colourPair

import std.math : isClose;
with(colourPair(RGB888(0, 0, 0), RGB888(255, 255, 255))) {
	assert(contrast.isClose(21.0));
	assert(meetsWCAGAACriteria);
	assert(meetsWCAGAAACriteria);
}
with(colourPair(RGB888(255, 255, 255), RGB888(255, 255, 255))) {
	assert(contrast.isClose(1.0));
	assert(!meetsWCAGAACriteria);
	assert(!meetsWCAGAAACriteria);
}
with(colourPair(RGB888(0, 128, 255), RGB888(0, 0, 0))) {
	assert(contrast.isClose(5.5316685936));
	assert(meetsWCAGAACriteria);
	assert(!meetsWCAGAAACriteria);
}
with(colourPair(BGR555(0, 16, 31), RGB888(0, 0, 0))) {
	assert(contrast.isClose(5.7235463090));
	assert(meetsWCAGAACriteria);
	assert(!meetsWCAGAAACriteria);
}