Add a test suite for Color

2 files changed, 214 insertions, 0 deletions

diff --git a/tests/test_color.h b/tests/test_color.h
new file mode 100644
index 0000000000..3633f2746d
--- /dev/null
+++ b/tests/test_color.h
@@ -0,0 +1,213 @@
+/*************************************************************************/
+/*  test_color.h                                                         */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef TEST_COLOR_H
+#define TEST_COLOR_H
+
+#include "core/color.h"
+
+#include "thirdparty/doctest/doctest.h"
+
+namespace TestColor {
+
+TEST_CASE("[Color] Constructor methods") {
+	const Color blue_rgba = Color(0.25098, 0.376471, 1, 0.501961);
+	// HTML currently uses ARGB notation, which is contrary to the CSS standard.
+	// This may be changed to RGBA in 4.0.
+	const Color blue_html = Color::html("#804060ff");
+	const Color blue_hex = Color::hex(0x4060ff80);
+	const Color blue_hex64 = Color::hex64(0x4040'6060'ffff'8080);
+
+	CHECK_MESSAGE(
+			blue_rgba.is_equal_approx(blue_html),
+			"Creation with HTML notation should result in components approximately equal to the default constructor.");
+	CHECK_MESSAGE(
+			blue_rgba.is_equal_approx(blue_hex),
+			"Creation with a 32-bit hexadecimal number should result in components approximately equal to the default constructor.");
+	CHECK_MESSAGE(
+			blue_rgba.is_equal_approx(blue_hex64),
+			"Creation with a 64-bit hexadecimal number should result in components approximately equal to the default constructor.");
+
+	ERR_PRINT_OFF;
+	const Color html_invalid = Color::html("invalid");
+	ERR_PRINT_ON;
+
+	CHECK_MESSAGE(
+			html_invalid.is_equal_approx(Color()),
+			"Creation with invalid HTML notation should result in a Color with the default values.");
+
+	const Color green_rgba = Color(0, 1, 0, 0.25);
+	const Color green_hsva = Color(0, 0, 0).from_hsv(120 / 360.0, 1, 1, 0.25);
+
+	CHECK_MESSAGE(
+			green_rgba.is_equal_approx(green_hsva),
+			"Creation with HSV notation should result in components approximately equal to the default constructor.");
+}
+
+TEST_CASE("[Color] Operators") {
+	const Color blue = Color(0.2, 0.2, 1);
+	const Color dark_red = Color(0.3, 0.1, 0.1);
+
+	// Color components may be negative. Also, the alpha component may be greater than 1.0.
+	CHECK_MESSAGE(
+			(blue + dark_red).is_equal_approx(Color(0.5, 0.3, 1.1, 2)),
+			"Color addition should behave as expected.");
+	CHECK_MESSAGE(
+			(blue - dark_red).is_equal_approx(Color(-0.1, 0.1, 0.9, 0)),
+			"Color subtraction should behave as expected.");
+	CHECK_MESSAGE(
+			(blue * 2).is_equal_approx(Color(0.4, 0.4, 2, 2)),
+			"Color multiplication with a scalar should behave as expected.");
+	CHECK_MESSAGE(
+			(blue / 2).is_equal_approx(Color(0.1, 0.1, 0.5, 0.5)),
+			"Color division with a scalar should behave as expected.");
+	CHECK_MESSAGE(
+			(blue * dark_red).is_equal_approx(Color(0.06, 0.02, 0.1)),
+			"Color multiplication with another Color should behave as expected.");
+	CHECK_MESSAGE(
+			(blue / dark_red).is_equal_approx(Color(0.666667, 2, 10)),
+			"Color division with another Color should behave as expected.");
+	CHECK_MESSAGE(
+			(-blue).is_equal_approx(Color(0.8, 0.8, 0, 0)),
+			"Color negation should behave as expected (affecting the alpha channel, unlike `invert()`).");
+}
+
+TEST_CASE("[Color] Reading methods") {
+	const Color dark_blue = Color(0, 0, 0.5, 0.4);
+
+	CHECK_MESSAGE(
+			Math::is_equal_approx(dark_blue.get_h(), 240 / 360.0),
+			"The returned HSV hue should match the expected value.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(dark_blue.get_s(), 1),
+			"The returned HSV saturation should match the expected value.");
+	CHECK_MESSAGE(
+			Math::is_equal_approx(dark_blue.get_v(), 0.5),
+			"The returned HSV value should match the expected value.");
+}
+
+TEST_CASE("[Color] Conversion methods") {
+	const Color cyan = Color(0, 1, 1);
