diff --git a/tests/_selftest.ts b/tests/_selftest.ts
index 7a242a8..1608fb0 100644
--- a/tests/_selftest.ts
+++ b/tests/_selftest.ts
@@ -1,5 +1,4 @@
 import path from 'node:path'
-import fs from 'node:fs'
 import { runInRepo } from '../utils'
 import { RunOptions } from '../types'
 
@@ -7,24 +6,23 @@ export async function test(options: RunOptions) {
 	await runInRepo({
 		...options,
 		repo: 'vuejs/ecosystem-ci',
-		build: async () => {
-			const dir = path.resolve(options.workspace, 'ecosystem-ci')
-			const pkgFile = path.join(dir, 'package.json')
-			const pkg = JSON.parse(await fs.promises.readFile(pkgFile, 'utf-8'))
-			if (pkg.name !== '@vue/ecosystem-ci') {
-				throw new Error(
-					`invalid checkout, expected package.json with "name": "@vue/ecosystem-ci" in ${dir}`,
-				)
-			}
-			pkg.scripts.selftestscript =
-				"[ -d ../../core/packages/vue/dist ] || (echo 'vue build failed' && exit 1)"
-			await fs.promises.writeFile(
-				pkgFile,
-				JSON.stringify(pkg, null, 2),
-				'utf-8',
-			)
-		},
 		test: 'pnpm run selftestscript',
 		verify: false,
+		patchFiles: {
+			'package.json': (content) => {
+				const pkg = JSON.parse(content)
+				if (pkg.name !== '@vue/ecosystem-ci') {
+					throw new Error(
+						`invalid checkout, expected package.json with "name": "@vue/ecosystem-ci" in ${path.resolve(
+							options.workspace,
+							'ecosystem-ci',
+						)}`,
+					)
+				}
+				pkg.scripts.selftestscript =
+					"[ -d ../../core/packages/vue/dist ] || (echo 'vue build failed' && exit 1)"
+				return JSON.stringify(pkg, null, 2)
+			},
+		},
 	})
 }
diff --git a/tests/quasar.ts b/tests/quasar.ts
index f9b4671..6bdee91 100644
--- a/tests/quasar.ts
+++ b/tests/quasar.ts
@@ -1,5 +1,3 @@
-import fs from 'node:fs'
-import path from 'node:path'
 import { runInRepo } from '../utils'
 import { RunOptions } from '../types'
 
@@ -9,26 +7,17 @@ export async function test(options: RunOptions) {
 		repo: 'quasarframework/quasar',
 		branch: 'dev',
 		build: 'vue-ecosystem-ci:build',
+		test: 'vue-ecosystem-ci:test',
 		// Need to skip QSelect tests until https://github.com/quasarframework/quasar-testing/issues/343 is resolved
-		beforeTest: async () => {
-			const dir = path.resolve(options.workspace, 'quasar')
-			const cypressConfigPath = path.resolve(dir, 'ui/dev/cypress.config.cjs')
-			const cypressConfigFile = await fs.promises.readFile(
-				cypressConfigPath,
-				'utf-8',
-			)
-			await fs.promises.writeFile(
-				cypressConfigPath,
-				cypressConfigFile +
-					`
-module.exports.component.excludeSpecPattern = [
-	'../src/components/**/QSelect.cy.js',
-	'../src/composables/**/use-validate.cy.js'
-]
-`,
-				'utf-8',
-			)
+		patchFiles: {
+			'ui/dev/cypress.config.cjs': (content) =>
+				content +
+				`
+					module.exports.component.excludeSpecPattern = [
+						'../src/components/**/QSelect.cy.js',
+						'../src/composables/**/use-validate.cy.js'
+					]
+					`,
 		},
-		test: 'vue-ecosystem-ci:test',
 	})
 }