Updated the test system

test/union.test.js

@@ -0,0 +1,54 @@
+const expect = require('expect');
+const {union} = require('./_30s.js');
+
+test('union is a Function', () => {
+  expect(union).toBeInstanceOf(Function);
+});
+test('union([1, 2, 3], [4, 3, 2]) returns [1, 2, 3, 4]', () => {
+  expect(union([1, 2, 3], [4, 3, 2])).toEqual([1, 2, 3, 4]);
+});
+test("union('str', 'asd') returns [ 's', 't', 'r', 'a', 'd' ]", () => {
+  expect(union('str', 'asd')).toEqual(['s', 't', 'r', 'a', 'd']);
+});
+test('union([[], {}], [1, 2, 3]) returns [[], {}, 1, 2, 3]', () => {
+  expect(union([[], {}], [1, 2, 3])).toEqual([[], {}, 1, 2, 3]);
+});
+test('union([], []) returns []', () => {
+  expect(union([], [])).toEqual([]);
+});
+test('union() throws an error', () => {
+  expect(() => {
+    union();
+  }).toThrow();
+});
+test("union(true, 'str') throws an error", () => {
+  expect(() => {
+    union(true, 'str');
+  }).toThrow();
+});
+test("union('false', true) throws an error", () => {
+  expect(() => {
+    union('false', true);
+  }).toThrow();
+});
+test('union((123, {}) throws an error', () => {
+  expect(() => {
+    union(123, {});
+  }).toThrow();
+});
+test('union([], {}) throws an error', () => {
+  expect(() => {
+    union([], {});
+  }).toThrow();
+});
+test('union(undefined, null) throws an error', () => {
+  expect(() => {
+    union(undefined, null);
+  }).toThrow();
+});
+let start = new Date().getTime();
+union([1, 2, 3], [4, 3, 2]);
+let end = new Date().getTime();
+test('union([1, 2, 3], [4, 3, 2]) takes less than 2s to run', () => {
+  expect(end - start < 2000).toBeTruthy();
+});