1 files changed, 79 insertions, 0 deletions
diff --git a/packages/integrations/mdx/test/mdx-frontmatter.test.js b/packages/integrations/mdx/test/mdx-frontmatter.test.js
new file mode 100644
index 000000000..df36a2439
--- /dev/null
+++ b/packages/integrations/mdx/test/mdx-frontmatter.test.js
@@ -0,0 +1,79 @@
+import mdx from '@astrojs/mdx';
+
+import * as assert from 'node:assert/strict';
+import { before, describe, it } from 'node:test';
+import { parseHTML } from 'linkedom';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+
+const FIXTURE_ROOT = new URL('./fixtures/mdx-frontmatter/', import.meta.url);
+
+describe('MDX frontmatter', () => {
+	let fixture;
+	before(async () => {
+		fixture = await loadFixture({
+			root: FIXTURE_ROOT,
+			integrations: [mdx()],
+		});
+		await fixture.build();
+	});
+	it('builds when "frontmatter.property" is in JSX expression', async () => {
+		assert.equal(true, true);
+	});
+
+	it('extracts frontmatter to "frontmatter" export', async () => {
+		const { titles } = JSON.parse(await fixture.readFile('/glob.json'));
+		assert.equal(titles.includes('Using YAML frontmatter'), true);
+	});
+
+	it('renders layout from "layout" frontmatter property', async () => {
+		const html = await fixture.readFile('/index.html');
+		const { document } = parseHTML(html);
+
+		const layoutParagraph = document.querySelector('[data-layout-rendered]');
+
+		assert.notEqual(layoutParagraph, null);
+	});
+
+	it('passes frontmatter to layout via "content" and "frontmatter" props', async () => {
+		const html = await fixture.readFile('/index.html');
+		const { document } = parseHTML(html);
+
+		const contentTitle = document.querySelector('[data-content-title]');
+		const frontmatterTitle = document.querySelector('[data-frontmatter-title]');
+
+		assert.equal(contentTitle.textContent, 'Using YAML frontmatter');
+		assert.equal(frontmatterTitle.textContent, 'Using YAML frontmatter');
+	});
+
+	it('passes headings to layout via "headings" prop', async () => {
+		const html = await fixture.readFile('/with-headings/index.html');
+		const { document } = parseHTML(html);
+
+		const headingSlugs = [...document.querySelectorAll('[data-headings] > li')].map(
+			(el) => el.textContent,
+		);
+
+		assert.equal(headingSlugs.length > 0, true);
+		assert.equal(headingSlugs.includes('section-1'), true);
+		assert.equal(headingSlugs.includes('section-2'), true);
+	});
+
+	it('passes "file" and "url" to layout', async () => {
+		const html = await fixture.readFile('/with-headings/index.html');
+		const { document } = parseHTML(html);
+
+		const frontmatterFile = document.querySelector('[data-frontmatter-file]')?.textContent;
+		const frontmatterUrl = document.querySelector('[data-frontmatter-url]')?.textContent;
+		const file = document.querySelector('[data-file]')?.textContent;
+		const url = document.querySelector('[data-url]')?.textContent;
+
+		assert.equal(
+			frontmatterFile?.endsWith('with-headings.mdx'),
+			true,
+			'"file" prop does not end with correct path or is undefined',
+		);
+		assert.equal(frontmatterUrl, '/with-headings');
+		assert.equal(file, frontmatterFile);
+		assert.equal(url, frontmatterUrl);
+	});
+});