diff --git a/script/test/jest-setup.ts b/script/test/jest-setup.ts
index 7b0828bfa..9e7e2d759 100644
--- a/script/test/jest-setup.ts
+++ b/script/test/jest-setup.ts
@@ -1 +1,5 @@
 import '@testing-library/jest-dom';
+
+import { TextEncoder, TextDecoder } from 'util';
+
+Object.assign(global, { TextDecoder, TextEncoder });