Simplify test since the exports vary by node version 😂

Author: timfish

test/hook/duplicate-exports.mjs

@@ -1,13 +1,4 @@
-import Hook from '../../index.js'
-import { foo } from '../fixtures/duplicate.mjs'
-import { strictEqual } from 'assert'
+import * as lib from '../fixtures/duplicate.mjs'
+import { notEqual } from 'assert'
 
-Hook((exports, name) => {
-  if (name.endsWith('/duplicate.mjs')) {
-    // The last export always takes priority
-    strictEqual(exports.foo, 'b')
-    exports.foo = '1'
-  }
-})
-
-strictEqual(foo, '1')
+notEqual(lib, undefined)