Fix vercel build error when passing `includeFiles` (#7677)

3 files changed, 15 insertions, 3 deletions

diff --git a/packages/integrations/vercel/test/fixtures/serverless-prerender/astro.config.mjs b/packages/integrations/vercel/test/fixtures/serverless-prerender/astro.config.mjs
index 03228c5df..84b96c27d 100644
--- a/packages/integrations/vercel/test/fixtures/serverless-prerender/astro.config.mjs
+++ b/packages/integrations/vercel/test/fixtures/serverless-prerender/astro.config.mjs
@@ -2,6 +2,9 @@ import { defineConfig } from 'astro/config';
 import vercel from '@astrojs/vercel/serverless';
 
 export default defineConfig({
-	adapter: vercel(),
+	adapter: vercel({
+		// Pass some value to make sure it doesn't error out
+		includeFiles: ['included.js']
+	}),
 	output: 'server'
 });
diff --git a/packages/integrations/vercel/test/fixtures/serverless-prerender/included.js b/packages/integrations/vercel/test/fixtures/serverless-prerender/included.js
new file mode 100644
index 000000000..4e64b2d61
--- /dev/null
+++ b/packages/integrations/vercel/test/fixtures/serverless-prerender/included.js
@@ -0,0 +1 @@
+'works'
\ No newline at end of file
diff --git a/packages/integrations/vercel/test/serverless-prerender.test.js b/packages/integrations/vercel/test/serverless-prerender.test.js
index 18b165340..292e92b69 100644
--- a/packages/integrations/vercel/test/serverless-prerender.test.js
+++ b/packages/integrations/vercel/test/serverless-prerender.test.js
@@ -10,12 +10,20 @@ describe('Serverless prerender', () => {
 		fixture = await loadFixture({
 			root: './fixtures/serverless-prerender/',
 		});
+		await fixture.build();
 	});
 
 	it('build successful', async () => {
-		await fixture.build();
 		expect(await fixture.readFile('../.vercel/output/static/index.html')).to.be.ok;
 	});
+
+	it('includeFiles work', async () => {
+		expect(
+			await fixture.readFile(
+				'../.vercel/output/functions/render.func/packages/integrations/vercel/test/fixtures/serverless-prerender/included.js'
+			)
+		).to.be.ok;
+	});
 });
 
 describe('Serverless hybrid rendering', () => {
@@ -28,10 +36,10 @@ describe('Serverless hybrid rendering', () => {
 			root: './fixtures/serverless-prerender/',
 			output: 'hybrid',
 		});
+		await fixture.build();
 	});
 
 	it('build successful', async () => {
-		await fixture.build();
 		expect(await fixture.readFile('../.vercel/output/static/index.html')).to.be.ok;
 	});
 });