| 1 | class TestUtils { |
| 2 | static async waitExits (pool, numberOfExitEventsToWait) { |
| 3 | let exitEvents = 0 |
| 4 | return new Promise(function (resolve, reject) { |
| 5 | pool.workers.forEach(w => { |
| 6 | w.on('exit', () => { |
| 7 | exitEvents++ |
| 8 | if (exitEvents === numberOfExitEventsToWait) { |
| 9 | resolve(exitEvents) |
| 10 | } |
| 11 | }) |
| 12 | }) |
| 13 | }) |
| 14 | } |
| 15 | |
| 16 | static async sleep (ms) { |
| 17 | return new Promise(resolve => setTimeout(resolve, ms)) |
| 18 | } |
| 19 | |
| 20 | static async workerSleepFunction ( |
| 21 | data, |
| 22 | ms, |
| 23 | rejection = false, |
| 24 | rejectionMessage = '' |
| 25 | ) { |
| 26 | return new Promise((resolve, reject) => { |
| 27 | setTimeout( |
| 28 | () => |
| 29 | rejection === true |
| 30 | ? reject(new Error(rejectionMessage)) |
| 31 | : resolve(data), |
| 32 | ms |
| 33 | ) |
| 34 | }) |
| 35 | } |
| 36 | |
| 37 | static jsonIntegerSerialization (n) { |
| 38 | for (let i = 0; i < n; i++) { |
| 39 | const o = { |
| 40 | a: i |
| 41 | } |
| 42 | JSON.stringify(o) |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * Intentionally inefficient implementation. |
| 48 | * |
| 49 | * @param {number} n |
| 50 | * @returns {number} |
| 51 | */ |
| 52 | static fibonacci (n) { |
| 53 | if (n <= 1) return 1 |
| 54 | return TestUtils.fibonacci(n - 1) + TestUtils.fibonacci(n - 2) |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Intentionally inefficient implementation. |
| 59 | * |
| 60 | * @param {number} n |
| 61 | * @returns {number} |
| 62 | */ |
| 63 | static factorial (n) { |
| 64 | if (n === 0) { |
| 65 | return 1 |
| 66 | } else { |
| 67 | return TestUtils.factorial(n - 1) * n |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | module.exports = TestUtils |