4 files changed, 76 insertions, 0 deletions
diff --git a/packages/integrations/mdx/test/fixtures/mdx-syntax-hightlighting/src/pages/index.mdx b/packages/integrations/mdx/test/fixtures/mdx-syntax-hightlighting/src/pages/index.mdx
new file mode 100644
index 000000000..23338ffd8
--- /dev/null
+++ b/packages/integrations/mdx/test/fixtures/mdx-syntax-hightlighting/src/pages/index.mdx
@@ -0,0 +1,9 @@
+# Syntax highlighting
+
+```astro
+---
+const handlesAstroSyntax = true
+---
+
+<h1>{handlesAstroSyntax}</h1>
+```
diff --git a/packages/integrations/mdx/test/mdx-frontmatter.js b/packages/integrations/mdx/test/mdx-frontmatter.test.js
index 3021f926f..3021f926f 100644
--- a/packages/integrations/mdx/test/mdx-frontmatter.js
+++ b/packages/integrations/mdx/test/mdx-frontmatter.test.js
diff --git a/packages/integrations/mdx/test/mdx-syntax-highlighting.test.js b/packages/integrations/mdx/test/mdx-syntax-highlighting.test.js
new file mode 100644
index 000000000..d2bbb9266
--- /dev/null
+++ b/packages/integrations/mdx/test/mdx-syntax-highlighting.test.js
@@ -0,0 +1,67 @@
+import mdx from '@astrojs/mdx';
+
+import { expect } from 'chai';
+import { parseHTML } from 'linkedom';
+import { loadFixture } from '../../../astro/test/test-utils.js';
+
+const FIXTURE_ROOT = new URL('./fixtures/mdx-syntax-hightlighting/', import.meta.url);
+
+describe('MDX syntax highlighting', () => {
+	describe('shiki', () => {
+		it('works', async () => {
+			const fixture = await loadFixture({
+				root: FIXTURE_ROOT,
+				markdown: {
+					syntaxHighlight: 'shiki',
+				},
+				integrations: [mdx()],
+			});
+			await fixture.build();
+	
+			const html = await fixture.readFile('/index.html');
+			const { document } = parseHTML(html);
+	
+			const shikiCodeBlock = document.querySelector('pre.shiki');
+			expect(shikiCodeBlock).to.not.be.null;
+		});
+
+		it('respects markdown.shikiConfig.theme', async () => {
+			const fixture = await loadFixture({
+				root: FIXTURE_ROOT,
+				markdown: {
+					syntaxHighlight: 'shiki',
+					shikiConfig: {
+						theme: 'dracula',
+					},
+				},
+				integrations: [mdx()],
+			});
+			await fixture.build();
+	
+			const html = await fixture.readFile('/index.html');
+			const { document } = parseHTML(html);
+	
+			const shikiCodeBlock = document.querySelector('pre.shiki.dracula');
+			expect(shikiCodeBlock).to.not.be.null;
+		});
+	});
+
+	describe('prism', () => {
+		it('works', async () => {
+			const fixture = await loadFixture({
+				root: FIXTURE_ROOT,
+				markdown: {
+					syntaxHighlight: 'prism',
+				},
+				integrations: [mdx()],
+			});
+			await fixture.build();
+	
+			const html = await fixture.readFile('/index.html');
+			const { document } = parseHTML(html);
+	
+			const prismCodeBlock = document.querySelector('pre.language-astro');
+			expect(prismCodeBlock).to.not.be.null;
+		});
+	});
+});
diff --git a/packages/integrations/mdx/test/mdx-url-export.js b/packages/integrations/mdx/test/mdx-url-export.test.js
index 76d6709f0..76d6709f0 100644
--- a/packages/integrations/mdx/test/mdx-url-export.js
+++ b/packages/integrations/mdx/test/mdx-url-export.test.js