Test migration to jest by hand

Apparently using regular expressions is way easier.

test/factors/factors.js

@@ -0,0 +1,20 @@
+const factors = (num, primes = false) => {
+const isPrime = num => {
+const boundary = Math.floor(Math.sqrt(num));
+for (var i = 2; i <= boundary; i++) if (num % i === 0) return false;
+return num >= 2;
+};
+const isNeg = num < 0;
+num = isNeg ? -num : num;
+let array = Array.from({ length: num - 1 })
+.map((val, i) => (num % (i + 2) === 0 ? i + 2 : false))
+.filter(val => val);
+if (isNeg)
+array = array.reduce((acc, val) => {
+acc.push(val);
+acc.push(-val);
+return acc;
+}, []);
+return primes ? array.filter(isPrime) : array;
+};
+module.exports = factors;

test/factors/factors.test.js

@@ -0,0 +1,8 @@
+const expect = require('expect');
+const factors = require('./factors.js');
+
+
+  test('factors is a Function', () => {
+  expect(factors).toBeInstanceOf(Function);
+});
+