diff --git a/tests/test_litellm/enterprise/enterprise_callbacks/send_emails/test_resend_email.py b/tests/test_litellm/enterprise/enterprise_callbacks/send_emails/test_resend_email.py
index 8db6d98f13d..1a9bb04dd61 100644
--- a/tests/test_litellm/enterprise/enterprise_callbacks/send_emails/test_resend_email.py
+++ b/tests/test_litellm/enterprise/enterprise_callbacks/send_emails/test_resend_email.py
@@ -9,6 +9,7 @@
 
 sys.path.insert(0, os.path.abspath("../../.."))
 
+import litellm
 from litellm_enterprise.enterprise_callbacks.send_emails.resend_email import (
     ResendEmailLogger,
 )
@@ -16,6 +17,30 @@
 # Test file for Resend email integration
 
 
+@pytest.fixture(autouse=True)
+def disable_aiohttp_transport():
+    """
+    Disable aiohttp transport so respx can intercept httpx requests.
+    Also clear the client cache to ensure fresh clients are created.
+    """
+    # Disable aiohttp transport so respx can intercept requests
+    original_value = getattr(litellm, "disable_aiohttp_transport", None)
+    litellm.disable_aiohttp_transport = True
+    
+    # Clear the client cache to ensure we don't reuse old clients
+    cache = getattr(litellm, "in_memory_llm_clients_cache", None)
+    if cache is not None:
+        cache.flush_cache()
+    
+    yield
+    
+    # Restore original value
+    if original_value is not None:
+        litellm.disable_aiohttp_transport = original_value
+    elif hasattr(litellm, "disable_aiohttp_transport"):
+        delattr(litellm, "disable_aiohttp_transport")
+
+
 @pytest.fixture
 def mock_env_vars():
     with mock.patch.dict(os.environ, {"RESEND_API_KEY": "test_api_key"}):
diff --git a/tests/test_litellm/enterprise/enterprise_callbacks/send_emails/test_sendgrid_email.py b/tests/test_litellm/enterprise/enterprise_callbacks/send_emails/test_sendgrid_email.py
index 836b717bd6e..97091183239 100644
--- a/tests/test_litellm/enterprise/enterprise_callbacks/send_emails/test_sendgrid_email.py
+++ b/tests/test_litellm/enterprise/enterprise_callbacks/send_emails/test_sendgrid_email.py
@@ -9,11 +9,36 @@
 
 sys.path.insert(0, os.path.abspath("../../.."))
 
+import litellm
 from litellm_enterprise.enterprise_callbacks.send_emails.sendgrid_email import (
     SendGridEmailLogger,
 )
 
 
+@pytest.fixture(autouse=True)
+def disable_aiohttp_transport():
+    """
+    Disable aiohttp transport so respx can intercept httpx requests.
+    Also clear the client cache to ensure fresh clients are created.
+    """
+    # Disable aiohttp transport so respx can intercept requests
+    original_value = getattr(litellm, "disable_aiohttp_transport", None)
+    litellm.disable_aiohttp_transport = True
+    
+    # Clear the client cache to ensure we don't reuse old clients
+    cache = getattr(litellm, "in_memory_llm_clients_cache", None)
+    if cache is not None:
+        cache.flush_cache()
+    
+    yield
+    
+    # Restore original value
+    if original_value is not None:
+        litellm.disable_aiohttp_transport = original_value
+    elif hasattr(litellm, "disable_aiohttp_transport"):
+        delattr(litellm, "disable_aiohttp_transport")
+
+
 @pytest.fixture
 def mock_env_vars():
     # Store original values
diff --git a/tests/test_litellm/test_main.py b/tests/test_litellm/test_main.py
index 80fd9f61298..f32f454eb0f 100644
--- a/tests/test_litellm/test_main.py
+++ b/tests/test_litellm/test_main.py
@@ -18,6 +18,27 @@
 from litellm import main as litellm_main
 
