diff --git a/.gitignore b/.gitignore
index eaee28a62..f28d152d9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,4 +45,5 @@ core/test_results.html
 coverage
 .yarn
 .yarnrc
+test_results.html
 *.tsbuildinfo
diff --git a/core/jest.config.js b/core/jest.config.js
index 6c805f1c9..2f652dd39 100644
--- a/core/jest.config.js
+++ b/core/jest.config.js
@@ -1,6 +1,7 @@
 module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'node',
+  collectCoverageFrom: ['src/**/*.{ts,tsx}'],
   moduleNameMapper: {
     '@/(.*)': '<rootDir>/src/$1',
   },
diff --git a/core/src/browser/extension.test.ts b/core/src/browser/extension.test.ts
index 6c1cd8579..2db14a24e 100644
--- a/core/src/browser/extension.test.ts
+++ b/core/src/browser/extension.test.ts
@@ -1,4 +1,9 @@
 import { BaseExtension } from './extension'
+import { SettingComponentProps } from '../types'
+import { getJanDataFolderPath, joinPath } from './core'
+import { fs } from './fs'
+jest.mock('./core')
+jest.mock('./fs')
 
 class TestBaseExtension extends BaseExtension {
   onLoad(): void {}
@@ -44,3 +49,103 @@ describe('BaseExtension', () => {
     // Add your assertions here
   })
 })
+
+describe('BaseExtension', () => {
+  class TestBaseExtension extends BaseExtension {
+    onLoad(): void {}
+    onUnload(): void {}
+  }
+
+  let baseExtension: TestBaseExtension
+
+  beforeEach(() => {
+    baseExtension = new TestBaseExtension('https://example.com', 'TestExtension')
+  })
+
+  afterEach(() => {
+    jest.resetAllMocks()
+  })
+
+  it('should have the correct properties', () => {
+    expect(baseExtension.name).toBe('TestExtension')
+    expect(baseExtension.productName).toBeUndefined()
+    expect(baseExtension.url).toBe('https://example.com')
+    expect(baseExtension.active).toBeUndefined()
+    expect(baseExtension.description).toBeUndefined()
+    expect(baseExtension.version).toBeUndefined()
+  })
+
+  it('should return undefined for type()', () => {
+    expect(baseExtension.type()).toBeUndefined()
+  })
+
+  it('should have abstract methods onLoad() and onUnload()', () => {
+    expect(baseExtension.onLoad).toBeDefined()
+    expect(baseExtension.onUnload).toBeDefined()
+  })
+
+  it('should have installationState() return "NotRequired"', async () => {
+    const installationState = await baseExtension.installationState()
+    expect(installationState).toBe('NotRequired')
+  })
+
+  it('should install the extension', async () => {
+    await baseExtension.install()
+    // Add your assertions here
+  })
+
+  it('should register settings', async () => {
+    const settings: SettingComponentProps[] = [
+      { key: 'setting1', controllerProps: { value: 'value1' } } as any,
+      { key: 'setting2', controllerProps: { value: 'value2' } } as any,
+    ]
+
+    ;(getJanDataFolderPath as jest.Mock).mockResolvedValue('/data')
+    ;(joinPath as jest.Mock).mockResolvedValue('/data/settings/TestExtension')
+    ;(fs.existsSync as jest.Mock).mockResolvedValue(false)
+    ;(fs.mkdir as jest.Mock).mockResolvedValue(undefined)
+    ;(fs.writeFileSync as jest.Mock).mockResolvedValue(undefined)
+
+    await baseExtension.registerSettings(settings)
+
+    expect(fs.mkdir).toHaveBeenCalledWith('/data/settings/TestExtension')
+    expect(fs.writeFileSync).toHaveBeenCalledWith(
+      '/data/settings/TestExtension',
+      JSON.stringify(settings, null, 2)
+    )
+  })
+
+  it('should get setting with default value', async () => {
+    const settings: SettingComponentProps[] = [
+      { key: 'setting1', controllerProps: { value: 'value1' } } as any,
+    ]
+
+    jest.spyOn(baseExtension, 'getSettings').mockResolvedValue(settings)
+
+    const value = await baseExtension.getSetting('setting1', 'defaultValue')
+    expect(value).toBe('value1')
+
+    const defaultValue = await baseExtension.getSetting('setting2', 'defaultValue')
+    expect(defaultValue).toBe('defaultValue')
+  })
+
+  it('should update settings', async () => {
+    const settings: SettingComponentProps[] = [
+      { key: 'setting1', controllerProps: { value: 'value1' } } as any,
+    ]
+
+    jest.spyOn(baseExtension, 'getSettings').mockResolvedValue(settings)
+    ;(getJanDataFolderPath as jest.Mock).mockResolvedValue('/data')
+    ;(joinPath as jest.Mock).mockResolvedValue('/data/settings/TestExtension/settings.json')
+    ;(fs.writeFileSync as jest.Mock).mockResolvedValue(undefined)
+
+    await baseExtension.updateSettings([
+      { key: 'setting1', controllerProps: { value: 'newValue' } } as any,
+    ])
+
+    expect(fs.writeFileSync).toHaveBeenCalledWith(
+      '/data/settings/TestExtension/settings.json',
+      JSON.stringify([{ key: 'setting1', controllerProps: { value: 'newValue' } }], null, 2)
+    )
+  })
+})
diff --git a/core/src/browser/extensions/engines/AIEngine.test.ts b/core/src/browser/extensions/engines/AIEngine.test.ts
new file mode 100644
index 000000000..59dad280f
--- /dev/null
+++ b/core/src/browser/extensions/engines/AIEngine.test.ts
@@ -0,0 +1,59 @@
+import { AIEngine } from './AIEngine'
+import { events } from '../../events'
+import { ModelEvent, Model, ModelFile, InferenceEngine } from '../../../types'
+import { EngineManager } from './EngineManager'
+import { fs } from '../../fs'
+
+jest.mock('../../events')
+jest.mock('./EngineManager')
+jest.mock('../../fs')
+
+class TestAIEngine extends AIEngine {
+  onUnload(): void {}
+  provider = 'test-provider'
+
+  inference(data: any) {}
+
+  stopInference() {}
+}
+
+describe('AIEngine', () => {
+  let engine: TestAIEngine
+
+  beforeEach(() => {
+    engine = new TestAIEngine('', '')
+    jest.clearAllMocks()
+  })
+
+  it('should load model if provider matches', async () => {
+    const model: ModelFile = { id: 'model1', engine: 'test-provider' } as any
+
+    await engine.loadModel(model)
+
+    expect(events.emit).toHaveBeenCalledWith(ModelEvent.OnModelReady, model)
+  })
+
+  it('should not load model if provider does not match', async () => {
+    const model: ModelFile = { id: 'model1', engine: 'other-provider' } as any
+
+    await engine.loadModel(model)
+
+    expect(events.emit).not.toHaveBeenCalledWith(ModelEvent.OnModelReady, model)
+  })
+
+  it('should unload model if provider matches', async () => {
+    const model: Model = { id: 'model1', version: '1.0', engine: 'test-provider' } as any
+
+    await engine.unloadModel(model)
+
+    expect(events.emit).toHaveBeenCalledWith(ModelEvent.OnModelStopped, model)
+  })
+
+  it('should not unload model if provider does not match', async () => {
+    const model: Model = { id: 'model1', version: '1.0', engine: 'other-provider' } as any
+
+    await engine.unloadModel(model)
+
+    expect(events.emit).not.toHaveBeenCalledWith(ModelEvent.OnModelStopped, model)
+  })
+})
diff --git a/core/src/browser/extensions/engines/EngineManager.test.ts b/core/src/browser/extensions/engines/EngineManager.test.ts
new file mode 100644
index 000000000..c1f1fcb71
--- /dev/null
+++ b/core/src/browser/extensions/engines/EngineManager.test.ts
@@ -0,0 +1,43 @@
+/**
+ * @jest-environment jsdom
+ */
+import { EngineManager } from './EngineManager'
+import { AIEngine } from './AIEngine'
+
+// @ts-ignore
+class MockAIEngine implements AIEngine {
+  provider: string
+  constructor(provider: string) {
+    this.provider = provider
+  }
+}
+
+describe('EngineManager', () => {
+  let engineManager: EngineManager
+
+  beforeEach(() => {
+    engineManager = new EngineManager()
+  })
+
+  test('should register an engine', () => {
+    const engine = new MockAIEngine('testProvider')
+    // @ts-ignore
+    engineManager.register(engine)
+    expect(engineManager.engines.get('testProvider')).toBe(engine)
+  })
+
+  test('should retrieve a registered engine by provider', () => {
+    const engine = new MockAIEngine('testProvider')
+    // @ts-ignore
+    engineManager.register(engine)
+    // @ts-ignore
+    const retrievedEngine = engineManager.get<MockAIEngine>('testProvider')
+    expect(retrievedEngine).toBe(engine)
+  })
+
+  test('should return undefined for an unregistered provider', () => {
+    // @ts-ignore
+    const retrievedEngine = engineManager.get<MockAIEngine>('nonExistentProvider')
+    expect(retrievedEngine).toBeUndefined()
+  })
+})
diff --git a/core/src/browser/extensions/engines/LocalOAIEngine.test.ts b/core/src/browser/extensions/engines/LocalOAIEngine.test.ts
new file mode 100644
index 000000000..4ae81496f
--- /dev/null
+++ b/core/src/browser/extensions/engines/LocalOAIEngine.test.ts
@@ -0,0 +1,100 @@
+/**
+ * @jest-environment jsdom
+ */
+import { LocalOAIEngine } from './LocalOAIEngine'
+import { events } from '../../events'
+import { ModelEvent, ModelFile, Model } from '../../../types'
+import { executeOnMain, systemInformation, dirName } from '../../core'
+
+jest.mock('../../core', () => ({
+  executeOnMain: jest.fn(),
+  systemInformation: jest.fn(),
+  dirName: jest.fn(),
+}))
+
+jest.mock('../../events', () => ({
+  events: {
+    on: jest.fn(),
+    emit: jest.fn(),
+  },
+}))
+
+class TestLocalOAIEngine extends LocalOAIEngine {
+  inferenceUrl = ''
