TypeScript isFibonacci function unit testing using Jest

index.test.js

import isFibonacci from "./index"

var fibSeries: number[] = [0,1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181]

test('Test fibonnaci series from 0 to 4181', () => {
    for (var i = 0; i < fibSeries.length; i++) {
        expect(isFibonacci(fibSeries[i])).toBe(true)
    }
})

Output:

> jest

 PASS  src/index.spec.ts
  √ Test fibonnaci series from 1 to 100 (5ms)

  console.log src/index.ts:11
    false

  console.log src/index.ts:12
    true

  console.log src/index.ts:13
    true

  console.log src/index.ts:14
    false

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        1.887s
Ran all test suites.