SolalDR/data-gui

const assert = require('assert');
const howLongTillLunch = require('..');

function MockDate () {
    this.date = 0;
    this.hours = 0;
    this.minutes = 0;
    this.seconds = 0;
    this.milliseconds = 0;
};

Object.assign(MockDate.prototype, {
    getDate () { return this.date; },
    setDate (date) { this.date = date; },
    setHours (h) { this.hours = h; },
    setMinutes (m) { this.minutes = m; },
    setSeconds (s) { this.seconds = s; },
    setMilliseconds (ms) { this.milliseconds = ms; },
    valueOf () {
        return (
            this.milliseconds +
            this.seconds * 1e3 +
            this.minutes * 1e3 * 60 +
            this.hours * 1e3 * 60 * 60 +
            this.date * 1e3 * 60 * 60 * 24
        );
    }
});

const now = new MockDate();
MockDate.now = () => now.valueOf();

global.Date = MockDate;

function test(hours, minutes, seconds, expected) {
    now.setHours(hours);
    now.setMinutes(minutes);
    now.setSeconds(seconds);

    assert.equal(howLongTillLunch(...lunchtime), expected);
    console.log(`\u001B[32m✓\u001B[39m ${expected}`);
}

let lunchtime = [ 12, 30 ];
test(11, 30, 0, '1 hour');
test(10, 30, 0, '2 hours');
test(12, 25, 0, '5 minutes');
test(12, 29, 15, '45 seconds');
test(13, 30, 0, '23 hours');

// some of us like an early lunch
lunchtime = [ 11, 0 ];
test(10, 30, 0, '30 minutes');