+  nodeModule = 'testNodeModule'
+  provider = 'testProvider'
+}
+
+describe('LocalOAIEngine', () => {
+  let engine: TestLocalOAIEngine
+
+  beforeEach(() => {
+    engine = new TestLocalOAIEngine('', '')
+  })
+
+  afterEach(() => {
+    jest.clearAllMocks()
+  })
+
+  it('should subscribe to events on load', () => {
+    engine.onLoad()
+    expect(events.on).toHaveBeenCalledWith(ModelEvent.OnModelInit, expect.any(Function))
+    expect(events.on).toHaveBeenCalledWith(ModelEvent.OnModelStop, expect.any(Function))
+  })
+
+  it('should load model correctly', async () => {
+    const model: ModelFile = { engine: 'testProvider', file_path: 'path/to/model' } as any
+    const modelFolder = 'path/to'
+    const systemInfo = { os: 'testOS' }
+    const res = { error: null }
+
+    ;(dirName as jest.Mock).mockResolvedValue(modelFolder)
+    ;(systemInformation as jest.Mock).mockResolvedValue(systemInfo)
+    ;(executeOnMain as jest.Mock).mockResolvedValue(res)
+
+    await engine.loadModel(model)
+
+    expect(dirName).toHaveBeenCalledWith(model.file_path)
+    expect(systemInformation).toHaveBeenCalled()
+    expect(executeOnMain).toHaveBeenCalledWith(
+      engine.nodeModule,
+      engine.loadModelFunctionName,
+      { modelFolder, model },
+      systemInfo
+    )
+    expect(events.emit).toHaveBeenCalledWith(ModelEvent.OnModelReady, model)
+  })
+
+  it('should handle load model error', async () => {
+    const model: ModelFile = { engine: 'testProvider', file_path: 'path/to/model' } as any
+    const modelFolder = 'path/to'
+    const systemInfo = { os: 'testOS' }
+    const res = { error: 'load error' }
+
+    ;(dirName as jest.Mock).mockResolvedValue(modelFolder)
+    ;(systemInformation as jest.Mock).mockResolvedValue(systemInfo)
+    ;(executeOnMain as jest.Mock).mockResolvedValue(res)
+
+    await expect(engine.loadModel(model)).rejects.toEqual('load error')
+
+    expect(events.emit).toHaveBeenCalledWith(ModelEvent.OnModelFail, { error: res.error })
+  })
+
+  it('should unload model correctly', async () => {
+    const model: Model = { engine: 'testProvider' } as any
+
+    await engine.unloadModel(model)
+
+    expect(executeOnMain).toHaveBeenCalledWith(engine.nodeModule, engine.unloadModelFunctionName)
+    expect(events.emit).toHaveBeenCalledWith(ModelEvent.OnModelStopped, {})
+  })
+
+  it('should not unload model if engine does not match', async () => {
+    const model: Model = { engine: 'otherProvider' } as any
+
+    await engine.unloadModel(model)
+
+    expect(executeOnMain).not.toHaveBeenCalled()
+    expect(events.emit).not.toHaveBeenCalledWith(ModelEvent.OnModelStopped, {})
+  })
+})
diff --git a/core/src/browser/extensions/engines/OAIEngine.test.ts b/core/src/browser/extensions/engines/OAIEngine.test.ts
new file mode 100644
index 000000000..81348786c
--- /dev/null
+++ b/core/src/browser/extensions/engines/OAIEngine.test.ts
@@ -0,0 +1,119 @@
+/**
+ * @jest-environment jsdom
+ */
+import { OAIEngine } from './OAIEngine'
+import { events } from '../../events'
+import {
+  MessageEvent,
+  InferenceEvent,
+  MessageRequest,
+  MessageRequestType,
+  MessageStatus,
+  ChatCompletionRole,
+  ContentType,
+} from '../../../types'
+import { requestInference } from './helpers/sse'
+import { ulid } from 'ulidx'
+
+jest.mock('./helpers/sse')
+jest.mock('ulidx')
+jest.mock('../../events')
+
+class TestOAIEngine extends OAIEngine {
+  inferenceUrl = 'http://test-inference-url'
+  provider = 'test-provider'
+
+  async headers() {
+    return { Authorization: 'Bearer test-token' }
+  }
+}
+
+describe('OAIEngine', () => {
+  let engine: TestOAIEngine
+
+  beforeEach(() => {
+    engine = new TestOAIEngine('', '')
+    jest.clearAllMocks()
+  })
+
+  it('should subscribe to events on load', () => {
+    engine.onLoad()
+    expect(events.on).toHaveBeenCalledWith(MessageEvent.OnMessageSent, expect.any(Function))
+    expect(events.on).toHaveBeenCalledWith(InferenceEvent.OnInferenceStopped, expect.any(Function))
+  })
+
+  it('should handle inference request', async () => {
+    const data: MessageRequest = {
+      model: { engine: 'test-provider', id: 'test-model' } as any,
+      threadId: 'test-thread',
+      type: MessageRequestType.Thread,
+      assistantId: 'test-assistant',
+      messages: [{ role: ChatCompletionRole.User, content: 'Hello' }],
+    }
+
+    ;(ulid as jest.Mock).mockReturnValue('test-id')
+    ;(requestInference as jest.Mock).mockReturnValue({
+      subscribe: ({ next, complete }: any) => {
+        next('test response')
+        complete()
+      },
+    })
+
+    await engine.inference(data)
+
+    expect(requestInference).toHaveBeenCalledWith(
+      'http://test-inference-url',
+      expect.objectContaining({ model: 'test-model' }),
+      expect.any(Object),
+      expect.any(AbortController),
+      { Authorization: 'Bearer test-token' },
+      undefined
+    )
+
+    expect(events.emit).toHaveBeenCalledWith(
+      MessageEvent.OnMessageResponse,
+      expect.objectContaining({ id: 'test-id' })
+    )
+    expect(events.emit).toHaveBeenCalledWith(
+      MessageEvent.OnMessageUpdate,
+      expect.objectContaining({
+        content: [{ type: ContentType.Text, text: { value: 'test response', annotations: [] } }],
+        status: MessageStatus.Ready,
+      })
+    )
+  })
+
+  it('should handle inference error', async () => {
+    const data: MessageRequest = {
+      model: { engine: 'test-provider', id: 'test-model' } as any,
+      threadId: 'test-thread',
+      type: MessageRequestType.Thread,
+      assistantId: 'test-assistant',
+      messages: [{ role: ChatCompletionRole.User, content: 'Hello' }],
+    }
+
+    ;(ulid as jest.Mock).mockReturnValue('test-id')
+    ;(requestInference as jest.Mock).mockReturnValue({
+      subscribe: ({ error }: any) => {
+        error({ message: 'test error', code: 500 })
+      },
+    })
+
+    await engine.inference(data)
+
+    expect(events.emit).toHaveBeenCalledWith(
+      MessageEvent.OnMessageUpdate,
+      expect.objectContaining({
+        content: [{ type: ContentType.Text, text: { value: 'test error', annotations: [] } }],
+        status: MessageStatus.Error,
+        error_code: 500,
+      })
+    )
+  })
+
+  it('should stop inference', () => {
+    engine.stopInference()
+    expect(engine.isCancelled).toBe(true)
+    expect(engine.controller.signal.aborted).toBe(true)
+  })
+})
diff --git a/core/src/browser/extensions/engines/RemoteOAIEngine.test.ts b/core/src/browser/extensions/engines/RemoteOAIEngine.test.ts
new file mode 100644
index 000000000..871499f45
--- /dev/null
+++ b/core/src/browser/extensions/engines/RemoteOAIEngine.test.ts
@@ -0,0 +1,43 @@
+/**
+ * @jest-environment jsdom
+ */
+import { RemoteOAIEngine } from './'
+
+class TestRemoteOAIEngine extends RemoteOAIEngine {
+  inferenceUrl: string = ''
+  provider: string = 'TestRemoteOAIEngine'
+}
+
+describe('RemoteOAIEngine', () => {
+  let engine: TestRemoteOAIEngine
+
+  beforeEach(() => {
+    engine = new TestRemoteOAIEngine('', '')
+  })
+
+  test('should call onLoad and super.onLoad', () => {
+    const onLoadSpy = jest.spyOn(engine, 'onLoad')
+    const superOnLoadSpy = jest.spyOn(Object.getPrototypeOf(RemoteOAIEngine.prototype), 'onLoad')
+    engine.onLoad()
+
+    expect(onLoadSpy).toHaveBeenCalled()
+    expect(superOnLoadSpy).toHaveBeenCalled()
+  })
+
+  test('should return headers with apiKey', async () => {
+    engine.apiKey = 'test-api-key'
+    const headers = await engine.headers()
+
+    expect(headers).toEqual({
+      'Authorization': 'Bearer test-api-key',
+      'api-key': 'test-api-key',
+    })
+  })
+
+  test('should return empty headers when apiKey is not set', async () => {
+    engine.apiKey = undefined
+    const headers = await engine.headers()
+
+    expect(headers).toEqual({})
+  })
+})
diff --git a/core/src/browser/extensions/engines/helpers/sse.test.ts b/core/src/browser/extensions/engines/helpers/sse.test.ts
index cff5b93b3..0b78aa9b5 100644
--- a/core/src/browser/extensions/engines/helpers/sse.test.ts
+++ b/core/src/browser/extensions/engines/helpers/sse.test.ts
@@ -1,6 +1,7 @@
 import { lastValueFrom, Observable } from 'rxjs'
 import { requestInference } from './sse'
 
+import { ReadableStream } from 'stream/web';
 describe('requestInference', () => {
   it('should send a request to the inference server and return an Observable', () => {
     // Mock the fetch function
@@ -58,3 +59,66 @@ describe('requestInference', () => {
     expect(lastValueFrom(result)).rejects.toEqual({ message: 'Wrong API Key', code: 'invalid_api_key' })
   })
 })
+
+  it('should handle a successful response with a transformResponse function', () => {
+    // Mock the fetch function
+    const mockFetch: any = jest.fn(() =>
+      Promise.resolve({
+        ok: true,
+        json: () => Promise.resolve({ choices: [{ message: { content: 'Generated response' } }] }),
+        headers: new Headers(),
+        redirected: false,
+        status: 200,
+        statusText: 'OK',
+      })
+    )
+    jest.spyOn(global, 'fetch').mockImplementation(mockFetch)
