Updated the test system

test/escapeRegExp.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const {escapeRegExp} = require('./_30s.js');
+
+test('escapeRegExp is a Function', () => {
+  expect(escapeRegExp).toBeInstanceOf(Function);
+});
+test('Escapes a string to use in a regular expression', () => {
+  expect(escapeRegExp('(test)')).toBe('\\(test\\)');
+});