 
+@pytest.fixture(autouse=True)
+def disable_aiohttp_transport():
+    """
+    Disable aiohttp transport so respx can intercept httpx requests.
+    Also clear the client cache to ensure fresh clients are created.
+    """
+    original_value = getattr(litellm, "disable_aiohttp_transport", None)
+    litellm.disable_aiohttp_transport = True
+    
+    cache = getattr(litellm, "in_memory_llm_clients_cache", None)
+    if cache is not None:
+        cache.flush_cache()
+    
+    yield
+    
+    if original_value is not None:
+        litellm.disable_aiohttp_transport = original_value
+    elif hasattr(litellm, "disable_aiohttp_transport"):
+        delattr(litellm, "disable_aiohttp_transport")
+
+
 @pytest.fixture(autouse=True)
 def add_api_keys_to_env(monkeypatch):
     monkeypatch.setenv("ANTHROPIC_API_KEY", "sk-ant-api03-1234567890")
diff --git a/tests/test_litellm/vector_stores/test_vector_store_create_provider_logic.py b/tests/test_litellm/vector_stores/test_vector_store_create_provider_logic.py
index cca20847f12..08da9b9807f 100644
--- a/tests/test_litellm/vector_stores/test_vector_store_create_provider_logic.py
+++ b/tests/test_litellm/vector_stores/test_vector_store_create_provider_logic.py
@@ -51,9 +51,10 @@ def test_vector_store_create_with_simple_provider_name():
     )
     
     assert vector_store_provider_config is not None, "Should return a config for OpenAI"
-    assert isinstance(
-        vector_store_provider_config, OpenAIVectorStoreConfig
-    ), "Should return OpenAIVectorStoreConfig for OpenAI provider"
+    # Use type name check instead of isinstance to avoid module identity issues
+    # caused by sys.path manipulation in test setup
+    assert type(vector_store_provider_config).__name__ == "OpenAIVectorStoreConfig", \
+        f"Should return OpenAIVectorStoreConfig for OpenAI provider, got {type(vector_store_provider_config).__name__}"
     
     print("✅ Test passed: Simple provider name 'openai' handled correctly")
 
@@ -97,9 +98,9 @@ def test_vector_store_create_with_provider_api_type():
     )
     
     assert vector_store_provider_config is not None, "Should return a config for Vertex AI"
-    assert isinstance(
-        vector_store_provider_config, VertexVectorStoreConfig
-    ), "Should return VertexVectorStoreConfig for vertex_ai provider with rag_api"
+    # Use type name check instead of isinstance to avoid module identity issues
+    assert type(vector_store_provider_config).__name__ == "VertexVectorStoreConfig", \
+        f"Should return VertexVectorStoreConfig for vertex_ai provider with rag_api, got {type(vector_store_provider_config).__name__}"
     
     print("✅ Test passed: Provider with api_type 'vertex_ai/rag_api' handled correctly")
 
@@ -134,9 +135,9 @@ def test_vector_store_create_with_ragflow_provider():
     )
     
     assert vector_store_provider_config is not None, "Should return a config for RAGFlow"
-    assert isinstance(
-        vector_store_provider_config, RAGFlowVectorStoreConfig
-    ), "Should return RAGFlowVectorStoreConfig for RAGFlow provider"
+    # Use type name check instead of isinstance to avoid module identity issues
+    assert type(vector_store_provider_config).__name__ == "RAGFlowVectorStoreConfig", \
+        f"Should return RAGFlowVectorStoreConfig for RAGFlow provider, got {type(vector_store_provider_config).__name__}"
     
     print("✅ Test passed: RAGFlow provider handled correctly")
 
diff --git a/tests/test_litellm/vector_stores/test_vector_store_registry.py b/tests/test_litellm/vector_stores/test_vector_store_registry.py
index a3af476bc71..98127efc9ee 100644
--- a/tests/test_litellm/vector_stores/test_vector_store_registry.py
+++ b/tests/test_litellm/vector_stores/test_vector_store_registry.py
@@ -21,6 +21,27 @@
 from litellm.vector_stores.vector_store_registry import VectorStoreRegistry
 
 
+@pytest.fixture(autouse=True)
+def disable_aiohttp_transport():
+    """
+    Disable aiohttp transport so respx can intercept httpx requests.
+    Also clear the client cache to ensure fresh clients are created.
+    """
+    original_value = getattr(litellm, "disable_aiohttp_transport", None)
+    litellm.disable_aiohttp_transport = True
+    
+    cache = getattr(litellm, "in_memory_llm_clients_cache", None)
+    if cache is not None:
+        cache.flush_cache()
+    
+    yield
+    
+    if original_value is not None:
+        litellm.disable_aiohttp_transport = original_value
+    elif hasattr(litellm, "disable_aiohttp_transport"):
+        delattr(litellm, "disable_aiohttp_transport")
+
+
 def test_get_credentials_for_vector_store():
     """Test that get_credentials_for_vector_store returns correct credentials"""
     # Create test vector stores