+  
+    // Define the test inputs
+    const inferenceUrl = 'https://inference-server.com'
+    const requestBody = { message: 'Hello' }
+    const model = { id: 'model-id', parameters: { stream: false } }
+    const transformResponse = (data: any) => data.choices[0].message.content.toUpperCase()
+  
+    // Call the function
+    const result = requestInference(inferenceUrl, requestBody, model, undefined, undefined, transformResponse)
+  
+    // Assert the expected behavior
+    expect(result).toBeInstanceOf(Observable)
+    expect(lastValueFrom(result)).resolves.toEqual('GENERATED RESPONSE')
+  })
+
+
+  it('should handle a successful response with streaming enabled', () => {
+    // Mock the fetch function
+    const mockFetch: any = jest.fn(() =>
+      Promise.resolve({
+        ok: true,
+        body: new ReadableStream({
+          start(controller) {
+            controller.enqueue(new TextEncoder().encode('data: {"choices": [{"delta": {"content": "Streamed"}}]}'));
+            controller.enqueue(new TextEncoder().encode('data: [DONE]'));
+            controller.close();
+          }
+        }),
+        headers: new Headers(),
+        redirected: false,
+        status: 200,
+        statusText: 'OK',
+      })
+    );
+    jest.spyOn(global, 'fetch').mockImplementation(mockFetch);
+  
+    // Define the test inputs
+    const inferenceUrl = 'https://inference-server.com';
+    const requestBody = { message: 'Hello' };
+    const model = { id: 'model-id', parameters: { stream: true } };
+  
+    // Call the function
+    const result = requestInference(inferenceUrl, requestBody, model);
+  
+    // Assert the expected behavior
+    expect(result).toBeInstanceOf(Observable);
+    expect(lastValueFrom(result)).resolves.toEqual('Streamed');
+  });
+
diff --git a/core/src/browser/extensions/engines/index.test.ts b/core/src/browser/extensions/engines/index.test.ts
new file mode 100644
index 000000000..4c0ef11d8
--- /dev/null
+++ b/core/src/browser/extensions/engines/index.test.ts
@@ -0,0 +1,6 @@
+
+import { expect } from '@jest/globals';
+
+it('should re-export all exports from ./AIEngine', () => {
+  expect(require('./index')).toHaveProperty('AIEngine');
+});
diff --git a/core/src/browser/extensions/index.test.ts b/core/src/browser/extensions/index.test.ts
new file mode 100644
index 000000000..26cbda8c5
--- /dev/null
+++ b/core/src/browser/extensions/index.test.ts
@@ -0,0 +1,32 @@
+import { ConversationalExtension } from './index';
+import { InferenceExtension } from './index';
+import { MonitoringExtension } from './index';
+import { AssistantExtension } from './index';
+import { ModelExtension } from './index';
+import * as Engines from './index';
+
+describe('index.ts exports', () => {
+  test('should export ConversationalExtension', () => {
+    expect(ConversationalExtension).toBeDefined();
+  });
+
+  test('should export InferenceExtension', () => {
+    expect(InferenceExtension).toBeDefined();
+  });
+
+  test('should export MonitoringExtension', () => {
+    expect(MonitoringExtension).toBeDefined();
+  });
+
+  test('should export AssistantExtension', () => {
+    expect(AssistantExtension).toBeDefined();
+  });
+
+  test('should export ModelExtension', () => {
+    expect(ModelExtension).toBeDefined();
+  });
+
+  test('should export Engines', () => {
+    expect(Engines).toBeDefined();
+  });
+});
\ No newline at end of file
diff --git a/core/src/browser/fs.test.ts b/core/src/browser/fs.test.ts
new file mode 100644
index 000000000..21da54874
--- /dev/null
+++ b/core/src/browser/fs.test.ts
@@ -0,0 +1,97 @@
+import { fs } from './fs'
+
+describe('fs module', () => {
+  beforeEach(() => {
+    globalThis.core = {
+      api: {
+        writeFileSync: jest.fn(),
+        writeBlob: jest.fn(),
+        readFileSync: jest.fn(),
+        existsSync: jest.fn(),
+        readdirSync: jest.fn(),
+        mkdir: jest.fn(),
+        rm: jest.fn(),
+        unlinkSync: jest.fn(),
+        appendFileSync: jest.fn(),
+        copyFile: jest.fn(),
+        getGgufFiles: jest.fn(),
+        fileStat: jest.fn(),
+      },
+    }
+  })
+
+  it('should call writeFileSync with correct arguments', () => {
+    const args = ['path/to/file', 'data']
+    fs.writeFileSync(...args)
+    expect(globalThis.core.api.writeFileSync).toHaveBeenCalledWith(...args)
+  })
+
+  it('should call writeBlob with correct arguments', async () => {
+    const path = 'path/to/file'
+    const data = 'blob data'
+    await fs.writeBlob(path, data)
+    expect(globalThis.core.api.writeBlob).toHaveBeenCalledWith(path, data)
+  })
+
+  it('should call readFileSync with correct arguments', () => {
+    const args = ['path/to/file']
+    fs.readFileSync(...args)
+    expect(globalThis.core.api.readFileSync).toHaveBeenCalledWith(...args)
+  })
+
+  it('should call existsSync with correct arguments', () => {
+    const args = ['path/to/file']
+    fs.existsSync(...args)
+    expect(globalThis.core.api.existsSync).toHaveBeenCalledWith(...args)
+  })
+
+  it('should call readdirSync with correct arguments', () => {
+    const args = ['path/to/directory']
+    fs.readdirSync(...args)
+    expect(globalThis.core.api.readdirSync).toHaveBeenCalledWith(...args)
+  })
+
+  it('should call mkdir with correct arguments', () => {
+    const args = ['path/to/directory']
+    fs.mkdir(...args)
+    expect(globalThis.core.api.mkdir).toHaveBeenCalledWith(...args)
+  })
+
+  it('should call rm with correct arguments', () => {
+    const args = ['path/to/directory']
+    fs.rm(...args)
+    expect(globalThis.core.api.rm).toHaveBeenCalledWith(...args, { recursive: true, force: true })
+  })
+
+  it('should call unlinkSync with correct arguments', () => {
+    const args = ['path/to/file']
+    fs.unlinkSync(...args)
+    expect(globalThis.core.api.unlinkSync).toHaveBeenCalledWith(...args)
+  })
+
+  it('should call appendFileSync with correct arguments', () => {
+    const args = ['path/to/file', 'data']
+    fs.appendFileSync(...args)
+    expect(globalThis.core.api.appendFileSync).toHaveBeenCalledWith(...args)
+  })
+
+  it('should call copyFile with correct arguments', async () => {
+    const src = 'path/to/src'
+    const dest = 'path/to/dest'
+    await fs.copyFile(src, dest)
+    expect(globalThis.core.api.copyFile).toHaveBeenCalledWith(src, dest)
+  })
+
+  it('should call getGgufFiles with correct arguments', async () => {
+    const paths = ['path/to/file1', 'path/to/file2']
+    await fs.getGgufFiles(paths)
+    expect(globalThis.core.api.getGgufFiles).toHaveBeenCalledWith(paths)
+  })
+
+  it('should call fileStat with correct arguments', async () => {
+    const path = 'path/to/file'
+    const outsideJanDataFolder = true
+    await fs.fileStat(path, outsideJanDataFolder)
+    expect(globalThis.core.api.fileStat).toHaveBeenCalledWith(path, outsideJanDataFolder)
+  })
+})
diff --git a/core/src/browser/tools/tool.test.ts b/core/src/browser/tools/tool.test.ts
new file mode 100644
index 000000000..ba918a3cb
--- /dev/null
+++ b/core/src/browser/tools/tool.test.ts
@@ -0,0 +1,55 @@
+import { ToolManager } from '../../browser/tools/manager'
+import { InferenceTool } from '../../browser/tools/tool'
+import { AssistantTool, MessageRequest } from '../../types'
+
+class MockInferenceTool implements InferenceTool {
+  name = 'mockTool'
+  process(request: MessageRequest, tool: AssistantTool): Promise<MessageRequest> {
+    return Promise.resolve(request)
+  }
+}
+
+it('should register a tool', () => {
+  const manager = new ToolManager()
+  const tool = new MockInferenceTool()
+  manager.register(tool)
+  expect(manager.get(tool.name)).toBe(tool)
+})
+
+it('should retrieve a tool by its name', () => {
+  const manager = new ToolManager()
+  const tool = new MockInferenceTool()
+  manager.register(tool)
+  const retrievedTool = manager.get(tool.name)
+  expect(retrievedTool).toBe(tool)
+})
+
+it('should return undefined for a non-existent tool', () => {
+  const manager = new ToolManager()
+  const retrievedTool = manager.get('nonExistentTool')
+  expect(retrievedTool).toBeUndefined()
+})
+
+it('should process the message request with enabled tools', async () => {
+  const manager = new ToolManager()
+  const tool = new MockInferenceTool()
+  manager.register(tool)
+
+  const request: MessageRequest = { message: 'test' } as any
+  const tools: AssistantTool[] = [{ type: 'mockTool', enabled: true }] as any
+
+  const result = await manager.process(request, tools)
+  expect(result).toBe(request)
+})
+
+it('should skip processing for disabled tools', async () => {
+  const manager = new ToolManager()
+  const tool = new MockInferenceTool()
+  manager.register(tool)
+
+  const request: MessageRequest = { message: 'test' } as any
+  const tools: AssistantTool[] = [{ type: 'mockTool', enabled: false }] as any
+
+  const result = await manager.process(request, tools)
+  expect(result).toBe(request)
+})
\ No newline at end of file
diff --git a/core/src/node/api/processors/processor.test.ts b/core/src/node/api/processors/processor.test.ts
