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stub timer to fix flaky test

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This commit is contained in:
Eric Rosenbaum 2019-03-26 11:56:50 -04:00
parent 2f62773984
commit d49c7b732c
1 changed files with 21 additions and 13 deletions
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34
test/unit/util_timer.js
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@ -1,8 +1,18 @@
const test = require('tap').test;
const Timer = require('../../src/util/timer');
// Stubbed current time
let NOW = 0;
const testNow = {
now: () => {
NOW += 100;
return NOW;
}
};
test('spec', t => {
const timer = new Timer();
const timer = new Timer(testNow);
t.type(Timer, 'function');
t.type(timer, 'object');
@ -18,33 +28,31 @@ test('spec', t => {
});
test('time', t => {
const timer = new Timer();
const timer = new Timer(testNow);
const time = timer.time();
t.ok(Date.now() >= time);
t.ok(testNow.now() >= time);
t.end();
});
test('start / timeElapsed', t => {
const timer = new Timer();
const timer = new Timer(testNow);
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);
// Measure timer
const timeElapsed = timer.timeElapsed();
t.ok(timeElapsed >= 0);
t.ok(timeElapsed >= (delay - threshold) &&
timeElapsed <= (delay + threshold));
t.end();
});
test('setTimeout / clearTimeout', t => new Promise((resolve, reject) => {
const timer = new Timer();
const timer = new Timer(testNow);
const cancelId = timer.setTimeout(() => {
reject(new Error('Canceled task ran'));
}, 1);