Updated the test system

test/any.test.js

@@ -0,0 +1,21 @@
+const expect = require('expect');
+const {any} = require('./_30s.js');
+
+test('any is a Function', () => {
+  expect(any).toBeInstanceOf(Function);
+});
+test('Returns true for arrays with at least one truthy value', () => {
+  expect(any([0, 1, 2, 3])).toBeTruthy();
+});
+test('Returns false for arrays with no truthy values', () => {
+  expect(any([0, 0])).toBeFalsy();
+});
+test('Returns false for arrays with no truthy values', () => {
+  expect(any([NaN, 0, undefined, null, ''])).toBeFalsy();
+});
+test('Returns true with predicate function', () => {
+  expect(any([4, 1, 0, 3], x => x >= 1)).toBeTruthy();
+});
+test('Returns false with a predicate function', () => {
+  expect(any([0, 1], x => x < 0)).toBeFalsy();
+});