scratch-vm/test/unit/util_timer.js
2019-02-07 16:35:32 -08:00

42 lines
948 B
JavaScript

const test = require('tap').test;
const Timer = require('../../src/util/timer');
test('spec', t => {
const timer = new Timer();
t.type(Timer, 'function');
t.type(timer, 'object');
t.type(timer.startTime, 'number');
t.type(timer.time, 'function');
t.type(timer.start, 'function');
t.type(timer.timeElapsed, 'function');
t.end();
});
test('time', t => {
const timer = new Timer();
const time = timer.time();
t.ok(Date.now() >= time);
t.end();
});
test('start / timeElapsed', t => {
const timer = new Timer();
const delay = 100;
const threshold = 1000 / 60; // 60 hz
// Start timer
timer.start();
// Wait and measure timer
timer.setTimeout(() => {
const timeElapsed = timer.timeElapsed();
t.ok(timeElapsed >= 0);
t.ok(timeElapsed >= (delay - threshold) &&
timeElapsed <= (delay + threshold));
t.end();
}, delay);
});