diff --git a/.github/workflows/copilot.yml b/.github/workflows/copilot.yml
index c34dcb11..38c24378 100644
--- a/.github/workflows/copilot.yml
+++ b/.github/workflows/copilot.yml
@@ -9,7 +9,9 @@ on:
 env:
     GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-permissions: write-all
+permissions:
+  contents: read
+  pull-requests: write
 
 jobs:
   review:
diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
index 20d9e55f..0646eab5 100644
--- a/.github/workflows/unittest.yml
+++ b/.github/workflows/unittest.yml
@@ -16,4 +16,4 @@ jobs:
     - name: Install requirements
       run: pip install -r requirements.txt
     - name: Run tests
-      run: python -m etc.unittest.main
\ No newline at end of file
+      run: python -m etc.unittest
\ No newline at end of file
diff --git a/etc/unittest/__main__.py b/etc/unittest/__main__.py
new file mode 100644
index 00000000..243c56b2
--- /dev/null
+++ b/etc/unittest/__main__.py
@@ -0,0 +1,6 @@
+import unittest
+from .asyncio import *
+from .backend import *
+from .main import *
+
+unittest.main()
\ No newline at end of file
diff --git a/etc/unittest/asyncio.py b/etc/unittest/asyncio.py
new file mode 100644
index 00000000..74e29986
--- /dev/null
+++ b/etc/unittest/asyncio.py
@@ -0,0 +1,57 @@
+from .include import DEFAULT_MESSAGES
+import asyncio
+import nest_asyncio
+import unittest
+import g4f
+from g4f import ChatCompletion
+from .mocks import ProviderMock, AsyncProviderMock, AsyncGeneratorProviderMock
+        
+class TestChatCompletion(unittest.TestCase):
+    
+    async def run_exception(self):
+        return ChatCompletion.create(g4f.models.default, DEFAULT_MESSAGES, AsyncProviderMock)
+        
+    def test_exception(self):
+        self.assertRaises(g4f.errors.NestAsyncioError, asyncio.run, self.run_exception())
+
+    def test_create(self):
+        result = ChatCompletion.create(g4f.models.default, DEFAULT_MESSAGES, AsyncProviderMock)
+        self.assertEqual("Mock",result)
+        
+    def test_create_generator(self):
+        result = ChatCompletion.create(g4f.models.default, DEFAULT_MESSAGES, AsyncGeneratorProviderMock)
+        self.assertEqual("Mock",result)
+
+class TestChatCompletionAsync(unittest.IsolatedAsyncioTestCase):
+    
+    async def test_base(self):
+        result = await ChatCompletion.create_async(g4f.models.default, DEFAULT_MESSAGES, ProviderMock)
+        self.assertEqual("Mock",result)
+        
+    async def test_async(self):
+        result = await ChatCompletion.create_async(g4f.models.default, DEFAULT_MESSAGES, AsyncProviderMock)
+        self.assertEqual("Mock",result)
+        
+    async def test_create_generator(self):
+        result = await ChatCompletion.create_async(g4f.models.default, DEFAULT_MESSAGES, AsyncGeneratorProviderMock)
+        self.assertEqual("Mock",result)
+        
+class TestChatCompletionNestAsync(unittest.IsolatedAsyncioTestCase):
+        
+    def setUp(self) -> None:
+        nest_asyncio.apply()
+        
+    async def test_create(self):
+        result = await ChatCompletion.create_async(g4f.models.default, DEFAULT_MESSAGES, ProviderMock)
+        self.assertEqual("Mock",result)
+        
+    async def test_nested(self):
+        result = ChatCompletion.create(g4f.models.default, DEFAULT_MESSAGES, AsyncProviderMock)
+        self.assertEqual("Mock",result)
+        
+    async def test_nested_generator(self):
+        result = ChatCompletion.create(g4f.models.default, DEFAULT_MESSAGES, AsyncGeneratorProviderMock)
+        self.assertEqual("Mock",result)
+
+if __name__ == '__main__':
+    unittest.main()
\ No newline at end of file
diff --git a/etc/unittest/backend.py b/etc/unittest/backend.py
new file mode 100644
index 00000000..f5961e2d
--- /dev/null
+++ b/etc/unittest/backend.py
@@ -0,0 +1,38 @@
+from . import include
+import unittest
+from unittest.mock import MagicMock
+from .mocks import ProviderMock
+import g4f
+from g4f.gui.server.backend import Backend_Api, get_error_message
+        
+class TestBackendApi(unittest.TestCase):
+
+    def setUp(self):
+        self.app = MagicMock()
+        self.api = Backend_Api(self.app)
+
+    def test_version(self):
+        response = self.api.get_version()
+        self.assertIn("version", response)
+        self.assertIn("latest_version", response)
+        
+    def test_get_models(self):
+        response = self.api.get_models()
+        self.assertIsInstance(response, list)
+        self.assertTrue(len(response) > 0)
+        
+    def test_get_providers(self):
+        response = self.api.get_providers()
+        self.assertIsInstance(response, list)
+        self.assertTrue(len(response) > 0)
+        
+class TestUtilityFunctions(unittest.TestCase):
+
+    def test_get_error_message(self):
+        g4f.debug.last_provider = ProviderMock
+        exception = Exception("Message")
+        result = get_error_message(exception)
+        self.assertEqual("ProviderMock: Exception: Message", result)
+        
+if __name__ == '__main__':
+    unittest.main()
\ No newline at end of file
diff --git a/etc/unittest/include.py b/etc/unittest/include.py
new file mode 100644
index 00000000..e67fd5a7
--- /dev/null
+++ b/etc/unittest/include.py
@@ -0,0 +1,11 @@
+import sys
+import pathlib
+
+sys.path.append(str(pathlib.Path(__file__).parent.parent.parent))
+
+import g4f
+
+g4f.debug.logging = False
+g4f.debug.version_check = False
+
+DEFAULT_MESSAGES = [{'role': 'user', 'content': 'Hello'}]
\ No newline at end of file
diff --git a/etc/unittest/main.py b/etc/unittest/main.py
index ad1fe02d..5a220323 100644
--- a/etc/unittest/main.py
+++ b/etc/unittest/main.py
@@ -1,75 +1,37 @@
-import sys
-import pathlib
+from .include import DEFAULT_MESSAGES
 import unittest
-from unittest.mock import MagicMock
-
-sys.path.append(str(pathlib.Path(__file__).parent.parent.parent))
-
+import asyncio
 import g4f
 from g4f import ChatCompletion, get_last_provider
-from g4f.gui.server.backend import Backend_Api, get_error_message
-from g4f.base_provider import BaseProvider
-
-g4f.debug.logging = False
-g4f.debug.version_check = False
-
-class MockProvider(BaseProvider):
-    working = True
-
-    def create_completion(
-        model, messages, stream, **kwargs
-    ):
-        yield "Mock"
-
-    async def create_async(
-        model, messages, **kwargs
-    ):
-        return "Mock"
-
-class TestBackendApi(unittest.TestCase):
-
-    def setUp(self):
-        self.app = MagicMock()
-        self.api = Backend_Api(self.app)
-
-    def test_version(self):
-        response = self.api.get_version()
-        self.assertIn("version", response)
-        self.assertIn("latest_version", response)
+from g4f.Provider import RetryProvider
+from .mocks import ProviderMock
 
