astro/packages/integrations/mdx/test/mdx-frontmatter.js

import mdx from '@astrojs/mdx';

import { expect } from 'chai';
import { loadFixture } from '../../../astro/test/test-utils.js';

const FIXTURE_ROOT = new URL('./fixtures/mdx-frontmatter/', import.meta.url);

describe('MDX frontmatter', () => {
	it('builds when "frontmatter.property" is in JSX expression', async () => {
		const fixture = await loadFixture({
			root: FIXTURE_ROOT,
			integrations: [mdx()],
		});
		await fixture.build();
		expect(true).to.equal(true);
	});

	it('extracts frontmatter to "frontmatter" export', async () => {
		const fixture = await loadFixture({
			root: FIXTURE_ROOT,
			integrations: [mdx()],
		});
		await fixture.build();

		const { titles } = JSON.parse(await fixture.readFile('/glob.json'));
		expect(titles).to.include('Using YAML frontmatter');
	});

	it('extracts frontmatter to "customFrontmatter" export when configured', async () => {
		const fixture = await loadFixture({
			root: new URL('./fixtures/mdx-custom-frontmatter-name/', import.meta.url),
			integrations: [mdx({
				frontmatterOptions: {
					name: 'customFrontmatter',
				},
			})],
		});
		await fixture.build();

		const { titles } = JSON.parse(await fixture.readFile('/glob.json'));
		expect(titles).to.include('Using YAML frontmatter');
	});
});