fix(e2e): make transformImport fixture self-contained

Author: 9aoy

e2e/adapterTransformImport/fixtures/demo-lib/foo.js

@@ -0,0 +1,2 @@
+export const foo = () => 'actual';
+export default foo;

e2e/adapterTransformImport/fixtures/demo-lib/index.js

@@ -0,0 +1 @@
+export { foo } from './foo.js';

e2e/adapterTransformImport/fixtures/rstest.config.mts

@@ -2,6 +2,11 @@ import { defineConfig } from '@rstest/core';
 
 export default defineConfig({
   include: ['tests/**/*.test.ts'],
+  resolve: {
+    alias: {
+      'demo-lib': './demo-lib',
+    },
+  },
   source: {
     transformImport: [
       {