Add test for mdx + React usage (#4174)

* Add test for mdx + React usage

* Add a changeset

Co-authored-by: Nate Moore <natemoo-re@users.noreply.github.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/packages/integrations/mdx/test/mdx-plus-react.test.js b/packages/integrations/mdx/test/mdx-plus-react.test.js
new file mode 100644
index 000000000..49c25d558
--- /dev/null
+++ b/packages/integrations/mdx/test/mdx-plus-react.test.js
@@ -0,0 +1,25 @@
+import mdx from '@astrojs/mdx';
+
+import { expect } from 'chai';
+import { parseHTML } from 'linkedom';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+
+describe('MDX and React', () => {
+	let fixture;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: new URL('./fixtures/mdx-plus-react/', import.meta.url),
+		});
+		await fixture.build();
+	});
+
+	it('can be used in the same project', async () => {
+		const html = await fixture.readFile('/index.html');
+		const { document } = parseHTML(html);
+
+		const p = document.querySelector('p');
+
+		expect(p.textContent).to.equal('Hello world');
+	});
+});