 class TestChatCompletion(unittest.TestCase):
 
     def test_create_default(self):
-        messages = [{'role': 'user', 'content': 'Hello'}]
-        result = ChatCompletion.create(g4f.models.default, messages)
+        result = ChatCompletion.create(g4f.models.default, DEFAULT_MESSAGES)
         if "Good" not in result and "Hi" not in result:
             self.assertIn("Hello", result)
-        
-    def test_get_last_provider(self):
-        messages = [{'role': 'user', 'content': 'Hello'}]
-        ChatCompletion.create(g4f.models.default, messages, MockProvider)
-        self.assertEqual(get_last_provider(), MockProvider)
-        
+
     def test_bing_provider(self):
-        messages = [{'role': 'user', 'content': 'Hello'}]
         provider = g4f.Provider.Bing
-        result = ChatCompletion.create(g4f.models.default, messages, provider)
+        result = ChatCompletion.create(g4f.models.default, DEFAULT_MESSAGES, provider)
         self.assertIn("Bing", result)
 
-class TestChatCompletionAsync(unittest.IsolatedAsyncioTestCase):
-    
-    async def test_async(self):
-        messages = [{'role': 'user', 'content': 'Hello'}]
-        result = await ChatCompletion.create_async(g4f.models.default, messages, MockProvider)
-        self.assertEqual("Mock", result)
+class TestGetLastProvider(unittest.TestCase):
 
-class TestUtilityFunctions(unittest.TestCase):
-
-    def test_get_error_message(self):
-        g4f.debug.last_provider = g4f.Provider.Bing
-        exception = Exception("Message")
-        result = get_error_message(exception)
-        self.assertEqual("Bing: Exception: Message", result)
+    def test_get_last_provider(self):
+        ChatCompletion.create(g4f.models.default, DEFAULT_MESSAGES, ProviderMock)
+        self.assertEqual(get_last_provider(), ProviderMock)
+        
+    def test_get_last_provider_retry(self):
+        ChatCompletion.create(g4f.models.default, DEFAULT_MESSAGES, RetryProvider([ProviderMock]))
+        self.assertEqual(get_last_provider(), ProviderMock)
+        
+    def test_get_last_provider_async(self):
+        coroutine = ChatCompletion.create_async(g4f.models.default, DEFAULT_MESSAGES, ProviderMock)
+        asyncio.run(coroutine)
+        self.assertEqual(get_last_provider(), ProviderMock)
 
