Updated the test system

test/over.test.js

@@ -0,0 +1,10 @@
+const expect = require('expect');
+const {over} = require('./_30s.js');
+
+test('over is a Function', () => {
+  expect(over).toBeInstanceOf(Function);
+});
+const minMax = over(Math.min, Math.max);
+test('Applies given functions over multiple arguments', () => {
+  expect(minMax(1, 2, 3, 4, 5)).toEqual([1, 5]);
+});