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diff --git a/packages/integrations/mdx/test/mdx-images.test.js b/packages/integrations/mdx/test/mdx-images.test.js
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+++ b/packages/integrations/mdx/test/mdx-images.test.js
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+import * as assert from 'node:assert/strict';
+import { after, before, describe, it } from 'node:test';
+import { parseHTML } from 'linkedom';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+
+const imageTestRoutes = ['with-components', 'esm-import', 'content-collection'];
+
+describe('MDX Page', () => {
+	let devServer;
+	let fixture;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: new URL('./fixtures/mdx-images/', import.meta.url),
+		});
+		devServer = await fixture.startDevServer();
+	});
+
+	after(async () => {
+		await devServer.stop();
+	});
+
+	describe('Optimized images in MDX', () => {
+		it('works', async () => {
+			const res = await fixture.fetch('/');
+			assert.equal(res.status, 200);
+
+			const html = await res.text();
+			const { document } = parseHTML(html);
+
+			const imgs = document.getElementsByTagName('img');
+			assert.equal(imgs.length, 6);
+			// Image using a relative path
+			assert.equal(imgs.item(0).src.startsWith('/_image'), true);
+			// Image using an aliased path
+			assert.equal(imgs.item(1).src.startsWith('/_image'), true);
+			// Image with title
+			assert.equal(imgs.item(2).title, 'Houston title');
+			// Image with spaces in the path
+			assert.equal(imgs.item(3).src.startsWith('/_image'), true);
+			// Image using a relative path with no slashes
+			assert.equal(imgs.item(4).src.startsWith('/_image'), true);
+			// Image using a relative path with nested directory
+			assert.equal(imgs.item(5).src.startsWith('/_image'), true);
+		});
+
+		for (const route of imageTestRoutes) {
+			it(`supports img component - ${route}`, async () => {
+				const res = await fixture.fetch(`/${route}`);
+				assert.equal(res.status, 200);
+
+				const html = await res.text();
+				const { document } = parseHTML(html);
+
+				const imgs = document.getElementsByTagName('img');
+				assert.equal(imgs.length, 2);
+
+				const assetsImg = imgs.item(0);
+				assert.equal(assetsImg.src.startsWith('/_image'), true);
+				assert.equal(assetsImg.hasAttribute('data-my-image'), true);
+
+				const publicImg = imgs.item(1);
+				assert.equal(publicImg.src, '/favicon.svg');
+				assert.equal(publicImg.hasAttribute('data-my-image'), true);
+			});
+		}
+	});
+
+	describe('build', () => {
+		before(async () => {
+			await fixture.build();
+		});
+		it('includes responsive styles', async () => {
+			const code = await fixture.readFile('/index.html');
+			assert.ok(code.includes('[data-astro-image]'));
+		});
+		it("doesn't include styles on pages without images", async () => {
+			const code = await fixture.readFile('/no-image/index.html');
+			assert.ok(!code.includes('[data-astro-image]'));
+		});
+	});
+});