fixed tests

public/js/services/UIController.ts

@@ -0,0 +1,53 @@
+import type { IUIController } from '../interfaces/IWebRTCClient.ts';
+
+export class UIController implements IUIController {
+  private statusElement: HTMLElement;
+  private subscribersCountElement: HTMLElement | null;
+  private startButton: HTMLButtonElement | null;
+  private stopButton: HTMLButtonElement | null;
+
+  constructor(
+    statusElementId: string,
+    subscribersCountElementId?: string,
+    startButtonId?: string,
+    stopButtonId?: string
+  ) {
+    this.statusElement = document.getElementById(statusElementId)!;
+    this.subscribersCountElement = subscribersCountElementId 
+      ? document.getElementById(subscribersCountElementId) 
+      : null;
+    this.startButton = startButtonId 
+      ? document.getElementById(startButtonId) as HTMLButtonElement 
+      : null;
+    this.stopButton = stopButtonId 
+      ? document.getElementById(stopButtonId) as HTMLButtonElement 
+      : null;
+  }
+
+  updateStatus(status: string, className: string): void {
+    this.statusElement.textContent = status;
+    this.statusElement.className = `status ${className}`;
+  }
+
+  updateSubscribersCount(count: number): void {
+    if (this.subscribersCountElement) {
+      this.subscribersCountElement.textContent = `Subscribers: ${count}`;
+    }
+  }
+
+  setButtonStates(startEnabled: boolean, stopEnabled: boolean): void {
+    if (this.startButton) {
+      this.startButton.disabled = !startEnabled;
+    }
+    if (this.stopButton) {
+      this.stopButton.disabled = !stopEnabled;
+    }
+  }
+
+  onButtonClick(buttonId: string, handler: () => void): void {
+    const button = document.getElementById(buttonId);
+    if (button) {
+      button.addEventListener('click', handler);
+    }
+  }
+}