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Nick: added html-transformer unit tests
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Nicolas
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319
apps/api/src/lib/__tests__/html-transformer.test.ts
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319
apps/api/src/lib/__tests__/html-transformer.test.ts
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import {
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extractLinks,
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extractMetadata,
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transformHtml,
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} from "../html-transformer";
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describe("HTML Transformer", () => {
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describe("extractLinks", () => {
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it("should return empty array for null or undefined input", async () => {
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expect(await extractLinks(null)).toEqual([]);
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expect(await extractLinks(undefined)).toEqual([]);
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});
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it("should extract links from HTML content", async () => {
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const html = `
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<html>
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<body>
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<a href="https://example.com">Example</a>
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<a href="https://test.com">Test</a>
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</body>
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</html>
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`;
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const links = await extractLinks(html);
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expect(links).toContain("https://example.com");
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expect(links).toContain("https://test.com");
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});
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it("should handle relative links", async () => {
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const html = `
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<html>
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<body>
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<a href="/path/to/page">Relative</a>
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<a href="../another/page">Parent Path</a>
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<a href="./local/page">Local Path</a>
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<a href="relative/path">Implicit Relative</a>
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<a href="?param=value">Query Param</a>
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<a href="#section">Hash Link</a>
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</body>
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</html>
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`;
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const links = await extractLinks(html);
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expect(links).toEqual([
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"/path/to/page",
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"../another/page",
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"./local/page",
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"relative/path",
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"?param=value",
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"#section",
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]);
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});
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it("should handle complex nested HTML structure", async () => {
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const html = `
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<html>
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<body>
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<div class="container">
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<nav>
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<ul>
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<li><a href="https://nav1.com">Nav 1</a></li>
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<li><a href="https://nav2.com">Nav 2</a></li>
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</ul>
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</nav>
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<main>
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<article>
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<p>Some text with a <a href="https://inline.com">link</a></p>
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<div class="nested">
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<a href="https://nested.com">Nested Link</a>
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</div>
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</article>
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</main>
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</div>
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</body>
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</html>
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`;
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const links = await extractLinks(html);
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expect(links).toContain("https://nav1.com");
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expect(links).toContain("https://nav2.com");
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expect(links).toContain("https://inline.com");
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expect(links).toContain("https://nested.com");
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});
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it("should handle malformed HTML gracefully", async () => {
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const html = `
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<div>
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<a href="https://valid.com">Valid</a>
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<a href="invalid">Invalid</a>
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<a>No href</a>
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<a href="">Empty href</a>
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<a href="javascript:void(0)">JavaScript href</a>
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<a href="mailto:test@example.com">Email link</a>
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</div>
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`;
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const links = await extractLinks(html);
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expect(links).toContain("https://valid.com");
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// Other links should be filtered out or handled appropriately
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});
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});
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describe("extractMetadata", () => {
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it("should return empty array for null or undefined input", async () => {
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expect(await extractMetadata(null)).toEqual([]);
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expect(await extractMetadata(undefined)).toEqual([]);
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});
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it("should extract comprehensive metadata from HTML content", async () => {
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const html = `
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<html>
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<head>
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<title>Test Page Title</title>
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<meta name="description" content="Detailed page description">
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<meta name="keywords" content="test,page,keywords">
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<meta name="author" content="Test Author">
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<meta property="og:title" content="OpenGraph Title">
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<meta property="og:description" content="OpenGraph Description">
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<meta property="og:image" content="https://example.com/image.jpg">
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<meta name="twitter:card" content="summary">
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<meta name="twitter:title" content="Twitter Title">
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<link rel="canonical" href="https://example.com/canonical">
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</head>
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<body></body>
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</html>
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`;
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const metadata = await extractMetadata(html);
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expect(metadata).toMatchObject({
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"twitter:title": "Twitter Title",
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ogImage: "https://example.com/image.jpg",
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"og:image": "https://example.com/image.jpg",
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ogDescription: "OpenGraph Description",
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"twitter:card": "summary",
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title: "Test Page Title",
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ogTitle: "OpenGraph Title",
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author: "Test Author",
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keywords: "test,page,keywords",
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"og:title": "OpenGraph Title",
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"og:description": "OpenGraph Description",
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description: "Detailed page description",
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});
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});
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it("should handle metadata with special characters and encoding", async () => {
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const html = `
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<html>
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<head>
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<title>Test & Page with ©️ symbols</title>
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<meta name="description" content="Description with "quotes" and émojis 🎉">
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<meta property="og:title" content="Title with < and > symbols">
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</head>
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<body></body>
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</html>
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`;
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const metadata = await extractMetadata(html);
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expect(metadata.title).toContain("&");
