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diff --git a/packages/integrations/mdx/test/css-head-mdx.test.js b/packages/integrations/mdx/test/css-head-mdx.test.js
new file mode 100644
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+++ b/packages/integrations/mdx/test/css-head-mdx.test.js
@@ -0,0 +1,101 @@
+import mdx from '@astrojs/mdx';
+
+import * as assert from 'node:assert/strict';
+import { before, describe, it } from 'node:test';
+import * as cheerio from 'cheerio';
+import { parseHTML } from 'linkedom';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+
+describe('Head injection w/ MDX', () => {
+	let fixture;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: new URL('./fixtures/css-head-mdx/', import.meta.url),
+			integrations: [mdx()],
+			// test suite was authored when inlineStylesheets defaulted to never
+			build: { inlineStylesheets: 'never' },
+		});
+	});
+
+	describe('build', () => {
+		before(async () => {
+			await fixture.build();
+		});
+
+		it('injects content styles into head', async () => {
+			const html = await fixture.readFile('/indexThree/index.html');
+			const { document } = parseHTML(html);
+
+			const links = document.querySelectorAll('head link[rel=stylesheet]');
+			assert.equal(links.length, 1);
+
+			const scripts = document.querySelectorAll('script[type=module]');
+			assert.equal(scripts.length, 1);
+		});
+
+		it('injects into the head for content collections', async () => {
+			const html = await fixture.readFile('/posts/test/index.html');
+			const { document } = parseHTML(html);
+
+			const links = document.querySelectorAll('head link[rel=stylesheet]');
+			assert.equal(links.length, 1);
+		});
+
+		it('injects content from a component using Content#render()', async () => {
+			const html = await fixture.readFile('/DirectContentUsage/index.html');
+			const { document } = parseHTML(html);
+
+			const links = document.querySelectorAll('head link[rel=stylesheet]');
+			assert.equal(links.length, 1);
+
+			const scripts = document.querySelectorAll('script[type=module]');
+			assert.equal(scripts.length, 1);
+		});
+
+		it('Using component using slots.render() API', async () => {
+			const html = await fixture.readFile('/remote/index.html');
+			const { document } = parseHTML(html);
+
+			const links = document.querySelectorAll('head link[rel=stylesheet]');
+			assert.equal(links.length, 1);
+		});
+
+		it('Using component but no layout', async () => {
+			const html = await fixture.readFile('/noLayoutWithComponent/index.html');
+			// Using cheerio here because linkedom doesn't support head tag injection
+			const $ = cheerio.load(html);
+
+			const headLinks = $('head link[rel=stylesheet]');
+			assert.equal(headLinks.length, 1);
+
+			const bodyLinks = $('body link[rel=stylesheet]');
+			assert.equal(bodyLinks.length, 0);
+		});
+
+		it('JSX component rendering Astro children within head buffering phase', async () => {
+			const html = await fixture.readFile('/posts/using-component/index.html');
+			// Using cheerio here because linkedom doesn't support head tag injection
+			const $ = cheerio.load(html);
+
+			const headLinks = $('head link[rel=stylesheet]');
+			assert.equal(headLinks.length, 1);
+
+			const bodyLinks = $('body link[rel=stylesheet]');
+			assert.equal(bodyLinks.length, 0);
+		});
+
+		it('Injection caused by delayed slots', async () => {
+			const html = await fixture.readFile('/componentwithtext/index.html');
+
+			// Using cheerio here because linkedom doesn't support head tag injection
+			const $ = cheerio.load(html);
+
+			const headLinks = $('head link[rel=stylesheet]');
+			assert.equal(headLinks.length, 1);
+
+			const bodyLinks = $('body link[rel=stylesheet]');
+			assert.equal(bodyLinks.length, 0);
+		});
+	});
+});