Test migration to jest by hand

Apparently using regular expressions is way easier.

test/gcd/gcd.test.js

@@ -0,0 +1,10 @@
+const expect = require('expect');
+const gcd = require('./gcd.js');
+
+
+  test('gcd is a Function', () => {
+  expect(gcd).toBeInstanceOf(Function);
+});
+  t.equal(gcd(8, 36), 4, "Calculates the greatest common divisor between two or more numbers/arrays");
+  t.deepEqual(gcd(...[12, 8, 32]), 4, "Calculates the greatest common divisor between two or more numbers/arrays");
+