Updated the test system

test/untildify.test.js

@@ -0,0 +1,15 @@
+const expect = require('expect');
+const {untildify} = require('./_30s.js');
+
+test('untildify is a Function', () => {
+  expect(untildify).toBeInstanceOf(Function);
+});
+test('Contains no tildes', () => {
+  expect(untildify('~/test/dir/file.f').indexOf('~') === -1).toBeTruthy();
+});
+test('Does not alter the rest of the path', () => {
+  expect(untildify('~/test/dir/file.f').slice(-16)).toBe('/test/dir/file.f');
+});
+test('Does not alter paths without tildes', () => {
+  expect(untildify('test/dir/file.f')).toBe('test/dir/file.f');
+});