Test migration to jest by hand

Apparently using regular expressions is way easier.

test/isUndefined/isUndefined.js

@@ -0,0 +1,2 @@
+const isUndefined = val => val === undefined;
+module.exports = isUndefined;

test/isUndefined/isUndefined.test.js

@@ -0,0 +1,12 @@
+const expect = require('expect');
+const isUndefined = require('./isUndefined.js');
+
+
+  test('isUndefined is a Function', () => {
+  expect(isUndefined).toBeInstanceOf(Function);
+});
+  test('Returns true for undefined', () => {
+  expect(isUndefined(undefined)).toBeTruthy();
+});
+  
+