Test migration to jest by hand

Apparently using regular expressions is way easier.

test/hasClass/hasClass.js

@@ -0,0 +1,2 @@
+const hasClass = (el, className) => el.classList.contains(className);
+module.exports = hasClass;

test/hasClass/hasClass.test.js

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