 if __name__ == '__main__':
     unittest.main()
\ No newline at end of file
diff --git a/etc/unittest/mocks.py b/etc/unittest/mocks.py
new file mode 100644
index 00000000..a9505997
--- /dev/null
+++ b/etc/unittest/mocks.py
@@ -0,0 +1,25 @@
+from g4f.Provider.base_provider import AbstractProvider, AsyncProvider, AsyncGeneratorProvider
+
+class ProviderMock(AbstractProvider):
+    working = True
+
+    def create_completion(
+        model, messages, stream, **kwargs
+    ):
+        yield "Mock"
+        
+class AsyncProviderMock(AsyncProvider):
+    working = True
+    
+    async def create_async(
+        model, messages, **kwargs
+    ):
+        return "Mock"
+
+class AsyncGeneratorProviderMock(AsyncGeneratorProvider):
+    working = True
+    
+    async def create_async_generator(
+        model, messages, stream, **kwargs
+    ):
+        yield "Mock"
\ No newline at end of file
diff --git a/g4f/Provider/Bing.py b/g4f/Provider/Bing.py
index 34687866..b869a6ef 100644
--- a/g4f/Provider/Bing.py
+++ b/g4f/Provider/Bing.py
@@ -64,12 +64,7 @@ class Bing(AsyncGeneratorProvider):
             prompt = messages[-1]["content"]
             context = create_context(messages[:-1])
         
-        if not cookies:
-            cookies = Defaults.cookies
-        else:
-            for key, value in Defaults.cookies.items():
-                if key not in cookies:
-                    cookies[key] = value
+        cookies = {**Defaults.cookies, **cookies} if cookies else Defaults.cookies
 
         gpt4_turbo = True if model.startswith("gpt-4-turbo") else False
 
@@ -207,10 +202,12 @@ def create_message(
     request_id = str(uuid.uuid4())
     struct = {
         'arguments': [{
-            'source': 'cib', 'optionsSets': options_sets,
+            'source': 'cib',
+            'optionsSets': options_sets,
             'allowedMessageTypes': Defaults.allowedMessageTypes,
             'sliceIds': Defaults.sliceIds,
-            'traceId': os.urandom(16).hex(), 'isStartOfSession': True,
+            'traceId': os.urandom(16).hex(),
+            'isStartOfSession': True,
             'requestId': request_id,
             'message': {
                 **Defaults.location,
diff --git a/g4f/Provider/base_provider.py b/g4f/Provider/base_provider.py
index 95f1b0b2..bc47a1fa 100644
--- a/g4f/Provider/base_provider.py
+++ b/g4f/Provider/base_provider.py
@@ -5,8 +5,8 @@ from asyncio import AbstractEventLoop
 from concurrent.futures import ThreadPoolExecutor
 from abc import abstractmethod
 from inspect import signature, Parameter
-from .helper import get_event_loop, get_cookies, format_prompt
-from ..typing import CreateResult, AsyncResult, Messages
+from .helper import get_cookies, format_prompt
+from ..typing import CreateResult, AsyncResult, Messages, Union
 from ..base_provider import BaseProvider
 from ..errors import NestAsyncioError
 
@@ -20,6 +20,17 @@ if sys.platform == 'win32':
     if isinstance(asyncio.get_event_loop_policy(), asyncio.WindowsProactorEventLoopPolicy):
         asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
 
+def get_running_loop() -> Union[AbstractEventLoop, None]:
+    try:
+        loop = asyncio.get_running_loop()
+        if not hasattr(loop.__class__, "_nest_patched"):
+            raise NestAsyncioError(
+                'Use "create_async" instead of "create" function in a running event loop. Or use "nest_asyncio" package.'
+            )
+        return loop
+    except RuntimeError:
+        pass
+
 class AbstractProvider(BaseProvider):
     """
     Abstract class for providing asynchronous functionality to derived classes.
@@ -56,7 +67,7 @@ class AbstractProvider(BaseProvider):
 
         return await asyncio.wait_for(
             loop.run_in_executor(executor, create_func),
-            timeout=kwargs.get("timeout", 0)
+            timeout=kwargs.get("timeout")
         )
     
     @classmethod
@@ -118,14 +129,7 @@ class AsyncProvider(AbstractProvider):
         Returns:
             CreateResult: The result of the completion creation.
         """
-        try:
-            loop = asyncio.get_running_loop()
-            if not hasattr(loop.__class__, "_nest_patched"):
-                raise NestAsyncioError(
-                    'Use "create_async" instead of "create" function in a running event loop. Or use "nest_asyncio" package.'
-                )
-        except RuntimeError:
-            pass
+        get_running_loop()
         yield asyncio.run(cls.create_async(model, messages, **kwargs))
 