deleted file mode 100644
index e69de29bb..000000000
diff --git a/core/src/node/api/restful/helper/builder.test.ts b/core/src/node/api/restful/helper/builder.test.ts
new file mode 100644
index 000000000..fef40c70a
--- /dev/null
+++ b/core/src/node/api/restful/helper/builder.test.ts
@@ -0,0 +1,264 @@
+import {
+  existsSync,
+  readdirSync,
+  readFileSync,
+  writeFileSync,
+  mkdirSync,
+  appendFileSync,
+  rmdirSync,
+} from 'fs'
+import { join } from 'path'
+import {
+  getBuilder,
+  retrieveBuilder,
+  deleteBuilder,
+  getMessages,
+  retrieveMessage,
+  createThread,
+  updateThread,
+  createMessage,
+  downloadModel,
+  chatCompletions,
+} from './builder'
+import { RouteConfiguration } from './configuration'
+
+jest.mock('fs')
+jest.mock('path')
+jest.mock('../../../helper', () => ({
+  getEngineConfiguration: jest.fn(),
+  getJanDataFolderPath: jest.fn().mockReturnValue('/mock/path'),
+}))
+jest.mock('request')
+jest.mock('request-progress')
+jest.mock('node-fetch')
+
+describe('builder helper functions', () => {
+  const mockConfiguration: RouteConfiguration = {
+    dirName: 'mockDir',
+    metadataFileName: 'metadata.json',
+    delete: {
+      object: 'mockObject',
+    },
+  }
+
+  beforeEach(() => {
+    jest.clearAllMocks()
+  })
+
+  describe('getBuilder', () => {
+    it('should return an empty array if directory does not exist', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(false)
+      const result = await getBuilder(mockConfiguration)
+      expect(result).toEqual([])
+    })
+
+    it('should return model data if directory exists', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['file1'])
+      ;(readFileSync as jest.Mock).mockReturnValue(JSON.stringify({ id: 'model1' }))
+
+      const result = await getBuilder(mockConfiguration)
+      expect(result).toEqual([{ id: 'model1' }])
+    })
+  })
+
+  describe('retrieveBuilder', () => {
+    it('should return undefined if no data matches the id', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['file1'])
+      ;(readFileSync as jest.Mock).mockReturnValue(JSON.stringify({ id: 'model1' }))
+
+      const result = await retrieveBuilder(mockConfiguration, 'nonexistentId')
+      expect(result).toBeUndefined()
+    })
+
+    it('should return the matching data', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['file1'])
+      ;(readFileSync as jest.Mock).mockReturnValue(JSON.stringify({ id: 'model1' }))
+
+      const result = await retrieveBuilder(mockConfiguration, 'model1')
+      expect(result).toEqual({ id: 'model1' })
+    })
+  })
+
+  describe('deleteBuilder', () => {
+    it('should return a message if trying to delete Jan assistant', async () => {
+      const result = await deleteBuilder({ ...mockConfiguration, dirName: 'assistants' }, 'jan')
+      expect(result).toEqual({ message: 'Cannot delete Jan assistant' })
+    })
+
+    it('should return a message if data is not found', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['file1'])
+      ;(readFileSync as jest.Mock).mockReturnValue(JSON.stringify({ id: 'model1' }))
+
+      const result = await deleteBuilder(mockConfiguration, 'nonexistentId')
+      expect(result).toEqual({ message: 'Not found' })
+    })
+
+    it('should delete the directory and return success message', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['file1'])
+      ;(readFileSync as jest.Mock).mockReturnValue(JSON.stringify({ id: 'model1' }))
+
+      const result = await deleteBuilder(mockConfiguration, 'model1')
+      expect(rmdirSync).toHaveBeenCalledWith(join('/mock/path', 'mockDir', 'model1'), {
+        recursive: true,
+      })
+      expect(result).toEqual({ id: 'model1', object: 'mockObject', deleted: true })
+    })
+  })
+
+  describe('getMessages', () => {
+    it('should return an empty array if message file does not exist', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(false)
+
+      const result = await getMessages('thread1')
+      expect(result).toEqual([])
+    })
+
+    it('should return messages if message file exists', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['messages.jsonl'])
+      ;(readFileSync as jest.Mock).mockReturnValue('{"id":"msg1"}\n{"id":"msg2"}\n')
+
+      const result = await getMessages('thread1')
+      expect(result).toEqual([{ id: 'msg1' }, { id: 'msg2' }])
+    })
+  })
+
+  describe('retrieveMessage', () => {
+    it('should return a message if no messages match the id', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['messages.jsonl'])
+      ;(readFileSync as jest.Mock).mockReturnValue('{"id":"msg1"}\n')
+
+      const result = await retrieveMessage('thread1', 'nonexistentId')
+      expect(result).toEqual({ message: 'Not found' })
+    })
+
+    it('should return the matching message', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['messages.jsonl'])
+      ;(readFileSync as jest.Mock).mockReturnValue('{"id":"msg1"}\n')
+
+      const result = await retrieveMessage('thread1', 'msg1')
+      expect(result).toEqual({ id: 'msg1' })
+    })
+  })
+
+  describe('createThread', () => {
+    it('should return a message if thread has no assistants', async () => {
+      const result = await createThread({})
+      expect(result).toEqual({ message: 'Thread must have at least one assistant' })
+    })
+
+    it('should create a thread and return the updated thread', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(false)
+
+      const thread = { assistants: [{ assistant_id: 'assistant1' }] }
+      const result = await createThread(thread)
+      expect(mkdirSync).toHaveBeenCalled()
+      expect(writeFileSync).toHaveBeenCalled()
+      expect(result.id).toBeDefined()
+    })
+  })
+
+  describe('updateThread', () => {
+    it('should return a message if thread is not found', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['file1'])
+      ;(readFileSync as jest.Mock).mockReturnValue(JSON.stringify({ id: 'model1' }))
+
+      const result = await updateThread('nonexistentId', {})
+      expect(result).toEqual({ message: 'Thread not found' })
+    })
+
+    it('should update the thread and return the updated thread', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['file1'])
+      ;(readFileSync as jest.Mock).mockReturnValue(JSON.stringify({ id: 'model1' }))
+
+      const result = await updateThread('model1', { name: 'updatedName' })
+      expect(writeFileSync).toHaveBeenCalled()
+      expect(result.name).toEqual('updatedName')
+    })
+  })
+
+  describe('createMessage', () => {
+    it('should create a message and return the created message', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(false)
+      const message = { role: 'user', content: 'Hello' }
+
+      const result = (await createMessage('thread1', message)) as any
+      expect(mkdirSync).toHaveBeenCalled()
+      expect(appendFileSync).toHaveBeenCalled()
+      expect(result.id).toBeDefined()
+    })
+  })
+
+  describe('downloadModel', () => {
+    it('should return a message if model is not found', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['file1'])
+      ;(readFileSync as jest.Mock).mockReturnValue(JSON.stringify({ id: 'model1' }))
+
+      const result = await downloadModel('nonexistentId')
+      expect(result).toEqual({ message: 'Model not found' })
+    })
+
+    it('should start downloading the model', async () => {
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['file1'])
+      ;(readFileSync as jest.Mock).mockReturnValue(
+        JSON.stringify({ id: 'model1', object: 'model', sources: ['http://example.com'] })
+      )
+      const result = await downloadModel('model1')
+      expect(result).toEqual({ message: 'Starting download model1' })
+    })
+  })
+
+  describe('chatCompletions', () => {
+    it('should return an error if model is not found', async () => {
+      const request = { body: { model: 'nonexistentModel' } }
+      const reply = { code: jest.fn().mockReturnThis(), send: jest.fn() }
+
+      await chatCompletions(request, reply)
+      expect(reply.code).toHaveBeenCalledWith(404)
+      expect(reply.send).toHaveBeenCalledWith({
+        error: {
+          message: 'The model nonexistentModel does not exist',
+          type: 'invalid_request_error',
+          param: null,
+          code: 'model_not_found',
+        },
+      })
+    })
+
+    it('should return the chat completions', async () => {
+      const request = { body: { model: 'model1' } }
+      const reply = {
+        code: jest.fn().mockReturnThis(),
+        send: jest.fn(),
+        raw: { writeHead: jest.fn(), pipe: jest.fn() },
+      }
+
+      ;(existsSync as jest.Mock).mockReturnValue(true)
+      ;(readdirSync as jest.Mock).mockReturnValue(['file1'])
+      ;(readFileSync as jest.Mock).mockReturnValue(
+        JSON.stringify({ id: 'model1', engine: 'openai' })
+      )
+
+      // Mock fetch
+      const fetch = require('node-fetch')
+      fetch.mockResolvedValue({
+        status: 200,
+        body: { pipe: jest.fn() },
+        json: jest.fn().mockResolvedValue({ completions: ['completion1'] }),
