diff --git a/.gitignore b/.gitignore
index c9c3cfdefd..4d34676c59 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,6 @@
 .nyc_output
 build
 node_modules
-test
 src/**.js
 coverage
 *.log
diff --git a/examples/min-js-web-chat/package.json b/examples/min-js-web-chat/package.json
index 46ee30c699..2c5723d1c0 100644
--- a/examples/min-js-web-chat/package.json
+++ b/examples/min-js-web-chat/package.json
@@ -16,7 +16,7 @@
   "scripts": {
     "start": "react-scripts start",
     "build": "react-scripts build",
-    "test": "react-scripts test",
+    "test": "react-scripts test --env=./test/custom-test-env.js",
     "eject": "react-scripts eject"
   },
   "eslintConfig": {
diff --git a/examples/min-js-web-chat/test/custom-test-env.js b/examples/min-js-web-chat/test/custom-test-env.js
new file mode 100644
index 0000000000..e24fa776a4
--- /dev/null
+++ b/examples/min-js-web-chat/test/custom-test-env.js
@@ -0,0 +1,12 @@
+const Environment = require('jest-environment-jsdom');
+
+module.exports = class CustomTestEnvironment extends Environment {
+  async setup() {
+    await super.setup();
+    if (typeof this.global.TextEncoder === 'undefined') {
+      const { TextEncoder, TextDecoder } = require('util');
+      this.global.TextEncoder = TextEncoder;
+      this.global.TextDecoder = TextDecoder;
+    }
+  }
+};