imporve: test for validLink

lib/url/validLink.ts

@@ -6,6 +6,7 @@ export default function validLink(link: string) {
     try {
         const url = new URL(link);
         finalURL = url.origin;
+        return true;
     } catch (error) {
         // if the URL is invalid, try to add the protocol
         try {
@@ -22,7 +23,7 @@ export default function validLink(link: string) {
     }
 }
 
-function validTLD(domain: string): boolean {
+export function validTLD(domain: string): boolean {
     const tld = punycode.toUnicode(domain.split(".").reverse()[0]);
     if (tldList.includes(tld)) {
         return true;

test/validLink.test.ts

@@ -1,6 +1,64 @@
-import {describe, expect, test} from '@jest/globals';
-import validLink from "../lib/url/validLink";
+import { describe, expect, test } from "@jest/globals";
+import validLink, { validTLD } from "../lib/url/validLink";
 
+describe("Check if a string is an accessible domain/URL", () => {
     test("Plain, full URL", () => {
-    expect(validLink("https://example.com/about-us")).toBe(true);
+        // Plain form
+        expect(validLink("http://example.com")).toBe(true);
+        // With https and path
+        expect(validLink("https://jestjs.io/docs/getting-started/")).toBe(true);
+        // With anchor
+        expect(validLink("https://difftastic.wilfred.me.uk/zh-CN/git.html#git-difftool")).toBe(true);
+        // With params
+        expect(validLink("https://www.bilibili.com/list/ml2252204359?oid=990610203&bvid=BV1sx4y1g7Hh")).toBe(true);
+    });
+    test("Punycode URL", () => {
+        expect(validLink("https://原神大学.com/")).toBe(true);
+        expect(validLink("中国原神大学.com")).toBe(true);
+    });
+    test("Invalid TLD with protocol", () => {
+        expect(validLink("https://www.example.notexist")).toBe(true);
+    });
+    test("Invalid TLD with no protocol", () => {
+        expect(validLink("www.example.notexist")).toBe(false);
+    });
+});
+
+// Reference: https://www.iana.org/domains/root/db
+describe("Check if the given TLD exist and assigned.", () => {
+    test("Valid normal TLD", () => {
+        expect(validTLD("com")).toBe(true);
+        expect(validTLD("top")).toBe(true);
+        expect(validTLD("net")).toBe(true);
+        expect(validTLD("org")).toBe(true);
+    });
+    test("Valid new TLDs", () => {
+        // they really exist!
+        expect(validTLD("foo")).toBe(true);
+        expect(validTLD("bar")).toBe(true);
+    });
+    test("Exist but not assigned TLD", () => {
+        expect(validTLD("active")).toBe(false);
+        expect(validTLD("off")).toBe(false);
+    });
+    test("with dot", () => {
+        expect(validTLD(".com")).toBe(true);
+        expect(validTLD(".us")).toBe(true);
+        expect(validTLD(".cn")).toBe(true);
+        expect(validTLD(".io")).toBe(true);
+    });
+    test("Punycode TLDs", () => {
+        expect(validTLD(".中国")).toBe(true);
+        expect(validTLD(".РФ")).toBe(true);
+        expect(validTLD(".कॉम")).toBe(true);
+        expect(validTLD("ایران")).toBe(true);
+        expect(validTLD("இலங்கை")).toBe(true);
+        expect(validTLD("გე")).toBe(true);
+        expect(validTLD("ポイント")).toBe(true);
+    });
+    test("Punycode TLDs but not assigned", () => {
+        expect(validTLD("テスト")).toBe(false);
+        expect(validTLD("परीक्षा")).toBe(false);
+        expect(validTLD("测试")).toBe(false);
+    });
 });