+      })
+      await chatCompletions(request, reply)
+      expect(reply.raw.writeHead).toHaveBeenCalledWith(200, expect.any(Object))
+    })
+  })
+})
diff --git a/core/src/node/api/restful/helper/builder.ts b/core/src/node/api/restful/helper/builder.ts
index 08da0ff33..1a8120918 100644
--- a/core/src/node/api/restful/helper/builder.ts
+++ b/core/src/node/api/restful/helper/builder.ts
@@ -280,13 +280,13 @@ export const downloadModel = async (
   for (const source of model.sources) {
     const rq = request({ url: source, strictSSL, proxy })
     progress(rq, {})
-      .on('progress', function (state: any) {
+      ?.on('progress', function (state: any) {
         console.debug('progress', JSON.stringify(state, null, 2))
       })
-      .on('error', function (err: Error) {
+      ?.on('error', function (err: Error) {
         console.error('error', err)
       })
-      .on('end', function () {
+      ?.on('end', function () {
         console.debug('end')
       })
       .pipe(createWriteStream(modelBinaryPath))
diff --git a/core/src/node/api/restful/helper/startStopModel.test.ts b/core/src/node/api/restful/helper/startStopModel.test.ts
new file mode 100644
index 000000000..a5475cc28
--- /dev/null
+++ b/core/src/node/api/restful/helper/startStopModel.test.ts
@@ -0,0 +1,16 @@
+
+
+  import { startModel } from './startStopModel'
+  
+  describe('startModel', () => {
+    it('test_startModel_error', async () => {
+      const modelId = 'testModelId'
+      const settingParams = undefined
+  
+      const result = await startModel(modelId, settingParams)
+  
+      expect(result).toEqual({
+        error: expect.any(Error),
+      })
+    })
+  })
diff --git a/core/src/node/extension/index.test.ts b/core/src/node/extension/index.test.ts
new file mode 100644
index 000000000..ce9cb0d0a
--- /dev/null
+++ b/core/src/node/extension/index.test.ts
@@ -0,0 +1,7 @@
+
+
+    import { useExtensions } from './index'
+    
+    test('testUseExtensionsMissingPath', () => {
+      expect(() => useExtensions(undefined as any)).toThrowError('A path to the extensions folder is required to use extensions')
+    })
diff --git a/core/src/types/api/index.test.ts b/core/src/types/api/index.test.ts
new file mode 100644
index 000000000..6f2f2dcdb
--- /dev/null
+++ b/core/src/types/api/index.test.ts
@@ -0,0 +1,24 @@
+
+
+import { NativeRoute } from '../index';
+
+test('testNativeRouteEnum', () => {
+  expect(NativeRoute.openExternalUrl).toBe('openExternalUrl');
+  expect(NativeRoute.openAppDirectory).toBe('openAppDirectory');
+  expect(NativeRoute.openFileExplore).toBe('openFileExplorer');
+  expect(NativeRoute.selectDirectory).toBe('selectDirectory');
+  expect(NativeRoute.selectFiles).toBe('selectFiles');
+  expect(NativeRoute.relaunch).toBe('relaunch');
+  expect(NativeRoute.setNativeThemeLight).toBe('setNativeThemeLight');
+  expect(NativeRoute.setNativeThemeDark).toBe('setNativeThemeDark');
+  expect(NativeRoute.setMinimizeApp).toBe('setMinimizeApp');
+  expect(NativeRoute.setCloseApp).toBe('setCloseApp');
+  expect(NativeRoute.setMaximizeApp).toBe('setMaximizeApp');
+  expect(NativeRoute.showOpenMenu).toBe('showOpenMenu');
+  expect(NativeRoute.hideQuickAskWindow).toBe('hideQuickAskWindow');
+  expect(NativeRoute.sendQuickAskInput).toBe('sendQuickAskInput');
+  expect(NativeRoute.hideMainWindow).toBe('hideMainWindow');
+  expect(NativeRoute.showMainWindow).toBe('showMainWindow');
+  expect(NativeRoute.quickAskSizeUpdated).toBe('quickAskSizeUpdated');
+  expect(NativeRoute.ackDeepLink).toBe('ackDeepLink');
+});
diff --git a/core/src/types/config/appConfigEvent.test.ts b/core/src/types/config/appConfigEvent.test.ts
new file mode 100644
index 000000000..6000156c7
--- /dev/null
+++ b/core/src/types/config/appConfigEvent.test.ts
@@ -0,0 +1,9 @@
+
+
+  import { AppConfigurationEventName } from './appConfigEvent';
+  
+  describe('AppConfigurationEventName', () => {
+    it('should have the correct value for OnConfigurationUpdate', () => {
+      expect(AppConfigurationEventName.OnConfigurationUpdate).toBe('OnConfigurationUpdate');
+    });
+  });
diff --git a/core/src/types/huggingface/huggingfaceEntity.test.ts b/core/src/types/huggingface/huggingfaceEntity.test.ts
new file mode 100644
index 000000000..d57b484be
--- /dev/null
+++ b/core/src/types/huggingface/huggingfaceEntity.test.ts
@@ -0,0 +1,28 @@
+
+
+  import { AllQuantizations } from './huggingfaceEntity';
+  
+  test('testAllQuantizationsArray', () => {
+    expect(AllQuantizations).toEqual([
+      'Q3_K_S',
+      'Q3_K_M',
+      'Q3_K_L',
+      'Q4_K_S',
+      'Q4_K_M',
+      'Q5_K_S',
+      'Q5_K_M',
+      'Q4_0',
+      'Q4_1',
+      'Q5_0',
+      'Q5_1',
+      'IQ2_XXS',
+      'IQ2_XS',
+      'Q2_K',
+      'Q2_K_S',
+      'Q6_K',
+      'Q8_0',
+      'F16',
+      'F32',
+      'COPY',
+    ]);
+  });
diff --git a/core/src/types/huggingface/index.test.ts b/core/src/types/huggingface/index.test.ts
new file mode 100644
index 000000000..9cb80a08f
--- /dev/null
+++ b/core/src/types/huggingface/index.test.ts
@@ -0,0 +1,8 @@
+
+
+  import * as huggingfaceEntity from './huggingfaceEntity';
+  import * as index from './index';
+  
+  test('test_exports_from_huggingfaceEntity', () => {
+    expect(index).toEqual(huggingfaceEntity);
+  });
diff --git a/core/src/types/index.test.ts b/core/src/types/index.test.ts
new file mode 100644
index 000000000..9dc001c4d
--- /dev/null
+++ b/core/src/types/index.test.ts
@@ -0,0 +1,28 @@
+
+import * as assistant from './assistant';
+import * as model from './model';
+import * as thread from './thread';
+import * as message from './message';
+import * as inference from './inference';
+import * as monitoring from './monitoring';
+import * as file from './file';
+import * as config from './config';
+import * as huggingface from './huggingface';
+import * as miscellaneous from './miscellaneous';
+import * as api from './api';
+import * as setting from './setting';
+
+    test('test_module_exports', () => {
+      expect(assistant).toBeDefined();
+      expect(model).toBeDefined();
+      expect(thread).toBeDefined();
+      expect(message).toBeDefined();
+      expect(inference).toBeDefined();
+      expect(monitoring).toBeDefined();
+      expect(file).toBeDefined();
+      expect(config).toBeDefined();
+      expect(huggingface).toBeDefined();
+      expect(miscellaneous).toBeDefined();
+      expect(api).toBeDefined();
+      expect(setting).toBeDefined();
+    });
diff --git a/core/src/types/inference/inferenceEntity.test.ts b/core/src/types/inference/inferenceEntity.test.ts
new file mode 100644
index 000000000..a2c06e32b
--- /dev/null
+++ b/core/src/types/inference/inferenceEntity.test.ts
@@ -0,0 +1,13 @@
+
+
+  import { ChatCompletionMessage, ChatCompletionRole } from './inferenceEntity';
+  
+  test('test_chatCompletionMessage_withStringContent_andSystemRole', () => {
+    const message: ChatCompletionMessage = {
+      content: 'Hello, world!',
+      role: ChatCompletionRole.System,
+    };
+  
+    expect(message.content).toBe('Hello, world!');
+    expect(message.role).toBe(ChatCompletionRole.System);
+  });
diff --git a/core/src/types/inference/inferenceEvent.test.ts b/core/src/types/inference/inferenceEvent.test.ts
new file mode 100644
index 000000000..1cb44fdbb
--- /dev/null
+++ b/core/src/types/inference/inferenceEvent.test.ts
@@ -0,0 +1,7 @@
+
+
+  import { InferenceEvent } from './inferenceEvent';
+  
+  test('testInferenceEventEnumContainsOnInferenceStopped', () => {
+    expect(InferenceEvent.OnInferenceStopped).toBe('OnInferenceStopped');
+  });
diff --git a/core/src/types/message/messageEvent.test.ts b/core/src/types/message/messageEvent.test.ts
new file mode 100644
index 000000000..80a943bb1
--- /dev/null
+++ b/core/src/types/message/messageEvent.test.ts
@@ -0,0 +1,7 @@
+
+
+    import { MessageEvent } from './messageEvent';
+    
+    test('testOnMessageSentValue', () => {
+      expect(MessageEvent.OnMessageSent).toBe('OnMessageSent');
+    });
diff --git a/core/src/types/message/messageRequestType.test.ts b/core/src/types/message/messageRequestType.test.ts
new file mode 100644
index 000000000..41f53b2e0
--- /dev/null
+++ b/core/src/types/message/messageRequestType.test.ts
@@ -0,0 +1,7 @@
+
+
+  import { MessageRequestType } from './messageRequestType';
+  
+  test('testMessageRequestTypeEnumContainsThread', () => {
+    expect(MessageRequestType.Thread).toBe('Thread');
+  });
diff --git a/core/src/types/model/modelEntity.test.ts b/core/src/types/model/modelEntity.test.ts
new file mode 100644
index 000000000..306316ac4
--- /dev/null
+++ b/core/src/types/model/modelEntity.test.ts
@@ -0,0 +1,30 @@
+
+
+    import { Model, ModelSettingParams, ModelRuntimeParams, InferenceEngine } from '../model'
+    
+    test('testValidModelCreation', () => {
+      const model: Model = {
+        object: 'model',
+        version: '1.0',
+        format: 'format1',
+        sources: [{ filename: 'model.bin', url: 'http://example.com/model.bin' }],
+        id: 'model1',
+        name: 'Test Model',
