Test migration to jest by hand

Apparently using regular expressions is way easier.

test/isEven/isEven.test.js

@@ -0,0 +1,12 @@
+const expect = require('expect');
+const isEven = require('./isEven.js');
+
+
+  test('isEven is a Function', () => {
+  expect(isEven).toBeInstanceOf(Function);
+});
+  t.equal(isEven(4), true, '4 is even number');
+  test('5 is not an even number', () => {
+  expect(isEven(5), false).toBeFalsy();
+});
+