diff --git a/test/unit/setup.js b/test/unit/setup.js
index db6e23bce625..0ac610c5e831 100644
--- a/test/unit/setup.js
+++ b/test/unit/setup.js
@@ -24,6 +24,8 @@ function setUpDomEnvironment() {
 
   global.window = window
   global.document = window.document
+  global.TextEncoder = window.TextEncoder
+  global.TextDecoder = window.TextDecoder
   global.navigator = {
     userAgent: "node.js",
   }