Test migration to jest by hand

Apparently using regular expressions is way easier.

test/primes/primes.js

@@ -0,0 +1,8 @@
+const primes = num => {
+let arr = Array.from({ length: num - 1 }).map((x, i) => i + 2),
+sqroot = Math.floor(Math.sqrt(num)),
+numsTillSqroot = Array.from({ length: sqroot - 1 }).map((x, i) => i + 2);
+numsTillSqroot.forEach(x => (arr = arr.filter(y => y % x !== 0 || y === x)));
+return arr;
+};
+module.exports = primes;

test/primes/primes.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const primes = require('./primes.js');
+
+
+  test('primes is a Function', () => {
+  expect(primes).toBeInstanceOf(Function);
+});
+  t.deepEqual(primes(10), [2, 3, 5, 7], "Generates primes up to a given number, using the Sieve of Eratosthenes.");
+