chroma-js/test/rgb2hsi.test.js

JavaScript library for color conversions

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

const rgb2hsi = require('../src/io/hsi/rgb2hsi');

const tests = {
    black2:     { hsi: [NaN,0,0],   rgb: [0,0,0,1]},
    white:      { hsi: [NaN,0,1],   rgb: [255,255,255,1]},
    gray:       { hsi: [NaN,0,0.5],   rgb: [127.5,127.5,127.5,1]},
    red:        { hsi: [0,1,1/3],   rgb: [255,0,0,1]},
    yellow:     { hsi: [60,1,2/3],  rgb: [255,255,0,1]},
    green:      { hsi: [120,1,1/3], rgb: [0,255,0,1]},
    cyan:       { hsi: [180,1,2/3], rgb: [0,255,255,1]},
    blue:       { hsi: [240,1,1/3], rgb: [0,0,255,1]},
    magenta:    { hsi: [300,1,2/3], rgb: [255,0,255,1]},
};

const round = (digits) => {
    const d = Math.pow(10,digits);
    return (v) => Math.round(v*d) / d;
}
const rnd = round(5);

const batch = {};

Object.keys(tests).forEach(key => {
    batch[`rgb2hsi ${key}`] = {
        topic: tests[key],
        array(topic) {
            assert.deepStrictEqual(rgb2hsi(topic.rgb).map(rnd), topic.hsi.map(rnd));
        },
        obj(topic) {
            let [r,g,b] = topic.rgb;
            assert.deepStrictEqual(rgb2hsi({r,g,b}).map(rnd), topic.hsi.map(rnd));
        },
        args(topic) {
            if (topic.mode != 'auto') return
            assert.deepStrictEqual(rgb2hsi.apply(null, topic.rgb).map(rnd), topic.hsi.map(rnd));
        }
    }
});

vows
    .describe('Test rgb2hsi color conversions')
    .addBatch(batch)
    .export(module);