Updated the test system

test/capitalizeEveryWord.test.js

@@ -0,0 +1,15 @@
+const expect = require('expect');
+const {capitalizeEveryWord} = require('./_30s.js');
+
+test('capitalizeEveryWord is a Function', () => {
+  expect(capitalizeEveryWord).toBeInstanceOf(Function);
+});
+test('Capitalizes the first letter of every word in a string', () => {
+  expect(capitalizeEveryWord('hello world!')).toBe('Hello World!');
+});
+test('Works with characters', () => {
+  expect(capitalizeEveryWord('$# @!')).toBe('$# @!');
+});
+test('Works with one word string', () => {
+  expect(capitalizeEveryWord('a')).toBe('A');
+});