diff --git a/__tests__/services/VoiceService.test.ts b/__tests__/services/VoiceService.test.ts
new file mode 100644
index 0000000..bdcc28e
--- /dev/null
+++ b/__tests__/services/VoiceService.test.ts
@@ -0,0 +1,219 @@
+import React from "react";
+import { expect } from "@jest/globals";
+import {
+  startVoiceRecording,
+  stopVoiceRecording,
+  syncVoiceWithChatInput,
+} from "../../src/services/VoiceService";
+import { Settings } from "../../src/types/Settings";
+import { RefObject } from "react";
+
+describe("VoiceService", () => {
+  let mockInputRef: RefObject<HTMLInputElement | null>;
+
+  beforeAll(() => {
+    // Mock MediaStream
+    class MockMediaStream {
+      active = true;
+      id = "mock-stream";
+      getTracks() {
+        return [];
+      }
+      addTrack() {}
+      removeTrack() {}
+    }
+    global.MediaStream = MockMediaStream as unknown as typeof MediaStream;
+
+    // Mock MediaRecorder
+    class MockMediaRecorder {
+      state = "inactive";
+      start = jest.fn();
+      stop = jest.fn();
+      ondataavailable: ((event: any) => void) | null = null;
+      onstop: (() => void) | null = null;
+
+      constructor() {}
+    }
+    global.MediaRecorder = MockMediaRecorder as unknown as typeof MediaRecorder;
+  });
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+
+    mockInputRef = { current: document.createElement("input") };
+
+    // Mock SpeechRecognition
+    Object.defineProperty(window, "SpeechRecognition", {
+      configurable: true,
+      value: jest.fn().mockImplementation(() => ({
+        start: jest.fn(),
+        stop: jest.fn(),
+        onresult: jest.fn(),
+        onend: jest.fn(),
+      })),
+    });
+
+    // Mock navigator.mediaDevices
+    Object.defineProperty(navigator, "mediaDevices", {
+      configurable: true,
+      value: {
+        getUserMedia: jest.fn(),
+      },
+    });
+  });
+
+  afterEach(() => {
+    jest.restoreAllMocks();
+  });
+
+  describe("SpeechRecognition", () => {
+    it("starts voice recording with SpeechRecognition", () => {
+      const mockToggleVoice = jest.fn();
+      const mockTriggerSendVoiceInput = jest.fn();
+      const mockSetTextAreaValue = jest.fn();
+      const mockSetInputLength = jest.fn();
+      const mockAudioChunksRef: RefObject<BlobPart[]> = { current: [] };
+
+      const mockSettings: Settings = {
+        voice: {
+          sendAsAudio: false,
+          language: "en-US",
+          timeoutPeriod: 5000,
+          autoSendPeriod: 3000,
+          autoSendDisabled: false,
+        },
+      };
+
+      startVoiceRecording(
+        mockSettings,
+        mockToggleVoice,
+        mockTriggerSendVoiceInput,
+        mockSetTextAreaValue,
+        mockSetInputLength,
+        mockAudioChunksRef,
+        mockInputRef
+      );
+
+      expect(mockToggleVoice).not.toHaveBeenCalled();
+    });
+
+    it("handles error during SpeechRecognition initialization gracefully", () => {
+      Object.defineProperty(window, "SpeechRecognition", {
+        configurable: true,
+        value: jest.fn(() => {
+          throw new Error("SpeechRecognition not supported");
+        }),
+      });
+
+      const mockToggleVoice = jest.fn();
+      const mockTriggerSendVoiceInput = jest.fn();
+      const mockSetTextAreaValue = jest.fn();
+      const mockSetInputLength = jest.fn();
+      const mockAudioChunksRef: RefObject<BlobPart[]> = { current: [] };
+
+      const mockSettings: Settings = {
+        voice: {
+          sendAsAudio: false,
+          language: "en-US",
+          timeoutPeriod: 5000,
+          autoSendPeriod: 3000,
+        },
+      };
+
+      expect(() => {
+        startVoiceRecording(
+          mockSettings,
+          mockToggleVoice,
+          mockTriggerSendVoiceInput,
+          mockSetTextAreaValue,
+          mockSetInputLength,
+          mockAudioChunksRef,
+          mockInputRef
+        );
+      }).not.toThrow();
+    });
+  });
+
+  describe("Audio Recording", () => {
+    it("does not start MediaRecorder if microphone permissions are denied", async () => {
+      jest
+        .spyOn(navigator.mediaDevices, "getUserMedia")
+        .mockRejectedValueOnce(new Error("Permission denied"));
+
+      const mockToggleVoice = jest.fn();
+      const mockTriggerSendVoiceInput = jest.fn();
+      const mockSetTextAreaValue = jest.fn();
+      const mockSetInputLength = jest.fn();
+      const mockAudioChunksRef: RefObject<BlobPart[]> = { current: [] };
+
+      const mockSettings: Settings = {
+        voice: { sendAsAudio: true },
+      };
+
+      try {
+        await startVoiceRecording(
+          mockSettings,
+          mockToggleVoice,
+          mockTriggerSendVoiceInput,
+          mockSetTextAreaValue,
+          mockSetInputLength,
+          mockAudioChunksRef,
+          mockInputRef
+        );
+      } catch (error) {
+        if (error instanceof Error) {
+          expect(error.message).toBe("Permission denied");
+        } else {
+          throw error;
+        }
+      }
+    });
+
+    it("handles audio recording with MediaRecorder", async () => {
+      const mockToggleVoice = jest.fn();
+      const mockTriggerSendVoiceInput = jest.fn();
+      const mockSetTextAreaValue = jest.fn();
+      const mockSetInputLength = jest.fn();
+      const mockAudioChunksRef: RefObject<BlobPart[]> = { current: [] };
+
+      const mockSettings: Settings = {
+        voice: {
+          sendAsAudio: true,
+        },
+      };
+
+      navigator.mediaDevices.getUserMedia = jest
+        .fn()
+        .mockResolvedValueOnce(new MediaStream());
+
+      await startVoiceRecording(
+        mockSettings,
+        mockToggleVoice,
+        mockTriggerSendVoiceInput,
+        mockSetTextAreaValue,
+        mockSetInputLength,
+        mockAudioChunksRef,
+        mockInputRef
+      );
+
+      expect(navigator.mediaDevices.getUserMedia).toHaveBeenCalledWith({
+        audio: true,
+      });
+    });
+  });
+
+  it("stops voice recording without errors", () => {
+    stopVoiceRecording();
+    expect(true).toBe(true); // Dummy check
+  });
+
+  it("syncs voice recording with chat input", () => {
+    const mockSettings: Settings = {
+      voice: { disabled: false },
+      chatInput: { blockSpam: true },
+    };
+
+    syncVoiceWithChatInput(true, mockSettings);
+    expect(true).toBe(true); // Dummy check
+  });
+});