chroma-js/test/rgb2lch.test.js

JavaScript library for color conversions

const vows = require('vows')
const assert = require('assert');
require('es6-shim');

const rgb2lch = require('../src/io/lch/rgb2lch');

const tests = {
    black:      { lch: [0,0,NaN],             rgb: [0,0,0] },
    white:      { lch: [100,0,NaN],           rgb: [255,255,255] },
    gray:       { lch: [53.59,0,NaN],         rgb: [128,128,128] },
    red:        { lch: [53.24,104.55,40],     rgb: [255,0,0] },
    yellow:     { lch: [97.14,96.91,102.85],  rgb: [255,255,0] },
    green:      { lch: [87.73,119.78,136.02], rgb: [0,255,0] },
    cyan:       { lch: [91.11,50.12,196.38],  rgb: [0,255,255] },
    blue:       { lch: [32.3,133.81,306.28],  rgb: [0,0,255] },
    magenta:    { lch: [60.32,115.54,328.23], rgb: [255,0,255] },
};

const round = (digits) => {
    const d = Math.pow(10,digits);
    return (v) => {
        if (v > -1e-3 && v < 1e-3) v = 0;
        return Math.round(v*d) / d;
    }
}
const rnd = round(2);

const batch = {};

Object.keys(tests).forEach(key => {
    batch[`rgb2lch ${key}`] = {
        topic: tests[key],
        array(topic) {
            assert.deepStrictEqual(rgb2lch(topic.rgb).map(rnd), topic.lch);
        },
        obj(topic) {
            let [r,g,b] = topic.rgb;
            assert.deepStrictEqual(rgb2lch({r,g,b}).map(rnd), topic.lch);
        },
        args(topic) {
            assert.deepStrictEqual(rgb2lch.apply(null, topic.rgb).map(rnd), topic.lch);
        }
    }
});

vows
    .describe('Test rgb2lch color conversions')
    .addBatch(batch)
    .export(module);