Migrated tests to jest

Used jest-codemods to migrate, will have to pass everything by hand before we can merge.

test2/digitize/digitize.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const digitize = require('./digitize.js');
+
+test('Testing digitize', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof digitize === 'function').toBeTruthy();
+  expect(digitize(123)).toEqual([1, 2, 3]);
+});