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;;; modus-themes-test.el --- Unit tests for the Modus themes -*- lexical-binding: t -*-
;; Copyright (C) 2025-2026 Free Software Foundation, Inc.
;; Author: Rudolf Adamkovič <rudolf@adamkovic.org>,
;; Protesilaos Stavrou <info@protesilaos.com>
;; Maintainer: Protesilaos Stavrou <info@protesilaos.com>
;; URL: https://github.com/protesilaos/modus-themes
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Tests for the Modus themes. Note that we are using Shorthands in
;; this file, so the "mtt-" prefix really is "modus-themes-test-".
;; Evaluate the following to learn more:
;;
;; (info "(elisp) Shorthands")
;;; Code:
(require 'ert)
(require 'modus-themes)
(ert-deftest mtt-modus-themes--hex-to-rgb ()
"Test that `modus-themes--hex-to-rgb' does what it is supposed to."
(should (equal (modus-themes--hex-to-rgb "#fff") (list 1.0 1.0 1.0)))
(should (equal (modus-themes--hex-to-rgb "#000") (list 0.0 0.0 0.0)))
(should (equal (modus-themes--hex-to-rgb "#f00") (list 1.0 0.0 0.0)))
(should (equal (modus-themes--hex-to-rgb "#0f0") (list 0.0 1.0 0.0)))
(should (equal (modus-themes--hex-to-rgb "#00f") (list 0.0 0.0 1.0)))
(should (equal (modus-themes--hex-to-rgb "#ffffff") (list 1.0 1.0 1.0)))
(should (equal (modus-themes--hex-to-rgb "#000000") (list 0.0 0.0 0.0)))
(should (equal (modus-themes--hex-to-rgb "#ff0000") (list 1.0 0.0 0.0)))
(should (equal (modus-themes--hex-to-rgb "#00ff00") (list 0.0 1.0 0.0)))
(should (equal (modus-themes--hex-to-rgb "#0000ff") (list 0.0 0.0 1.0)))
(let ((rgb-rounded-fn
(lambda (hex)
(let ((rgb (modus-themes--hex-to-rgb hex)))
(mapcar (lambda (float) (string-to-number (format "%.2f" float))) rgb)))))
(should (equal (funcall rgb-rounded-fn "#800000") (list 0.5 0.0 0.0)))
(should (equal (funcall rgb-rounded-fn "#008000") (list 0.0 0.5 0.0)))
(should (equal (funcall rgb-rounded-fn "#000080") (list 0.0 0.0 0.5))))
(should-not (modus-themes--hex-to-rgb ""))
(should-not (modus-themes--hex-to-rgb "#"))
(should-not (modus-themes--hex-to-rgb "#1"))
(should-not (modus-themes--hex-to-rgb "#12"))
(should-not (modus-themes--hex-to-rgb "#1234"))
(should-not (modus-themes--hex-to-rgb "#12345"))
(should-not (modus-themes--hex-to-rgb "#gggggg"))
(should-error (modus-themes--hex-to-rgb (list 1.0 1.0 1.0))))
(ert-deftest mtt-modus-themes-wcag-formula ()
"Test that `modus-themes-wcag-formula' does the right thing.
Also see `modus-themes-test--modus-themes--hex-to-rgb'."
(should (= (modus-themes-wcag-formula "#ffffff") 1.0))
(should (= (modus-themes-wcag-formula "#000000") 0.0))
(should-not (modus-themes-wcag-formula "#00000")))
(ert-deftest mtt-modus-themes-contrast ()
"Test that `modus-themes-contrast' works as intended.
Also see `modus-themes-test--modus-themes--hex-to-rgb'."
(should (= (modus-themes-contrast "#ffffff" "#000000") 21.0))
(should (= (modus-themes-contrast "#000000" "#ffffff") 21.0))
(let ((float-2-fn (lambda (hex1 hex2)
(string-to-number (format "%.2f" (modus-themes-contrast hex1 hex2))))))
(should (= (funcall float-2-fn "#ff0000" "#ffffff") 4.0))
(should (= (funcall float-2-fn "#00ff00" "#ffffff") 1.37))
(should (= (funcall float-2-fn "#0000ff" "#ffffff") 8.59))
(should (= (funcall float-2-fn "#ffff00" "#ffffff") 1.07))
(should (= (funcall float-2-fn "#00ffff" "#ffffff") 1.25))
(should (= (funcall float-2-fn "#ff00ff" "#ffffff") 3.14)))
(should-error (modus-themes-contrast "#ffffff" "#00000"))
(should-error (modus-themes-contrast "#fffff" "#00000")))
(ert-deftest mtt-inheritance ()
"Ensure all faces inherit from valid faces."