+	const Color cyan_transparent = Color(0, 1, 1, 0);
+
+	CHECK_MESSAGE(
+			cyan.to_html() == "ff00ffff",
+			"The returned RGB HTML color code should match the expected value.");
+	CHECK_MESSAGE(
+			cyan_transparent.to_html() == "0000ffff",
+			"The returned RGBA HTML color code should match the expected value.");
+	CHECK_MESSAGE(
+			cyan.to_argb32() == 0xff00ffff,
+			"The returned 32-bit RGB number should match the expected value.");
+	CHECK_MESSAGE(
+			cyan.to_abgr32() == 0xffffff00,
+			"The returned 32-bit BGR number should match the expected value.");
+	CHECK_MESSAGE(
+			cyan.to_rgba32() == 0x00ffffff,
+			"The returned 32-bit BGR number should match the expected value.");
+	CHECK_MESSAGE(
+			cyan.to_argb64() == 0xffff'0000'ffff'ffff,
+			"The returned 64-bit RGB number should match the expected value.");
+	CHECK_MESSAGE(
+			cyan.to_abgr64() == 0xffff'ffff'ffff'0000,
+			"The returned 64-bit BGR number should match the expected value.");
+	CHECK_MESSAGE(
+			cyan.to_rgba64() == 0x0000'ffff'ffff'ffff,
+			"The returned 64-bit BGR number should match the expected value.");
+	CHECK_MESSAGE(
+			String(cyan) == "0, 1, 1, 1",
+			"The string representation should match the expected value.");
+}
+
+TEST_CASE("[Color] Named colors") {
+	CHECK_MESSAGE(
+			Color::named("red").is_equal_approx(Color(1, 0, 0)),
+			"The named color \"red\" should match the expected value.");
+
+	// Named colors have their names automatically normalized.
+	CHECK_MESSAGE(
+			Color::named("white_smoke").is_equal_approx(Color(0.96, 0.96, 0.96)),
+			"The named color \"white_smoke\" should match the expected value.");
+	CHECK_MESSAGE(
+			Color::named("Slate Blue").is_equal_approx(Color(0.42, 0.35, 0.80)),
+			"The named color \"Slate Blue\" should match the expected value.");
+
+	ERR_PRINT_OFF;
+	CHECK_MESSAGE(
+			Color::named("doesn't exist").is_equal_approx(Color()),
+			"The invalid named color \"doesn't exist\" should result in a Color with the default values.");
+	ERR_PRINT_ON;
+}
+
+TEST_CASE("[Color] Validation methods") {
+	CHECK_MESSAGE(
+			Color::html_is_valid("#4080ff"),
+			"Valid HTML color (with leading #) should be considered valid.");
+	CHECK_MESSAGE(
+			Color::html_is_valid("4080ff"),
+			"Valid HTML color (without leading #) should be considered valid.");
+	CHECK_MESSAGE(
+			!Color::html_is_valid("12345"),
+			"Invalid HTML color should be considered invalid.");
+	CHECK_MESSAGE(
+			!Color::html_is_valid("#fuf"),
+			"Invalid HTML color should be considered invalid.");
+}
+
+TEST_CASE("[Color] Manipulation methods") {
+	const Color blue = Color(0, 0, 1, 0.4);
+
+	CHECK_MESSAGE(
+			blue.inverted().is_equal_approx(Color(1, 1, 0, 0.4)),
+			"Inverted color should have its red, green and blue components inverted.");
+	CHECK_MESSAGE(
+			blue.contrasted().is_equal_approx(Color(0.5, 0.5, 0.5, 0.4)),
+			"Contrasted pure blue should be fully gray.");
+
+	const Color purple = Color(0.5, 0.2, 0.5, 0.25);
+
+	CHECK_MESSAGE(
+			purple.lightened(0.2).is_equal_approx(Color(0.6, 0.36, 0.6, 0.25)),
+			"Color should be lightened by the expected amount.");
+	CHECK_MESSAGE(
+			purple.darkened(0.2).is_equal_approx(Color(0.4, 0.16, 0.4, 0.25)),
+			"Color should be darkened by the expected amount.");
+
+	const Color red = Color(1, 0, 0, 0.2);
+	const Color yellow = Color(1, 1, 0, 0.8);
+
+	CHECK_MESSAGE(
+			red.lerp(yellow, 0.5).is_equal_approx(Color(1, 0.5, 0, 0.5)),
+			"Red interpolated with yellow should be orange (with interpolated alpha).");
+}
+
+} // namespace TestColor
+
+#endif // TEST_COLOR_H
diff --git a/tests/test_main.cpp b/tests/test_main.cpp
index 0d83c3ced3..06a5482a3d 100644
--- a/tests/test_main.cpp
+++ b/tests/test_main.cpp
@@ -35,6 +35,7 @@
 #include "test_astar.h"
 #include "test_basis.h"
 #include "test_class_db.h"
+#include "test_color.h"
 #include "test_gdscript.h"
 #include "test_gui.h"
 #include "test_math.h"