;;; css-mode-tests.el --- Test suite for CSS mode  -*- lexical-binding: t; -*-

;; Copyright (C) 2016 Free Software Foundation, Inc.

;; Author: Simen Heggestøyl <simenheg@gmail.com>
;; Keywords: internal

;; This file is 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:

;;; Code:

(require 'css-mode)
(require 'ert)
(require 'seq)

(ert-deftest css-test-property-values ()
  ;; The `float' property has a flat value list.
  (should
   (equal (seq-sort #'string-lessp (css--property-values "float"))
          '("left" "none" "right")))

  ;; The `list-style' property refers to several other properties.
  (should
   (equal (seq-sort #'string-lessp (css--property-values "list-style"))
          (seq-sort
           #'string-lessp
           (seq-uniq
            (append (css--property-values "list-style-type")
                    (css--property-values "list-style-position")
                    (css--property-values "list-style-image"))))))

  ;; The `position' property is tricky because it's also the name of a
  ;; value class.
  (should
   (equal (seq-sort #'string-lessp (css--property-values "position"))
          '("absolute" "fixed" "relative" "static")))

  ;; The `background-position' property should refer to the `position'
  ;; value class, not the property of the same name.
  (should
   (equal (css--property-values "background-position")
          (css--value-class-lookup 'position)))

  ;; Check that the `color' property doesn't cause infinite recursion
  ;; because it refers to the value class of the same name.
  (should (= (length (css--property-values "color")) 147)))

(ert-deftest css-test-property-value-cache ()
  "Test that `css--property-value-cache' is in use."
  (should-not (gethash "word-wrap" css--property-value-cache))
  (let ((word-wrap-values (css--property-values "word-wrap")))
    (should (equal (gethash "word-wrap" css--property-value-cache)
                   word-wrap-values))))

(ert-deftest css-test-property-values-no-duplicates ()
  "Test that `css--property-values' returns no duplicates."
  ;; The `flex' property is prone to duplicate values; if they aren't
  ;; removed, it'll contain at least two instances of `auto'.
  (should
   (equal (seq-sort #'string-lessp (css--property-values "flex"))
          '("auto" "calc()" "content" "none"))))

(ert-deftest css-test-value-class-lookup ()
  (should
   (equal (seq-sort #'string-lessp (css--value-class-lookup 'position))
          '("bottom" "calc()" "center" "left" "right" "top"))))

;;; Completion

(defun css-mode-tests--completions ()
  (let ((data (css-completion-at-point)))
    (all-completions (buffer-substring (nth 0 data) (nth 1 data))
                     (nth 2 data))))

(ert-deftest css-test-complete-bang-rule ()
  (with-temp-buffer
    (css-mode)
    (insert "body { left: 0 !")
    (let ((completions (css-mode-tests--completions)))
      (should (member "important" completions))
      ;; Don't include SCSS bang-rules
      (should-not (member "default" completions)))))

(ert-deftest scss-test-complete-bang-rule ()
  (with-temp-buffer
    (scss-mode)
    (insert "body { left: 0 !")
    (let ((completions (css-mode-tests--completions)))
      (should (member "important" completions))
      (should (member "default" completions)))))

(ert-deftest css-test-complete-property-value ()
  (with-temp-buffer
    (css-mode)
    (insert "body { position: ")
    (let ((completions (css-mode-tests--completions)))
      (should
       (equal (seq-sort #'string-lessp completions)
              '("absolute" "fixed" "inherit" "relative" "static"))))))

(ert-deftest css-test-complete-pseudo-class ()
  (with-temp-buffer
    (css-mode)
    (insert "body:a")
    (let ((completions (css-mode-tests--completions)))
      (should (member "active" completions))
      (should-not (member "disabled" completions))
      ;; Don't include pseudo-elements
      (should-not (member "after" completions)))))

(ert-deftest css-test-complete-pseudo-element ()
  (with-temp-buffer
    (css-mode)
    (insert "body::a")
    (let ((completions (css-mode-tests--completions)))
      (should (member "after" completions))
      (should-not (member "disabled" completions))
      ;; Don't include pseudo-classes
      (should-not (member "active" completions)))))

(ert-deftest css-test-complete-at-rule ()
  (with-temp-buffer
    (css-mode)
    (insert "@m")
    (let ((completions (css-mode-tests--completions)))
      (should (member "media" completions))
      (should-not (member "keyframes" completions))
      ;; Don't include SCSS at-rules
      (should-not (member "mixin" completions)))))

(ert-deftest scss-test-complete-at-rule ()
  (with-temp-buffer
    (scss-mode)
    (insert "@m")
    (let ((completions (css-mode-tests--completions)))
      (should (member "media" completions))
      (should-not (member "keyframes" completions))
      (should (member "mixin" completions)))))

(ert-deftest css-test-complete-property ()
  (with-temp-buffer
    (css-mode)
    (insert "body { f")
    (let ((completions (css-mode-tests--completions)))
      (should (member "filter" completions))
      (should-not (member "position" completions)))))

(ert-deftest css-test-complete-selector ()
  (with-temp-buffer
    (css-mode)
    (insert "b")
    (let ((completions (css-mode-tests--completions)))
      (should (member "body" completions))
      (should-not (member "article" completions)))))

(ert-deftest css-test-complete-nested-selector ()
  (with-temp-buffer
    (css-mode)
    (insert "body {")
    (let ((completions (css-mode-tests--completions)))
      (should-not (member "body" completions)))))

(ert-deftest scss-test-complete-nested-selector ()
  (with-temp-buffer
    (scss-mode)
    (insert "body { b")
    (let ((completions (css-mode-tests--completions)))
      (should (member "body" completions))
      (should-not (member "article" completions)))))

(provide 'css-mode-tests)
;;; css-mode-tests.el ends here