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expect(metadata.description).toContain("quotes");
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});
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it("should handle missing or malformed metadata gracefully", async () => {
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const html = `
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<html>
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<head>
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<meta name="description" content="">
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<meta property="og:title">
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<meta name="keywords" content=" ">
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</head>
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<body></body>
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</html>
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`;
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const metadata = await extractMetadata(html);
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expect(metadata).toBeDefined();
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});
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});
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describe("transformHtml", () => {
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it("should transform HTML content according to options", async () => {
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const options = {
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html: "<div><p>Test</p><span>Remove me</span></div>",
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url: "https://example.com",
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include_tags: ["p"],
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exclude_tags: ["span"],
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only_main_content: true,
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};
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const result = await transformHtml(options);
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expect(result).toContain("<p>");
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expect(result).not.toContain("<span>");
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});
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it("should handle complex content filtering", async () => {
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const options = {
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html: `
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<div class="wrapper">
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<header>
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<nav>Navigation</nav>
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</header>
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<main>
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<article>
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<h1>Title</h1>
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<p>Important content</p>
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<div class="ads">Advertisement</div>
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<aside>Sidebar</aside>
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<div class="social-share">Share buttons</div>
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</article>
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</main>
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<footer>Footer content</footer>
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</div>
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`,
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url: "https://example.com",
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include_tags: ["article", "h1", "p"],
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exclude_tags: ["nav", "aside", "footer", ".ads", ".social-share"],
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only_main_content: true,
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};
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const result = await transformHtml(options);
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expect(result).toContain("<h1>Title</h1>");
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expect(result).toContain("<p>Important content</p>");
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expect(result).not.toContain("Navigation");
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expect(result).not.toContain("Advertisement");
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expect(result).not.toContain("Share buttons");
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expect(result).not.toContain("Footer content");
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});
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it("should handle nested content preservation and absolute links", async () => {
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const options = {
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html: `
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<article>
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<div class="content">
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<h2>Section</h2>
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<p>Text with <strong>bold</strong> and <em>emphasis</em></p>
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<ul>
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<li>Item 1</li>
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<li>Item 2 <a href="#">with link</a></li>
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</ul>
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</div>
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</article>
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`,
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url: "https://example.com",
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include_tags: ["article", "p", "ul", "li"],
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exclude_tags: [],
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only_main_content: true,
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};
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const result = await transformHtml(options);
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expect(result).toContain("<strong>bold</strong>");
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expect(result).toContain("<em>emphasis</em>");
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expect(result).toContain('<a href="https://example.com/#">');
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});
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it("should handle empty HTML content", async () => {
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const options = {
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html: "",
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url: "https://example.com",
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include_tags: [],
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exclude_tags: [],
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only_main_content: false,
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};
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const result = await transformHtml(options);
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expect(result).toBe("<html><body></body></html>");
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});
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it("should handle malformed HTML", async () => {
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const options = {
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html: "<div>Unclosed div",
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url: "https://example.com",
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include_tags: [],
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exclude_tags: [],
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only_main_content: false,
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};
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const result = await transformHtml(options);
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expect(result).toBe("<html><body><div>Unclosed div</div></body></html>");
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});
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it("should handle HTML with comments and scripts", async () => {
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const options = {
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html: `
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<div>
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<!-- Comment -->
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<script>alert('test');</script>
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<p>Real content</p>
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<style>.test { color: red; }</style>
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<noscript>Enable JavaScript</noscript>
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</div>
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`,
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url: "https://example.com",
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include_tags: ["p"],
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exclude_tags: ["script", "style", "noscript"],
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only_main_content: true,
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};
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const result = await transformHtml(options);
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expect(result).toContain("<p>Real content</p>");
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expect(result).not.toContain("alert");
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expect(result).not.toContain("color: red");
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expect(result).not.toContain("Enable JavaScript");
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});
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it("should handle special characters and encoding", async () => {
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const options = {
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html: `
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<div>
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<p>© 2024</p>
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<p><tag></p>
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<p>Special chars: á é í ó ú ñ</p>
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<p>Emojis: 🎉 👍 🚀</p>
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</div>
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`,
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url: "https://example.com",
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include_tags: ["p"],
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exclude_tags: [],
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only_main_content: true,
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};
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const result = await transformHtml(options);
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expect(result).toContain("©");
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expect(result).toContain("á é í ó ú ñ");
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expect(result).toContain("🎉 👍 🚀");
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});
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});
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});
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