diff --git a/arduino-ide-extension/src/test/browser/fixtures/serial.ts b/arduino-ide-extension/src/test/browser/fixtures/serial.ts
deleted file mode 100644
index ab8b333a..00000000
--- a/arduino-ide-extension/src/test/browser/fixtures/serial.ts
+++ /dev/null
@@ -1,22 +0,0 @@
-import { SerialConfig } from '../../../common/protocol/serial-service';
-import { aBoard, anotherBoard, anotherPort, aPort } from './boards';
-
-export const aSerialConfig: SerialConfig = {
-  board: aBoard,
-  port: aPort,
-  baudRate: 9600,
-};
-
-export const anotherSerialConfig: SerialConfig = {
-  board: anotherBoard,
-  port: anotherPort,
-  baudRate: 9600,
-};
-
-export class WebSocketMock {
-  readonly url: string;
-  constructor(url: string) {
-    this.url = url;
-  }
-  close() {}
-}