tests/test-utils.js

   1 class TestUtils {
   2   static async waitExits (pool, numberOfExitEventsToWait) {
   3     let exitEvents = 0
   4     return new Promise(resolve => {
   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 - The number of fibonacci numbers to generate.
  50    * @returns {number} - The nth fibonacci 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 - The number to calculate the factorial of.
  61    * @returns {number} - The factorial of n.
  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