+        created: Date.now(),
+        description: 'A cool model from Huggingface',
+        settings: { ctx_len: 100, ngl: 50, embedding: true },
+        parameters: { temperature: 0.5, token_limit: 100, top_k: 10 },
+        metadata: { author: 'Author', tags: ['tag1', 'tag2'], size: 100 },
+        engine: InferenceEngine.anthropic
+      };
+    
+      expect(model).toBeDefined();
+      expect(model.object).toBe('model');
+      expect(model.version).toBe('1.0');
+      expect(model.sources).toHaveLength(1);
+      expect(model.sources[0].filename).toBe('model.bin');
+      expect(model.settings).toBeDefined();
+      expect(model.parameters).toBeDefined();
+      expect(model.metadata).toBeDefined();
+      expect(model.engine).toBe(InferenceEngine.anthropic);
+    });
diff --git a/core/src/types/model/modelEvent.test.ts b/core/src/types/model/modelEvent.test.ts
new file mode 100644
index 000000000..f9fa8cc6a
--- /dev/null
+++ b/core/src/types/model/modelEvent.test.ts
@@ -0,0 +1,7 @@
+
+
+    import { ModelEvent } from './modelEvent';
+    
+    test('testOnModelInit', () => {
+      expect(ModelEvent.OnModelInit).toBe('OnModelInit');
+    });
diff --git a/joi/jest.config.js b/joi/jest.config.js
index 8543f24e3..676042491 100644
--- a/joi/jest.config.js
+++ b/joi/jest.config.js
@@ -3,6 +3,7 @@ module.exports = {
   testEnvironment: 'node',
   roots: ['<rootDir>/src'],
   testMatch: ['**/*.test.*'],
+  collectCoverageFrom: ['src/**/*.{ts,tsx}'],
   setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
   testEnvironment: 'jsdom',
 }
diff --git a/package.json b/package.json
index 2785ee3b5..255dda6c7 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
   "scripts": {
     "lint": "yarn workspace jan lint && yarn workspace @janhq/web lint",
     "test:unit": "jest",
-    "test:coverage": "jest --coverage --collectCoverageFrom='src/**/*.{ts,tsx}'",
+    "test:coverage": "jest --coverage",
     "test": "yarn workspace jan test:e2e",
     "test-local": "yarn lint && yarn build:test && yarn test",
     "pre-install:darwin": "find extensions -type f -path \"**/*.tgz\" -exec cp {} pre-install \\;",
diff --git a/testRunner.js b/testRunner.js
new file mode 100644
index 000000000..1067f05a3
--- /dev/null
+++ b/testRunner.js
@@ -0,0 +1,19 @@
+const jestRunner = require('jest-runner')
+
+class EmptyTestFileRunner extends jestRunner.default {
+  async runTests(tests, watcher, onStart, onResult, onFailure, options) {
+    const nonEmptyTests = tests.filter(
+      (test) => test.context.hasteFS.getSize(test.path) > 0
+    )
+    return super.runTests(
+      nonEmptyTests,
+      watcher,
+      onStart,
+      onResult,
+      onFailure,
+      options
+    )
+  }
+}
+
+module.exports = EmptyTestFileRunner
diff --git a/web/containers/Loader/Loader.test.tsx b/web/containers/Loader/Loader.test.tsx
new file mode 100644
index 000000000..007d0eeba
--- /dev/null
+++ b/web/containers/Loader/Loader.test.tsx
@@ -0,0 +1,23 @@
+// Loader.test.tsx
+import '@testing-library/jest-dom';
+import React from 'react'
+import { render, screen } from '@testing-library/react'
+import Loader from './index'
+
+describe('Loader Component', () => {
+  it('renders without crashing', () => {
+    render(<Loader description="Loading..." />)
+  })
+
+  it('displays the correct description', () => {
+    const descriptionText = 'Loading...'
+    render(<Loader description={descriptionText} />)
+    expect(screen.getByText(descriptionText)).toBeInTheDocument()
+  })
+
+  it('renders the correct number of loader elements', () => {
+    const { container } = render(<Loader description="Loading..." />)
+    const loaderElements = container.querySelectorAll('label')
+    expect(loaderElements).toHaveLength(6)
+  })
+})
diff --git a/web/extension/Extension.test.ts b/web/extension/Extension.test.ts
new file mode 100644
index 000000000..d7b4a1805
--- /dev/null
+++ b/web/extension/Extension.test.ts
@@ -0,0 +1,19 @@
+import Extension from "./Extension";
+
+test('should create an Extension instance with all properties', () => {
+  const url = 'https://example.com';
+  const name = 'Test Extension';
+  const productName = 'Test Product';
+  const active = true;
+  const description = 'Test Description';
+  const version = '1.0.0';
+
+  const extension = new Extension(url, name, productName, active, description, version);
+
+  expect(extension.url).toBe(url);
+  expect(extension.name).toBe(name);
+  expect(extension.productName).toBe(productName);
+  expect(extension.active).toBe(active);
+  expect(extension.description).toBe(description);
+  expect(extension.version).toBe(version);
+});
diff --git a/web/extension/Extension.ts b/web/extension/Extension.ts
index 9438238ca..7dfb72b43 100644
--- a/web/extension/Extension.ts
+++ b/web/extension/Extension.ts
@@ -12,13 +12,13 @@ class Extension {
   url: string
 
   /** @type {boolean} Whether the extension is activated or not. */
-  active
+  active?: boolean
 
   /** @type {string} Extension's description. */
-  description
+  description?: string
 
   /** @type {string} Extension's version. */
-  version
+  version?: string
 
   constructor(
     url: string,
diff --git a/web/extension/ExtensionManager.test.ts b/web/extension/ExtensionManager.test.ts
new file mode 100644
index 000000000..58f784b07
--- /dev/null
+++ b/web/extension/ExtensionManager.test.ts
@@ -0,0 +1,131 @@
+// ExtensionManager.test.ts
+import { AIEngine, BaseExtension, ExtensionTypeEnum } from '@janhq/core'
+import { ExtensionManager } from './ExtensionManager'
+import Extension from './Extension'
+
+class TestExtension extends BaseExtension {
+  onLoad(): void {}
+  onUnload(): void {}
+}
+class TestEngine extends AIEngine {
+  provider: string = 'testEngine'
+  onUnload(): void {}
+}
+
+describe('ExtensionManager', () => {
+  let manager: ExtensionManager
+
+  beforeEach(() => {
+    manager = new ExtensionManager()
+  })
+
+  it('should register an extension', () => {
+    const extension = new TestExtension('', '')
+    manager.register('testExtension', extension)
+    expect(manager.getByName('testExtension')).toBe(extension)
+  })
+
+  it('should register an AI engine', () => {
+    const extension = { provider: 'testEngine' } as unknown as BaseExtension
+    manager.register('testExtension', extension)
+    expect(manager.getEngine('testEngine')).toBe(extension)
+  })
+
+  it('should retrieve an extension by type', () => {
+    const extension = new TestExtension('', '')
+    jest.spyOn(extension, 'type').mockReturnValue(ExtensionTypeEnum.Assistant)
+    manager.register('testExtension', extension)
+    expect(manager.get(ExtensionTypeEnum.Assistant)).toBe(extension)
+  })
+
+  it('should retrieve an extension by name', () => {
+    const extension = new TestExtension('', '')
+    manager.register('testExtension', extension)
+    expect(manager.getByName('testExtension')).toBe(extension)
+  })
+
+  it('should retrieve all extensions', () => {
+    const extension1 = new TestExtension('', '')
+    const extension2 = new TestExtension('', '')
+    manager.register('testExtension1', extension1)
+    manager.register('testExtension2', extension2)
+    expect(manager.getAll()).toEqual([extension1, extension2])
+  })
+
+  it('should retrieve an engine by name', () => {
+    const engine = new TestEngine('', '')
+    manager.register('anything', engine)
+    expect(manager.getEngine('testEngine')).toBe(engine)
+  })
+
+  it('should load all extensions', () => {
+    const extension = new TestExtension('', '')
+    jest.spyOn(extension, 'onLoad')
+    manager.register('testExtension', extension)
+    manager.load()
+    expect(extension.onLoad).toHaveBeenCalled()
+  })
+
+  it('should unload all extensions', () => {
+    const extension = new TestExtension('', '')
+    jest.spyOn(extension, 'onUnload')
+    manager.register('testExtension', extension)
+    manager.unload()
+    expect(extension.onUnload).toHaveBeenCalled()
+  })
+
+  it('should list all extensions', () => {
+    const extension1 = new TestExtension('', '')
+    const extension2 = new TestExtension('', '')
+    manager.register('testExtension1', extension1)
+    manager.register('testExtension2', extension2)
+    expect(manager.listExtensions()).toEqual([extension1, extension2])
+  })
+
+  it('should retrieve active extensions', async () => {
+    const extension = new Extension(
+      'url',
+      'name',
+      'productName',
+      true,
+      'description',
+      'version'
+    )
+    window.core = {
+      api: {
+        getActiveExtensions: jest.fn(),
+      },
+    }
+    jest
+      .spyOn(window.core.api, 'getActiveExtensions')
+      .mockResolvedValue([extension])
+    const activeExtensions = await manager.getActive()
+    expect(activeExtensions).toEqual([extension])
+  })
+
+  it('should register all active extensions', async () => {
+    const extension = new Extension(
+      'url',
+      'name',
+      'productName',
+      true,
+      'description',
+      'version'
+    )
+    jest.spyOn(manager, 'getActive').mockResolvedValue([extension])
