Updated the test system

test/removeNonASCII.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const {removeNonASCII} = require('./_30s.js');
+
+test('removeNonASCII is a Function', () => {
+  expect(removeNonASCII).toBeInstanceOf(Function);
+});
+test('Removes non-ASCII characters', () => {
+  expect(removeNonASCII('äÄçÇéÉêlorem-ipsumöÖÐþúÚ')).toBe('lorem-ipsum');
+});