diff --git a/packages/decorator-mui/setup-tests.js b/packages/decorator-mui/setup-tests.js
new file mode 100644
index 0000000..26d5003
--- /dev/null
+++ b/packages/decorator-mui/setup-tests.js
@@ -0,0 +1,3 @@
+import { TextEncoder, TextDecoder } from 'util';
+global.TextEncoder = TextEncoder;
+global.TextDecoder = TextDecoder;
diff --git a/packages/decorator-pdf/setup-tests.js b/packages/decorator-pdf/setup-tests.js
new file mode 100644
index 0000000..26d5003
--- /dev/null
+++ b/packages/decorator-pdf/setup-tests.js
@@ -0,0 +1,3 @@
+import { TextEncoder, TextDecoder } from 'util';
+global.TextEncoder = TextEncoder;
+global.TextDecoder = TextDecoder;