+    jest.spyOn(manager, 'activateExtension').mockResolvedValue()
+    await manager.registerActive()
+    expect(manager.activateExtension).toHaveBeenCalledWith(extension)
+  })
+
+  it('should uninstall extensions', async () => {
+    window.core = {
+      api: {
+        uninstallExtension: jest.fn(),
+      },
+    }
+    jest.spyOn(window.core.api, 'uninstallExtension').mockResolvedValue(true)
+    const result = await manager.uninstall(['testExtension'])
+    expect(result).toBe(true)
+  })
+})
diff --git a/web/extension/index.test.ts b/web/extension/index.test.ts
new file mode 100644
index 000000000..50b6b59db
--- /dev/null
+++ b/web/extension/index.test.ts
@@ -0,0 +1,9 @@
+
+
+import { extensionManager } from './index';
+
+describe('index', () => {
+  it('should export extensionManager from ExtensionManager', () => {
+    expect(extensionManager).toBeDefined();
+  });
+});
diff --git a/web/helpers/atoms/ApiServer.atom.test.ts b/web/helpers/atoms/ApiServer.atom.test.ts
new file mode 100644
index 000000000..4c5d7fca4
--- /dev/null
+++ b/web/helpers/atoms/ApiServer.atom.test.ts
@@ -0,0 +1,9 @@
+
+import { hostOptions } from './ApiServer.atom';
+
+test('hostOptions correct values', () => {
+  expect(hostOptions).toEqual([
+    { name: '127.0.0.1', value: '127.0.0.1' },
+    { name: '0.0.0.0', value: '0.0.0.0' },
+  ]);
+});
diff --git a/web/helpers/atoms/App.atom.test.ts b/web/helpers/atoms/App.atom.test.ts
new file mode 100644
index 000000000..f3d58dfc1
--- /dev/null
+++ b/web/helpers/atoms/App.atom.test.ts
@@ -0,0 +1,8 @@
+
+import { mainViewStateAtom } from './App.atom';
+import { MainViewState } from '@/constants/screens';
+
+test('mainViewStateAtom initializes with Thread', () => {
+  const result = mainViewStateAtom.init;
+  expect(result).toBe(MainViewState.Thread);
+});
diff --git a/web/helpers/atoms/AppConfig.atom.test.ts b/web/helpers/atoms/AppConfig.atom.test.ts
new file mode 100644
index 000000000..28f085e53
--- /dev/null
+++ b/web/helpers/atoms/AppConfig.atom.test.ts
@@ -0,0 +1,7 @@
+
+import { hostAtom } from './AppConfig.atom';
+
+test('hostAtom default value', () => {
+  const result = hostAtom.init;
+  expect(result).toBe('http://localhost:1337/');
+});
diff --git a/web/helpers/atoms/Assistant.atom.test.ts b/web/helpers/atoms/Assistant.atom.test.ts
new file mode 100644
index 000000000..a5073d293
--- /dev/null
+++ b/web/helpers/atoms/Assistant.atom.test.ts
@@ -0,0 +1,8 @@
+
+import { assistantsAtom } from './Assistant.atom';
+
+test('assistantsAtom initializes as an empty array', () => {
+  const initialValue = assistantsAtom.init;
+  expect(Array.isArray(initialValue)).toBe(true);
+  expect(initialValue).toHaveLength(0);
+});
diff --git a/web/helpers/atoms/ChatMessage.atom.test.ts b/web/helpers/atoms/ChatMessage.atom.test.ts
new file mode 100644
index 000000000..6acf4283e
--- /dev/null
+++ b/web/helpers/atoms/ChatMessage.atom.test.ts
@@ -0,0 +1,32 @@
+
+import { getCurrentChatMessagesAtom } from './ChatMessage.atom';
+import { setConvoMessagesAtom, chatMessages, readyThreadsMessagesAtom } from './ChatMessage.atom';
+
+test('getCurrentChatMessagesAtom returns empty array when no active thread ID', () => {
+  const getMock = jest.fn().mockReturnValue(undefined);
+  expect(getCurrentChatMessagesAtom.read(getMock)).toEqual([]);
+});
+
+
+test('getCurrentChatMessagesAtom returns empty array when activeThreadId is undefined', () => {
+  const getMock = jest.fn().mockReturnValue({
+    activeThreadId: undefined,
+    chatMessages: {
+      threadId: [{ id: 1, content: 'message' }],
+    },
+  });
+  expect(getCurrentChatMessagesAtom.read(getMock)).toEqual([]);
+});
+
+test('setConvoMessagesAtom updates chatMessages and readyThreadsMessagesAtom', () => {
+  const getMock = jest.fn().mockReturnValue({});
+  const setMock = jest.fn();
+  const threadId = 'thread1';
+  const messages = [{ id: '1', content: 'Hello' }];
+
+  setConvoMessagesAtom.write(getMock, setMock, threadId, messages);
+
+  expect(setMock).toHaveBeenCalledWith(chatMessages, { [threadId]: messages });
+  expect(setMock).toHaveBeenCalledWith(readyThreadsMessagesAtom, { [threadId]: true });
+});
+
diff --git a/web/helpers/atoms/HuggingFace.atom.test.ts b/web/helpers/atoms/HuggingFace.atom.test.ts
new file mode 100644
index 000000000..134d19947
--- /dev/null
+++ b/web/helpers/atoms/HuggingFace.atom.test.ts
@@ -0,0 +1,14 @@
+
+import { importHuggingFaceModelStageAtom } from './HuggingFace.atom';
+import { importingHuggingFaceRepoDataAtom } from './HuggingFace.atom';
+
+test('importHuggingFaceModelStageAtom should have initial value of NONE', () => {
+  const result = importHuggingFaceModelStageAtom.init;
+  expect(result).toBe('NONE');
+});
+
+
+test('importingHuggingFaceRepoDataAtom should have initial value of undefined', () => {
+  const result = importingHuggingFaceRepoDataAtom.init;
+  expect(result).toBeUndefined();
+});
diff --git a/web/helpers/atoms/LocalServer.atom.test.ts b/web/helpers/atoms/LocalServer.atom.test.ts
new file mode 100644
index 000000000..b3c53ec07
--- /dev/null
+++ b/web/helpers/atoms/LocalServer.atom.test.ts
@@ -0,0 +1,7 @@
+
+import { serverEnabledAtom } from './LocalServer.atom';
+
+test('serverEnabledAtom_initialValue', () => {
+  const result = serverEnabledAtom.init;
+  expect(result).toBe(false);
+});
diff --git a/web/helpers/atoms/Setting.atom.test.ts b/web/helpers/atoms/Setting.atom.test.ts
new file mode 100644
index 000000000..7c5d7ce94
--- /dev/null
+++ b/web/helpers/atoms/Setting.atom.test.ts
@@ -0,0 +1,7 @@
+
+import { selectedSettingAtom } from './Setting.atom';
+
+test('selectedSettingAtom has correct initial value', () => {
+  const result = selectedSettingAtom.init;
+  expect(result).toBe('My Models');
+});
diff --git a/web/helpers/atoms/ThreadRightPanel.atom.test.ts b/web/helpers/atoms/ThreadRightPanel.atom.test.ts
new file mode 100644
index 000000000..162b059fd
--- /dev/null
+++ b/web/helpers/atoms/ThreadRightPanel.atom.test.ts
@@ -0,0 +1,6 @@
+
+import { activeTabThreadRightPanelAtom } from './ThreadRightPanel.atom';
+
+test('activeTabThreadRightPanelAtom can be imported', () => {
+  expect(activeTabThreadRightPanelAtom).toBeDefined();
+});
diff --git a/web/hooks/useDownloadState.test.ts b/web/hooks/useDownloadState.test.ts
new file mode 100644
index 000000000..893649e26
--- /dev/null
+++ b/web/hooks/useDownloadState.test.ts
@@ -0,0 +1,109 @@
+import {
+  setDownloadStateAtom,
+  modelDownloadStateAtom,
+} from './useDownloadState'
+
+// Mock dependencies
+jest.mock('jotai', () => ({
+  atom: jest.fn(),
+  useAtom: jest.fn(),
+}))
+jest.mock('@/containers/Toast', () => ({
+  toaster: jest.fn(),
+}))
+jest.mock('@/helpers/atoms/Model.atom', () => ({
+  configuredModelsAtom: jest.fn(),
+  downloadedModelsAtom: jest.fn(),
+  removeDownloadingModelAtom: jest.fn(),
+}))
+
+describe('setDownloadStateAtom', () => {
+  let get: jest.Mock
+  let set: jest.Mock
+
+  beforeEach(() => {
+    get = jest.fn()
+    set = jest.fn()
+  })
+
+  it('should handle download completion', () => {
+    const state = {
+      downloadState: 'end',
+      modelId: 'model1',
+      fileName: 'file1',
+      children: [],
+    }
+    const currentState = {
+      model1: {
+        children: [state],
+      },
+    }
+    get.mockReturnValueOnce(currentState)
+    get.mockReturnValueOnce([{ id: 'model1' }])
+
+    set(setDownloadStateAtom, state)
+
+    expect(set).toHaveBeenCalledWith(
+      undefined,
+      expect.objectContaining({ modelId: expect.stringContaining('model1') })
+    )
+  })
+
+  it('should handle download error', () => {
+    const state = {
+      downloadState: 'error',
+      modelId: 'model1',
+      error: 'some error',
+    }
+    const currentState = {
+      model1: {},
+    }
+    get.mockReturnValueOnce(currentState)
+
+    set(setDownloadStateAtom, state)
+
+    expect(set).toHaveBeenCalledWith(
+      undefined,
+      expect.objectContaining({ modelId: 'model1' })
+    )
+  })
+
+  it('should handle download error with certificate issue', () => {
+    const state = {
+      downloadState: 'error',
+      modelId: 'model1',
+      error: 'certificate error',
+    }
+    const currentState = {
+      model1: {},
+    }
+    get.mockReturnValueOnce(currentState)
+
+    set(setDownloadStateAtom, state)
+
+    expect(set).toHaveBeenCalledWith(
+      undefined,
+      expect.objectContaining({ modelId: 'model1' })
+    )
+  })
+
+  it('should handle download in progress', () => {
+    const state = {
+      downloadState: 'progress',
+      modelId: 'model1',
+      fileName: 'file1',
+      size: { total: 100, transferred: 50 },
+    }
+    const currentState = {
+      model1: {
+        children: [],
+        size: { total: 0, transferred: 0 },
+      },
+    }
+    get.mockReturnValueOnce(currentState)
+
+    set(setDownloadStateAtom, state)
+
+    expect(set).toHaveBeenCalledWith(modelDownloadStateAtom, expect.any(Object))
+  })
+})
diff --git a/web/jest.config.js b/web/jest.config.js
index 7601f1e43..8b2683e78 100644
--- a/web/jest.config.js
+++ b/web/jest.config.js
