Add test

packages/astro/test/extension-matching.test.js

@@ -0,0 +1,24 @@
+import assert from 'node:assert/strict';
+import { before, describe, it } from 'node:test';
+import * as cheerio from 'cheerio';
+import { loadFixture } from './test-utils.js';
+
+describe('Matching .astro modules', () => {
+	let fixture;
+	/** @type {string} */
+	let output;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: './fixtures/extension-matching/',
+		});
+		await fixture.build();
+		output = await fixture.readFile('./index.html');
+	});
+
+	it('loads virtual modules with .astro in query string', async () => {
+		const $ = cheerio.load(output);
+		const title = $('h1').text();
+		assert.strictEqual(title, 'true');
+	});
+});

packages/astro/test/fixtures/extension-matching/astro.config.mjs

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+import { defineConfig } from 'astro/config';
+
+const MODULE_ID = 'virtual:test';
+const RESOLVED_MODULE_ID = '\0virtual:test';
+
+export default defineConfig({
+  integrations: [
+    {
+      name: 'astro-test-invalid-transform',
+      hooks: {
+        'astro:config:setup': ({ updateConfig }) => {
+          updateConfig({
+            vite: {
+              plugins: [
+                // -----------------------------------
+                {
+                  name: 'vite-test-invalid-transform',
+                  resolveId(id) {
+                    if (id === MODULE_ID) {
+                      // Astro tries to transform this import because the query params can end with '.astro'
+                      return `${RESOLVED_MODULE_ID}?importer=index.astro`;
+                    }
+                  },
+                  load(id) {
+                    if (id.startsWith(RESOLVED_MODULE_ID)) {
+                      return `export default 'true';`;
+                    }
+                  },
+                },
+                // -----------------------------------
+              ],
+            },
+          });
+        },
+      },
+    },
+  ],
+});

packages/astro/test/fixtures/extension-matching/package.json

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+{
+  "name": "@test/extension-matching",
+  "type": "module",
+  "version": "0.0.1",
+  "private": true,
+  "scripts": {
+    "dev": "astro dev",
+    "start": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview",
+    "astro": "astro"
+  },
+  "dependencies": {
+    "astro": "workspace:*"
+  }
+}

packages/astro/test/fixtures/extension-matching/src/pages/index.astro

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+---
+let success =  'false'
+
+try {
+	success = (await import('virtual:test')).default
+} catch (e) {
+	console.error('Failed to load virtual module:', e)
+}
+
+console.log('Loaded virtual module:', success)
+---
+<h1>{String(success)}</h1>