buttercup-format-error-list (errors)
"Format ERRORS into a human-readable string."
(mapconcat (lambda (e) (flycheck-error-format e 'with-file-name))
errors "\n"))
;;; Data matchers
(buttercup-define-matcher :to-be-empty-string (s)
(let ((s (funcall s)))
(if (equal s "")
(cons t (format "Expected %S not be an empty string" s))
(cons nil (format "Expected %S to be an empty string" s)))))
(buttercup-define-matcher :to-match-with-group (re s index match)
(let* ((re (funcall re))
(s (funcall s))
(index (funcall index))
(match (funcall match))
(matches? (string-match re s))
(result (and matches? (match-string index s))))
(if (and matches? (equal result match))
(cons t (format "Expected %S not to match %S with %S in group %s"
re s match index))
(cons nil (format "Expected %S to match %S with %S in group %s, %s"
re s match index
(if matches?
(format "but got %S" result)
"but did not match"))))))
;;; Emacs feature matchers
(buttercup-define-matcher :to-be-live (buffer)
(let ((buffer (get-buffer (funcall buffer))))
(if (buffer-live-p buffer)
(cons t (format "Expected %S not to be a live buffer, but it is"
buffer))
(cons nil (format "Expected %S to be a live buffer, but it is not"
buffer)))))
(buttercup-define-matcher :to-be-visible (buffer)
(let ((buffer (get-buffer (funcall buffer))))
(cond
((and buffer (get-buffer-window buffer))
(cons t (format "Expected %S not to be a visible buffer, but it is"
buffer)))
((not (bufferp buffer))
(cons nil
(format "Expected %S to be a visible buffer, but it is not a buffer"
buffer)))
(t (cons
nil
(format "Expected %S to be a visible buffer, but it is not visible"
buffer))))))
(buttercup-define-matcher :to-be-local (symbol)
(let ((symbol (funcall symbol)))
(if (local-variable-p symbol)
(cons t (format "Expected %S not to be a local variable, but it is"
symbol))
(cons nil (format "Expected %S to be a local variable, but it is not"
symbol)))))
(buttercup-define-matcher :to-contain-match (buffer re)
(let ((buffer (funcall buffer))
(re (funcall re)))
(if (not (get-buffer buffer))
(cons nil (format "Expected %S to contain a match of %s, \
but is not a buffer" buffer re))
(with-current-buffer buffer
(save-excursion
(goto-char (point-min))
(if (re-search-forward re nil 'noerror)
(cons t (format "Expected %S to contain a match \
for %s, but it did not" buffer re))
(cons nil (format "Expected %S not to contain a match for \
%s but it did not." buffer re))))))))
;;; Flycheck matchers
(buttercup-define-matcher :to-be-equal-flycheck-errors (a b)
(let* ((a (funcall a))
(b (funcall b))
(a-formatted (flycheck-buttercup-format-error-list a))
(b-formatted (flycheck-buttercup-format-error-list b)))
(if (equal a b)
(cons t (format "Expected
%s
not to be equal to
%s" a-formatted b-formatted))
(cons nil (format "Expected
%s
to be equal to
%s" a-formatted b-formatted)))))
(provide 'flycheck-buttercup)
;; Disable byte compilation for this library, to prevent package.el choking on a
;; missing `buttercup' library. See
;; https://github.com/flycheck/flycheck/issues/860
;; Local Variables:
;; no-byte-compile: t
;; End:
;;; flycheck-buttercup.el ends here
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