Migrated tests to jest

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

test3/isLowerCase/isLowerCase.test.js

@@ -0,0 +1,11 @@
+const expect = require('expect');
+const isLowerCase = require('./isLowerCase.js');
+
+test('Testing isLowerCase', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof isLowerCase === 'function').toBeTruthy();
+  expect(isLowerCase('abc')).toBe(true);
+  expect(isLowerCase('a3@$')).toBe(true);
+  expect(isLowerCase('A3@$')).toBe(false);
+});