Test migration to jest by hand

Apparently using regular expressions is way easier.

test/isPrime/isPrime.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const isPrime = require('./isPrime.js');
+
+
+  test('isPrime is a Function', () => {
+  expect(isPrime).toBeInstanceOf(Function);
+});
+  t.equal(isPrime(11), true, "passed number is a prime");
+