Updated the test system

test/partition.test.js

@@ -0,0 +1,13 @@
+const expect = require('expect');
+const {partition} = require('./_30s.js');
+
+test('partition is a Function', () => {
+  expect(partition).toBeInstanceOf(Function);
+});
+const users = [{ user: 'barney', age: 36, active: false }, { user: 'fred', age: 40, active: true }];
+test("Groups the elements into two arrays, depending on the provided function's truthiness for each element.", () => {
+  expect(partition(users, o => o.active)).toEqual([
+    [{ user: 'fred', age: 40, active: true }],
+    [{ user: 'barney', age: 36, active: false }]
+  ]);
+});