Migrated tests to jest

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

test4/lowercaseKeys/lowercaseKeys.test.js

@@ -0,0 +1,12 @@
+const expect = require('expect');
+const lowercaseKeys = require('./lowercaseKeys.js');
+
+test('Testing lowercaseKeys', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof lowercaseKeys === 'function').toBeTruthy();
+  const myObj = { Name: 'Adam', sUrnAME: 'Smith' };
+  const myObjLower = lowercaseKeys(myObj);
+  expect(myObjLower).toEqual({name: 'Adam', surname: 'Smith'});
+  expect(myObj).toEqual({ Name: 'Adam', sUrnAME: 'Smith' });
+});