1 files changed, 147 insertions, 0 deletions
diff --git a/packages/astro/test/units/dev/collections-mixed-content-errors.test.js b/packages/astro/test/units/dev/collections-mixed-content-errors.test.js
new file mode 100644
index 000000000..295662c93
--- /dev/null
+++ b/packages/astro/test/units/dev/collections-mixed-content-errors.test.js
@@ -0,0 +1,147 @@
+import * as assert from 'node:assert/strict';
+import { describe, it } from 'node:test';
+import _sync from '../../../dist/core/sync/index.js';
+import { createFixture } from '../test-utils.js';
+
+async function sync(root) {
+	try {
+		await _sync({
+			root,
+			logLevel: 'silent',
+		});
+		return 0;
+	} catch {
+		return 1;
+	}
+}
+
+const baseFileTree = {
+	'/astro.config.mjs': `export default { legacy: { collections: true }}`,
+	'/src/content/authors/placeholder.json': `{ "name": "Placeholder" }`,
+	'/src/content/blog/placeholder.md': `\
+---
+title: Placeholder post
+---
+`,
+	'/src/pages/authors.astro': `\
+---
+import { getCollection } from 'astro:content';
+try {
+	await getCollection('authors')
+} catch (e) {
+	return e
+}
+---
+
+<h1>Worked</h1>
+`,
+	'/src/pages/blog.astro': `\
+---
+import { getCollection } from 'astro:content';
+
+await getCollection('blog')
+---
+
+<h1>Worked</h1>`,
+};
+
+describe('Content Collections - mixed content errors', () => {
+	it('raises "mixed content" error when content in data collection', async () => {
+		const fixture = await createFixture({
+			...baseFileTree,
+			'/src/content/authors/ben.md': `\
+---
+name: Ben
+---
+
+# Ben
+`,
+			'/src/content/authors/tony.json': `{ "name": "Tony" }`,
+			'/src/content.config.ts': `\
+import { z, defineCollection } from 'astro:content';
+
+const authors = defineCollection({
+	type: 'data',
+	schema: z.object({
+		name: z.string(),
+	}),
+});
+
+export const collections = { authors };
+`,
+		});
+
+		assert.equal(await sync(fixture.path), 1);
+	});
+
+	it('raises "mixed content" error when data in content collection', async () => {
+		const fixture = await createFixture({
+			...baseFileTree,
+			'/src/content/blog/post.md': `\
+---
+title: Post
+---
+
+# Post
+`,
+			'/src/content/blog/post.yaml': `title: YAML Post`,
+			'/src/content.config.ts': `\
+import { z, defineCollection } from 'astro:content';
+
+const blog = defineCollection({
+	type: 'content',
+	schema: z.object({
+		title: z.string(),
+	}),
+});
+
+export const collections = { blog };
+`,
+		});
+
+		assert.equal(await sync(fixture.path), 1);
+	});
+
+	it('raises error when data collection configured as content collection', async () => {
+		const fixture = await createFixture({
+			...baseFileTree,
+			'/src/content/banners/welcome.json': `{ "src": "/example", "alt": "Welcome" }`,
+			'/src/content/config.ts': `\
+import { z, defineCollection } from 'astro:content';
+
+const banners = defineCollection({
+	schema: z.object({
+		src: z.string(),
+		alt: z.string(),
+	}),
+});
+
+export const collections = { banners };
+`,
+		});
+
+		assert.equal(await sync(fixture.path), 1);
+	});
+
+	it('does not raise error for empty collection with config', async () => {
+		const fixture = await createFixture({
+			...baseFileTree,
+			// Add placeholder to ensure directory exists
+			'/src/content/i18n/_placeholder.txt': 'Need content here',
+			'/src/content.config.ts': `\
+import { z, defineCollection } from 'astro:content';
+
+const i18n = defineCollection({
+	type: 'data',
+	schema: z.object({
+		greeting: z.string(),
+	}),
+});
+
+export const collections = { i18n };
+`,
+		});
+
+		assert.equal(await sync(fixture.path), 0);
+	});
+});