diff --git a/tests/laravel.ts b/tests/laravel.ts
index 9098fc2b..d422afb1 100644
--- a/tests/laravel.ts
+++ b/tests/laravel.ts
@@ -1,5 +1,7 @@
 import { runInRepo } from '../utils.ts'
 import type { RunOptions } from '../types.d.ts'
+import path from 'node:path'
+import fs from 'node:fs'
 
 export async function test(options: RunOptions) {
 	//see https://github.com/laravel/vite-plugin/blob/73466441b0c9eb0c1a5ce0a0e937bd83eaef4b70/.github/workflows/tests.yml#L10
@@ -7,8 +9,35 @@ export async function test(options: RunOptions) {
 	await runInRepo({
 		...options,
 		repo: 'laravel/vite-plugin',
-		branch: '1.x',
+		branch: '2.x',
 		build: 'build',
+		async beforeTest() {
+			// Add `vitest.config.ts` to exclude Vite from inlined by Vitest.
+			// Otherwise the mock here doesn't work.
+			// https://github.com/laravel/vite-plugin/blob/3f7bf9eddc69580796c26890c99065d7259c785e/tests/index.test.ts#L7-L22
+			const dir = path.resolve(options.workspace, 'vite-plugin')
+			const vitestConfigFile = path.join(dir, 'vitest.config.ts')
+			fs.writeFileSync(
+				vitestConfigFile,
+				getVitestConfig(options.vitePath),
+				'utf-8',
+			)
+		},
 		test: 'test',
+		agent: 'npm',
 	})
 }
+
+const getVitestConfig = (viteRepoPath: string) => /* ts */ `
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+    test: {
+        deps: {
+            moduleDirectories: [
+                ${JSON.stringify(path.resolve(viteRepoPath, 'packages'))},
+            ],
+        },
+    },
+});
+`
diff --git a/utils.ts b/utils.ts
index 55ef8ced..7cf35596 100644
--- a/utils.ts
+++ b/utils.ts
@@ -352,7 +352,7 @@ export async function runInRepo(options: RunOptions & RepoOptions) {
 			...localOverrides,
 		}
 	}
-	await applyPackageOverrides(dir, pkg, overrides)
+	await applyPackageOverrides(agent, dir, pkg, overrides)
 	await beforeBuildCommand?.(pkg.scripts)
 	await buildCommand?.(pkg.scripts)
 	if (test) {
@@ -525,6 +525,7 @@ async function overridePackageManagerVersion(
 }
 
 export async function applyPackageOverrides(
+	agent: (typeof AGENTS)[number],
 	dir: string,
 	pkg: any,
 	overrides: Overrides = {},
@@ -540,10 +541,6 @@ export async function applyPackageOverrides(
 	)
 	await $`git clean -fdxq` // remove current install
 
-	const agent = await detect({ cwd: dir, autoInstall: false })
-	if (!agent) {
-		throw new Error(`failed to detect packageManager in ${dir}`)
-	}
 	// Remove version from agent string:
 	// yarn@berry => yarn
 	// pnpm@6, pnpm@7 => pnpm