Add test suite for using slots in MDX

Includes testing use of `<Fragment slot="...">`

packages/integrations/mdx/test/fixtures/mdx-slots/src/components/Slotted.astro

@@ -0,0 +1,4 @@
+<div class="slotted">
+	<div data-default-slot><slot /></div>
+	<div data-named-slot><slot name="named" /></div>
+</div>

packages/integrations/mdx/test/fixtures/mdx-slots/src/components/Test.mdx

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+import Slotted from './Slotted.astro'
+
+# Hello slotted component!
+
+<Slotted>
+
+Default content.
+
+<Fragment slot="named">
+
+Content for named slot.
+
+</Fragment>
+
+</Slotted>

packages/integrations/mdx/test/fixtures/mdx-slots/src/pages/glob.astro

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+---
+const components = await Astro.glob('../components/*.mdx');
+---
+
+<div data-default-export>
+	{components.map(Component => <Component.default />)}
+</div>
+
+<div data-content-export>
+	{components.map(({ Content }) => <Content />)}
+</div>

packages/integrations/mdx/test/fixtures/mdx-slots/src/pages/index.astro

@@ -0,0 +1,5 @@
+---
+import Test from '../components/Test.mdx';
+---
+
+<Test />

packages/integrations/mdx/test/mdx-slots.js

@@ -0,0 +1,124 @@
+import mdx from '@astrojs/mdx';
+
+import { expect } from 'chai';
+import { parseHTML } from 'linkedom';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+
+describe('MDX slots', () => {
+	let fixture;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: new URL('./fixtures/mdx-slots/', import.meta.url),
+			integrations: [mdx()],
+		});
+	});
+
+	describe('build', () => {
+		before(async () => {
+			await fixture.build();
+		});
+
+		it('supports top-level imports', async () => {
+			const html = await fixture.readFile('/index.html');
+			const { document } = parseHTML(html);
+
+			const h1 = document.querySelector('h1');
+			const defaultSlot = document.querySelector('[data-default-slot]');
+			const namedSlot = document.querySelector('[data-named-slot]');
+
+			expect(h1.textContent).to.equal('Hello slotted component!');
+			expect(defaultSlot.textContent).to.equal('Default content.');
+			expect(namedSlot.textContent).to.equal('Content for named slot.');
+		});
+
+		it('supports glob imports - <Component.default />', async () => {
+			const html = await fixture.readFile('/glob/index.html');
+			const { document } = parseHTML(html);
+
+			const h1 = document.querySelector('[data-default-export] h1');
+			const defaultSlot = document.querySelector('[data-default-export] [data-default-slot]');
+			const namedSlot = document.querySelector('[data-default-export] [data-named-slot]');
+
+			expect(h1.textContent).to.equal('Hello slotted component!');
+			expect(defaultSlot.textContent).to.equal('Default content.');
+			expect(namedSlot.textContent).to.equal('Content for named slot.');
+		});
+
+		it('supports glob imports - <Content />', async () => {
+			const html = await fixture.readFile('/glob/index.html');
+			const { document } = parseHTML(html);
+
+			const h1 = document.querySelector('[data-content-export] h1');
+			const defaultSlot = document.querySelector('[data-content-export] [data-default-slot]');
+			const namedSlot = document.querySelector('[data-content-export] [data-named-slot]');
+
+			expect(h1.textContent).to.equal('Hello slotted component!');
+			expect(defaultSlot.textContent).to.equal('Default content.');
+			expect(namedSlot.textContent).to.equal('Content for named slot.');
+		});
+	});
+
+	describe('dev', () => {
+		let devServer;
+
+		before(async () => {
+			devServer = await fixture.startDevServer();
+		});
+
+		after(async () => {
+			await devServer.stop();
+		});
+
+		it('supports top-level imports', async () => {
+			const res = await fixture.fetch('/');
+
+			expect(res.status).to.equal(200);
+
+			const html = await res.text();
+			const { document } = parseHTML(html);
+
+			const h1 = document.querySelector('h1');
+			const defaultSlot = document.querySelector('[data-default-slot]');
+			const namedSlot = document.querySelector('[data-named-slot]');
+
+			expect(h1.textContent).to.equal('Hello slotted component!');
+			expect(defaultSlot.textContent).to.equal('Default content.');
+			expect(namedSlot.textContent).to.equal('Content for named slot.');
+		});
+
+		it('supports glob imports - <Component.default />', async () => {
+			const res = await fixture.fetch('/glob');
+
+			expect(res.status).to.equal(200);
+
+			const html = await res.text();
+			const { document } = parseHTML(html);
+
+			const h1 = document.querySelector('[data-default-export] h1');
+			const defaultSlot = document.querySelector('[data-default-export] [data-default-slot]');
+			const namedSlot = document.querySelector('[data-default-export] [data-named-slot]');
+
+			expect(h1.textContent).to.equal('Hello slotted component!');
+			expect(defaultSlot.textContent).to.equal('Default content.');
+			expect(namedSlot.textContent).to.equal('Content for named slot.');
+		});
+
+		it('supports glob imports - <Content />', async () => {
+			const res = await fixture.fetch('/glob');
+
+			expect(res.status).to.equal(200);
+
+			const html = await res.text();
+			const { document } = parseHTML(html);
+
+			const h1 = document.querySelector('[data-content-export] h1');
+			const defaultSlot = document.querySelector('[data-content-export] [data-default-slot]');
+			const namedSlot = document.querySelector('[data-content-export] [data-named-slot]');
+
+			expect(h1.textContent).to.equal('Hello slotted component!');
+			expect(defaultSlot.textContent).to.equal('Default content.');
+			expect(namedSlot.textContent).to.equal('Content for named slot.');
+		});
+	});
+});