@@ -5,7 +5,6 @@ const createJestConfig = nextJest({})
 
 // Add any custom config to be passed to Jest
 const config = {
-  coverageProvider: 'v8',
   testEnvironment: 'jsdom',
   transform: {
     '^.+\\.(ts|tsx)$': 'ts-jest',
@@ -17,6 +16,8 @@ const config = {
   },
   // Add more setup options before each test is run
   // setupFilesAfterEnv: ['<rootDir>/jest.setup.ts'],
+  runner: './testRunner.js',
+  collectCoverageFrom: ['./**/*.{ts,tsx}'],
 }
 
 // https://stackoverflow.com/a/72926763/5078746
diff --git a/web/screens/Settings/Advanced/index.test.tsx b/web/screens/Settings/Advanced/index.test.tsx
index 10ea810b1..e34626f6e 100644
--- a/web/screens/Settings/Advanced/index.test.tsx
+++ b/web/screens/Settings/Advanced/index.test.tsx
@@ -1,3 +1,7 @@
+/**
+ * @jest-environment jsdom
+ */
+
 import React from 'react'
 import { render, screen, fireEvent, waitFor } from '@testing-library/react'
 import '@testing-library/jest-dom'
@@ -10,7 +14,6 @@ class ResizeObserverMock {
 }
 
 global.ResizeObserver = ResizeObserverMock
-// @ts-ignore
 global.window.core = {
   api: {
     getAppConfigurations: () => jest.fn(),
diff --git a/web/services/appService.test.ts b/web/services/appService.test.ts
new file mode 100644
index 000000000..37053f930
--- /dev/null
+++ b/web/services/appService.test.ts
@@ -0,0 +1,30 @@
+
+import { ExtensionTypeEnum, extensionManager } from '@/extension';
+import { appService } from './appService';
+
+test('should return correct system information when monitoring extension is found', async () => {
+  const mockGpuSetting = { name: 'NVIDIA GeForce GTX 1080', memory: 8192 };
+  const mockOsInfo = { platform: 'win32', release: '10.0.19041' };
+  const mockMonitoringExtension = {
+    getGpuSetting: jest.fn().mockResolvedValue(mockGpuSetting),
+    getOsInfo: jest.fn().mockResolvedValue(mockOsInfo),
+  };
+  extensionManager.get = jest.fn().mockReturnValue(mockMonitoringExtension);
+  
+  const result = await appService.systemInformation();
+  
+  expect(mockMonitoringExtension.getGpuSetting).toHaveBeenCalled();
+  expect(mockMonitoringExtension.getOsInfo).toHaveBeenCalled();
+  expect(result).toEqual({ gpuSetting: mockGpuSetting, osInfo: mockOsInfo });
+});
+
+
+test('should log a warning when monitoring extension is not found', async () => {
+  const consoleWarnMock = jest.spyOn(console, 'warn').mockImplementation(() => {});
+  extensionManager.get = jest.fn().mockReturnValue(undefined);
+  
+  await appService.systemInformation();
+  
+  expect(consoleWarnMock).toHaveBeenCalledWith('System monitoring extension not found');
+  consoleWarnMock.mockRestore();
+});
diff --git a/web/services/eventsService.test.ts b/web/services/eventsService.test.ts
new file mode 100644
index 000000000..78b95167a
--- /dev/null
+++ b/web/services/eventsService.test.ts
@@ -0,0 +1,47 @@
+
+import { EventEmitter } from './eventsService';
+
+test('should do nothing when no handlers for event', () => {
+  const emitter = new EventEmitter();
+  
+  expect(() => {
+    emitter.emit('nonExistentEvent', 'test data');
+  }).not.toThrow();
+});
+
+
+test('should call all handlers for event', () => {
+  const emitter = new EventEmitter();
+  const handler1 = jest.fn();
+  const handler2 = jest.fn();
+  
+  emitter.on('testEvent', handler1);
+  emitter.on('testEvent', handler2);
+  
+  emitter.emit('testEvent', 'test data');
+  
+  expect(handler1).toHaveBeenCalledWith('test data');
+  expect(handler2).toHaveBeenCalledWith('test data');
+});
+
+
+test('should remove handler for event', () => {
+  const emitter = new EventEmitter();
+  const handler = jest.fn();
+  
+  emitter.on('testEvent', handler);
+  emitter.off('testEvent', handler);
+  
+  expect(emitter['handlers'].get('testEvent')).not.toContain(handler);
+});
+
+
+test('should add handler for event', () => {
+  const emitter = new EventEmitter();
+  const handler = jest.fn();
+  
+  emitter.on('testEvent', handler);
+  
+  expect(emitter['handlers'].has('testEvent')).toBe(true);
+  expect(emitter['handlers'].get('testEvent')).toContain(handler);
+});
diff --git a/web/services/extensionService.test.ts b/web/services/extensionService.test.ts
new file mode 100644
index 000000000..75bd4f78a
--- /dev/null
+++ b/web/services/extensionService.test.ts
@@ -0,0 +1,35 @@
+
+import { extensionManager } from '@/extension/ExtensionManager';
+import { ExtensionTypeEnum } from '@janhq/core';
+import { isCoreExtensionInstalled } from './extensionService';
+
+test('isCoreExtensionInstalled returns true when both extensions are installed', () => {
+  jest.spyOn(extensionManager, 'get').mockImplementation((type) => {
+    if (type === ExtensionTypeEnum.Conversational || type === ExtensionTypeEnum.Model) return {};
+    return undefined;
+  });
+  
+  expect(isCoreExtensionInstalled()).toBe(true);
+});
+
+
+test('isCoreExtensionInstalled returns false when Model extension is not installed', () => {
+  jest.spyOn(extensionManager, 'get').mockImplementation((type) => {
+    if (type === ExtensionTypeEnum.Conversational) return {};
+    if (type === ExtensionTypeEnum.Model) return undefined;
+    return undefined;
+  });
+  
+  expect(isCoreExtensionInstalled()).toBe(false);
+});
+
+
+test('isCoreExtensionInstalled returns false when Conversational extension is not installed', () => {
+  jest.spyOn(extensionManager, 'get').mockImplementation((type) => {
+    if (type === ExtensionTypeEnum.Conversational) return undefined;
+    if (type === ExtensionTypeEnum.Model) return {};
+    return undefined;
+  });
+  
+  expect(isCoreExtensionInstalled()).toBe(false);
+});
diff --git a/web/services/restService.test.ts b/web/services/restService.test.ts
new file mode 100644
index 000000000..7782e7816
--- /dev/null
+++ b/web/services/restService.test.ts
@@ -0,0 +1,15 @@
+
+
+test('restAPI.baseApiUrl set correctly', () => {
+  const originalEnv = process.env.API_BASE_URL;
+  process.env.API_BASE_URL = 'http://test-api.com';
+  
+  // Re-import to get the updated value
+  jest.resetModules();
+  const { restAPI } = require('./restService');
+
+  expect(restAPI.baseApiUrl).toBe('http://test-api.com');
+
+  // Clean up
+  process.env.API_BASE_URL = originalEnv;
+});
diff --git a/web/utils/json.test.ts b/web/utils/json.test.ts
new file mode 100644
index 000000000..47a37d5fd
--- /dev/null
+++ b/web/utils/json.test.ts
@@ -0,0 +1,22 @@
+// json.test.ts
+import { safeJsonParse } from './json';
+
+describe('safeJsonParse', () => {
+  it('should correctly parse a valid JSON string', () => {
+    const jsonString = '{"name": "John", "age": 30}';
+    const result = safeJsonParse<{ name: string; age: number }>(jsonString);
+    expect(result).toEqual({ name: 'John', age: 30 });
+  });
+
+  it('should return undefined for an invalid JSON string', () => {
+    const jsonString = '{"name": "John", "age": 30';
+    const result = safeJsonParse<{ name: string; age: number }>(jsonString);
+    expect(result).toBeUndefined();
+  });
+
+  it('should return undefined for an empty string', () => {
+    const jsonString = '';
+    const result = safeJsonParse<unknown>(jsonString);
+    expect(result).toBeUndefined();
+  });
+});
\ No newline at end of file
diff --git a/web/utils/modelParam.test.ts b/web/utils/modelParam.test.ts
index f1b858955..994a5bd57 100644
--- a/web/utils/modelParam.test.ts
+++ b/web/utils/modelParam.test.ts
@@ -149,6 +149,14 @@ describe('validationRules', () => {
   })
 })
 
+
+  it('should normalize invalid values for keys not listed in validationRules', () => {
+    expect(normalizeValue('invalid_key', 'invalid')).toBe('invalid')
+    expect(normalizeValue('invalid_key', 123)).toBe(123)
+    expect(normalizeValue('invalid_key', true)).toBe(true)
+    expect(normalizeValue('invalid_key', false)).toBe(false)
+  })
+
 describe('normalizeValue', () => {
   it('should normalize ctx_len correctly', () => {
     expect(normalizeValue('ctx_len', 100.5)).toBe(100)
diff --git a/web/utils/threadMessageBuilder.test.ts b/web/utils/threadMessageBuilder.test.ts
new file mode 100644
index 000000000..d938a2e03
--- /dev/null
+++ b/web/utils/threadMessageBuilder.test.ts
@@ -0,0 +1,27 @@
+
+import { ChatCompletionRole, MessageStatus } from '@janhq/core'
+
+  import { ThreadMessageBuilder } from './threadMessageBuilder'
+  import { MessageRequestBuilder } from './messageRequestBuilder'
+  
+  describe('ThreadMessageBuilder', () => {
+    it('testBuildMethod', () => {
+      const msgRequest = new MessageRequestBuilder(
+        'type',
+        { model: 'model' },
+        { id: 'thread-id' },
+        []
+      )
+      const builder = new ThreadMessageBuilder(msgRequest)
+      const result = builder.build()
+  
+      expect(result.id).toBe(msgRequest.msgId)
+      expect(result.thread_id).toBe(msgRequest.thread.id)
+      expect(result.role).toBe(ChatCompletionRole.User)
+      expect(result.status).toBe(MessageStatus.Ready)
+      expect(result.created).toBeDefined()
+      expect(result.updated).toBeDefined()
+      expect(result.object).toBe('thread.message')
+      expect(result.content).toEqual([])
+    })
+  })