Migrated tests to jest

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

test2/flattenObject/flattenObject.test.js

@@ -0,0 +1,10 @@
+const expect = require('expect');
+const flattenObject = require('./flattenObject.js');
+
+test('Testing flattenObject', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof flattenObject === 'function').toBeTruthy();
+  expect(flattenObject({ a: { b: { c: 1 } }, d: 1 })).toEqual({ 'a.b.c': 1, d: 1 });
+  expect(flattenObject([0,1,[2,[1]],1])).toEqual({ 0: 0, 1: 1, 3: 1, '2.0': 2, '2.1.0': 1 });
+});