;; Third-party packages, loaded if possible to better test face inheritance.
(require 'font-latex nil t)
(let ((current-theme (modus-themes-get-current-theme)))
(unwind-protect
(progn
(modus-themes-load-theme 'modus-operandi)
(should-not (seq-filter
(lambda (face)
;; The face either has no parent ...
(if-let* ((parent (face-attribute face :inherit)))
(and (symbolp parent)
(not (eq parent 'unspecified))
;; ... or its parent is a valid face.
(not (facep parent)))))
(face-list))))
(modus-themes-load-theme current-theme))))
(ert-deftest mtt-color-dark-p ()
"Test `modus-themes-color-dark-p'."
(let ((modus-operandi-sample-foregrounds
'("#a60000"
"#972500"
"#a0132f"
"#7f0000"
"#006800"
"#316500"
"#00663f"
"#2a5045"
"#6f5500"
"#884900"
"#7a4f2f"
"#624416"
"#0031a9"
"#3548cf"
"#0000b0"
"#003497"
"#721045"
"#8f0075"
"#531ab6"
"#7c318f"
"#005e8b"
"#3f578f"
"#005f5f"
"#005077"))
(modus-vivendi-sample-foregrounds
'("#ff5f59"
"#ff6b55"
"#ff7f86"
"#ff9580"
"#44bc44"
"#70b900"
"#00c06f"
"#88ca9f"
"#d0bc00"
"#fec43f"
"#dfaf7a"
"#d2b580"
"#2fafff"
"#79a8ff"
"#00bcff"
"#82b0ec"
"#feacd0"
"#f78fe7"
"#b6a0ff"
"#caa6df"
"#00d3d0"
"#4ae2f0"
"#6ae4b9"
"#9ac8e0")))
(should (seq-every-p #'modus-themes-color-dark-p modus-operandi-sample-foregrounds))
(should-not (seq-every-p #'modus-themes-color-dark-p modus-vivendi-sample-foregrounds))))
(ert-deftest mtt-get-readable-foreground ()
"Test `modus-themes-get-readable-foreground'."
(let ((modus-operandi-sample-foregrounds
'("#a60000"
"#972500"
"#a0132f"
"#7f0000"
"#006800"
"#316500"
"#00663f"
"#2a5045"
"#6f5500"
"#884900"
"#7a4f2f"
"#624416"
"#0031a9"
"#3548cf"
"#0000b0"
"#003497"
"#721045"
"#8f0075"
"#531ab6"
"#7c318f"
"#005e8b"
"#3f578f"
"#005f5f"
"#005077"))
(modus-vivendi-sample-foregrounds
'("#ff5f59"
"#ff6b55"
"#ff7f86"
"#ff9580"
"#44bc44"
"#70b900"
"#00c06f"
"#88ca9f"
"#d0bc00"
"#fec43f"
"#dfaf7a"
"#d2b580"
"#2fafff"
"#79a8ff"
"#00bcff"
"#82b0ec"
"#feacd0"
"#f78fe7"
"#b6a0ff"
"#caa6df"
"#00d3d0"
"#4ae2f0"
"#6ae4b9"
"#9ac8e0")))
(should (seq-every-p
(lambda (value)
(string= value "#ffffff"))
(mapcar #'modus-themes-get-readable-foreground modus-operandi-sample-foregrounds)))
(should (seq-every-p
(lambda (value)
(string= value "#000000"))
(mapcar #'modus-themes-get-readable-foreground modus-vivendi-sample-foregrounds)))))
(provide 'modus-themes-test)
;;; modus-themes-test.el ends here
;; Local Variables:
;; read-symbol-shorthands: (("mtt" . "modus-themes-test-"))
;; End:
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