     @staticmethod
@@ -180,15 +184,12 @@ class AsyncGeneratorProvider(AsyncProvider):
         Returns:
             CreateResult: The result of the streaming completion creation.
         """
-        try:
-            loop = asyncio.get_running_loop()
-            if not hasattr(loop.__class__, "_nest_patched"):
-                raise NestAsyncioError(
-                    'Use "create_async" instead of "create" function in a running event loop. Or use "nest_asyncio" package.'
-                )
-        except RuntimeError:
+        loop = get_running_loop()
+        new_loop = False
+        if not loop:
             loop = asyncio.new_event_loop()
             asyncio.set_event_loop(loop)
+            new_loop = True
 
         generator = cls.create_async_generator(model, messages, stream=stream, **kwargs)
         gen = generator.__aiter__()
@@ -199,6 +200,10 @@ class AsyncGeneratorProvider(AsyncProvider):
             except StopAsyncIteration:
                 break
 
+        if new_loop:
+            loop.close()
+            asyncio.set_event_loop(None)
+
     @classmethod
     async def create_async(
         cls,
diff --git a/g4f/gui/server/backend.py b/g4f/gui/server/backend.py
index b4c8f56c..d5c59ed1 100644
--- a/g4f/gui/server/backend.py
+++ b/g4f/gui/server/backend.py
@@ -2,7 +2,7 @@ import logging
 import json
 from flask import request, Flask
 from typing import Generator
-from g4f import debug, version, models
+from g4f import version, models
 from g4f import _all_models, get_last_provider, ChatCompletion
 from g4f.image import is_allowed_extension, to_image
 from g4f.errors import VersionNotFoundError
@@ -10,7 +10,6 @@ from g4f.Provider import __providers__
 from g4f.Provider.bing.create_images import patch_provider
 from .internet import get_search_message
 
-debug.logging = True
 
 class Backend_Api:
     """
diff --git a/g4f/image.py b/g4f/image.py
index cfa22ab1..24ded915 100644
--- a/g4f/image.py
+++ b/g4f/image.py
@@ -112,7 +112,7 @@ def get_orientation(image: Image.Image) -> int:
     """
     exif_data = image.getexif() if hasattr(image, 'getexif') else image._getexif()
     if exif_data is not None:
-        orientation = exif_data.get(274)  # 274 corresponds to the orientation tag in EXIF
+        orientation = exif_data.get(274) # 274 corresponds to the orientation tag in EXIF
         if orientation is not None:
             return orientation
 
@@ -156,23 +156,23 @@ def to_base64(image: Image.Image, compression_rate: float) -> str:
     image.save(output_buffer, format="JPEG", quality=int(compression_rate * 100))
     return base64.b64encode(output_buffer.getvalue()).decode()
 
-def format_images_markdown(images, prompt: str, preview: str="{image}?w=200&h=200") -> str:
+def format_images_markdown(images, alt: str, preview: str="{image}?w=200&h=200") -> str:
     """
     Formats the given images as a markdown string.
 
     Args:
         images: The images to format.
-        prompt (str): The prompt for the images.
+        alt (str): The alt for the images.
         preview (str, optional): The preview URL format. Defaults to "{image}?w=200&h=200".
 
     Returns:
         str: The formatted markdown string.
     """
-    if isinstance(images, list):
-        images = [f"[![#{idx+1} {prompt}]({preview.replace('{image}', image)})]({image})" for idx, image in enumerate(images)]
-        images = "\n".join(images)
+    if isinstance(images, str):
+        images = f"[![{alt}]({preview.replace('{image}', images)})]({images})"
     else:
-        images = f"[![{prompt}]({images})]({images})"
+        images = [f"[![#{idx+1} {alt}]({preview.replace('{image}', image)})]({image})" for idx, image in enumerate(images)]
+        images = "\n".join(images)
     start_flag = "<!-- generated images start -->\n"
     end_flag = "<!-- generated images end -->\n"
     return f"\n{start_flag}{images}\n{end_flag}\n"
diff --git a/g4f/typing.py b/g4f/typing.py
index c972f505..a6a62e3f 100644
--- a/g4f/typing.py
+++ b/g4f/typing.py
@@ -18,7 +18,14 @@ __all__ = [
     'AsyncGenerator',
     'Generator',
     'Tuple',
+    'Union',
+    'List',
+    'Dict',
+    'Type',
     'TypedDict',
     'SHA256',
     'CreateResult',
+    'AsyncResult',
+    'Messages',
+    'ImageType'
 ]