Updated the test system

test/compact.test.js

@@ -0,0 +1,16 @@
+const expect = require('expect');
+const {compact} = require('./_30s.js');
+
+test('compact is a Function', () => {
+  expect(compact).toBeInstanceOf(Function);
+});
+test('Removes falsey values from an array', () => {
+  expect(compact([0, 1, false, 2, '', 3, 'a', 'e' * 23, NaN, 's', 34])).toEqual([
+    1,
+    2,
+    3,
+    'a',
+    's',
+    34
+  ]);
+});