diff --git a/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/astro.config.mjs b/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/astro.config.mjs
new file mode 100644
index 000000000..b0774efd6
--- /dev/null
+++ b/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/astro.config.mjs
@@ -0,0 +1,23 @@
+import mdx from '@astrojs/mdx';
+import { jsToMdxTreeNode } from '@astrojs/mdx/utils';
+
+export default {
+	site: 'https://mdx-is-neat.com/',
+	markdown: {
+		syntaxHighlight: false,
+	},
+	integrations: [mdx({
+		remarkPlugins: [
+			function injectComponentsExport() {
+				const titlePath = new URL('./src/components/Title.astro', import.meta.url).pathname;
+				return (tree) => {
+					tree.children.unshift(
+						jsToMdxTreeNode(`
+						import Title from ${JSON.stringify(titlePath)};
+						export const components = { h1: Title };
+					`));
+				};
+			}
+		]
+	})],
+}
diff --git a/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/package.json b/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/package.json
new file mode 100644
index 000000000..6a83be3e3
--- /dev/null
+++ b/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "@test/mdx-utils-jstomdxtreenode",
+  "dependencies": {
+    "astro": "workspace:*",
+    "@astrojs/mdx": "workspace:*"
+  }
+}
diff --git a/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/src/components/Title.astro b/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/src/components/Title.astro
new file mode 100644
index 000000000..e6dc381e2
--- /dev/null
+++ b/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/src/components/Title.astro
@@ -0,0 +1 @@
+<h1 data-is-title-component><slot></slot></h1>
diff --git a/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/src/pages/index.mdx b/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/src/pages/index.mdx
new file mode 100644
index 000000000..c6c91f4ec
--- /dev/null
+++ b/packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode/src/pages/index.mdx
@@ -0,0 +1,3 @@
+# Injected header test
+
+Let's see if that header maps to our Astro component!
diff --git a/packages/integrations/mdx/test/mdx-utils-jsToMdxTreeNode.test.js b/packages/integrations/mdx/test/mdx-utils-jsToMdxTreeNode.test.js
new file mode 100644
index 000000000..373fd08c1
--- /dev/null
+++ b/packages/integrations/mdx/test/mdx-utils-jsToMdxTreeNode.test.js
@@ -0,0 +1,22 @@
+import { expect } from 'chai';
+import { parseHTML } from 'linkedom';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+
+describe('MDX utils - jsToMdxTreeNode', () => {
+	let fixture;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: new URL('./fixtures/mdx-utils-jsToMdxTreeNode/', import.meta.url),
+		});
+
+		await fixture.build();
+	});
+
+	it('Successfully injects title component export', async () => {
+		const html = await fixture.readFile('/index.html');
+		const { document } = parseHTML(html);
+
+		expect(document.querySelector('[data-is-title-component]')).to.not.be.null;
+	});
+});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 116192d3c..0f827adbf 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -2539,6 +2539,14 @@ importers:
       '@astrojs/react': link:../../../../react
       astro: link:../../../../../astro
 
+  packages/integrations/mdx/test/fixtures/mdx-utils-jsToMdxTreeNode:
+    specifiers:
+      '@astrojs/mdx': workspace:*
+      astro: workspace:*
+    dependencies:
+      '@astrojs/mdx': link:../../..
+      astro: link:../../../../../astro
+
   packages/integrations/mdx/test/fixtures/mdx-vite-env-vars:
     specifiers:
       '@astrojs/mdx': workspace:*