diff --git a/src/utils/web-bluetooth.test.ts b/src/utils/web-bluetooth.test.ts
new file mode 100644
index 00000000..62921123
--- /dev/null
+++ b/src/utils/web-bluetooth.test.ts
@@ -0,0 +1,26 @@
+import { polyfillBluetoothRemoteGATTCharacteristic } from './web-bluetooth';
+
+describe('polyfillBluetoothRemoteGATTCharacteristic', () => {
+    test('old browser falls back to writeValue', () => {
+        const char = {} as BluetoothRemoteGATTCharacteristic;
+        Object.defineProperty(char, 'writeValue', { value: 'writeValue' });
+        expect(polyfillBluetoothRemoteGATTCharacteristic(char)).toEqual({
+            xWriteValueWithResponse: 'writeValue',
+            xWriteValueWithoutResponse: 'writeValue',
+        });
+    });
+    test('new browser uses writeValueWith(out)Response', () => {
+        const char = {} as BluetoothRemoteGATTCharacteristic;
+        Object.defineProperty(char, 'writeValue', { value: 'writeValue' });
+        Object.defineProperty(char, 'writeValueWithResponse', {
+            value: 'writeValueWithResponse',
+        });
+        Object.defineProperty(char, 'writeValueWithoutResponse', {
+            value: 'writeValueWithoutResponse',
+        });
+        expect(polyfillBluetoothRemoteGATTCharacteristic(char)).toEqual({
+            xWriteValueWithResponse: 'writeValueWithResponse',
+            xWriteValueWithoutResponse: 'writeValueWithoutResponse',
+        });
+    });
+});