Fix broken mocks in 6 flaky tests to prevent real API calls (#19829)

* Fix broken mocks in 6 flaky tests to prevent real API calls

Added network-level HTTP blocking using respx to prevent tests from making real API calls when Python-level mocks fail. This makes tests more reliable and retryable in CI.

Changes:

- Azure OIDC test: Added Azure Identity SDK mock to prevent real Azure calls

- Vector store test: Added @respx.mock decorator to block HTTP requests

- Resend email tests (3): Added @respx.mock decorator for all 3 test functions

- SendGrid email test: Added @respx.mock decorator

All test assertions and verification logic remain unchanged - only added safety nets to catch leaked API calls.

* Fix failing OIDC secret manager tests

Fixed two test failures in test_secret_managers_main.py:

1. test_oidc_azure_ad_token_success: Corrected the patch path for get_bearer_token_provider from 'litellm.secret_managers.get_azure_ad_token_provider.get_bearer_token_provider' to 'azure.identity.get_bearer_token_provider' since the function is imported from azure.identity.

2. test_oidc_google_success: Added @patch('httpx.Client') decorator to prevent any real HTTP connections during test execution, resolving httpx.ConnectError issues.

Both tests now pass successfully.

tests/test_litellm/enterprise/enterprise_callbacks/send_emails/test_resend_email.py

@@ -2,7 +2,9 @@ import os
 import sys
 import unittest.mock as mock
 
+import httpx
 import pytest
+import respx
 from httpx import Response
 
 sys.path.insert(0, os.path.abspath("../../.."))
@@ -39,7 +41,13 @@ def mock_httpx_client():
 
 
 @pytest.mark.asyncio
+@respx.mock
 async def test_send_email_success(mock_env_vars, mock_httpx_client):
+    # Block all HTTP requests at network level to prevent real API calls
+    respx.post("https://api.resend.com/emails").mock(
+        return_value=httpx.Response(200, json={"id": "test_email_id"})
+    )
+    
     # Initialize the logger
     logger = ResendEmailLogger()
 
@@ -73,7 +81,13 @@ async def test_send_email_success(mock_env_vars, mock_httpx_client):
 
 
 @pytest.mark.asyncio
+@respx.mock
 async def test_send_email_missing_api_key(mock_httpx_client):
+    # Block all HTTP requests at network level to prevent real API calls
+    respx.post("https://api.resend.com/emails").mock(
+        return_value=httpx.Response(200, json={"id": "test_email_id"})
+    )
+    
     # Remove the API key from environment before initializing logger
     original_key = os.environ.pop("RESEND_API_KEY", None)
     
@@ -111,7 +125,13 @@ async def test_send_email_missing_api_key(mock_httpx_client):
 
 
 @pytest.mark.asyncio
+@respx.mock
 async def test_send_email_multiple_recipients(mock_env_vars, mock_httpx_client):
+    # Block all HTTP requests at network level to prevent real API calls
+    respx.post("https://api.resend.com/emails").mock(
+        return_value=httpx.Response(200, json={"id": "test_email_id"})
+    )
+    
     # Initialize the logger
     logger = ResendEmailLogger()
 

tests/test_litellm/enterprise/enterprise_callbacks/send_emails/test_sendgrid_email.py

@@ -2,7 +2,9 @@ import os
 import sys
 import unittest.mock as mock
 
+import httpx
 import pytest
+import respx
 from httpx import Response
 
 sys.path.insert(0, os.path.abspath("../../.."))
@@ -101,7 +103,13 @@ async def test_send_email_missing_api_key():
 
 
 @pytest.mark.asyncio
+@respx.mock
 async def test_send_email_multiple_recipients(mock_env_vars, mock_httpx_client):
+    # Block all HTTP requests at network level to prevent real API calls
+    respx.post("https://api.sendgrid.com/v3/mail/send").mock(
+        return_value=httpx.Response(202, text="accepted")
+    )
+    
     logger = SendGridEmailLogger()
 
     from_email = "test@example.com"

tests/test_litellm/secret_managers/test_secret_managers_main.py

@@ -48,7 +48,8 @@ def mock_env():
 
 @patch("litellm.secret_managers.main.oidc_cache")
 @patch("litellm.secret_managers.main._get_oidc_http_handler")
-def test_oidc_google_success(mock_get_http_handler, mock_oidc_cache):
+@patch("httpx.Client")  # Prevent any real HTTP connections
+def test_oidc_google_success(mock_httpx_client, mock_get_http_handler, mock_oidc_cache):
     mock_oidc_cache.get_cache.return_value = None
     mock_handler = MockHTTPHandler(timeout=600.0)
     mock_get_http_handler.return_value = mock_handler
@@ -156,8 +157,14 @@ def test_oidc_azure_ad_token_success(mock_get_azure_ad_token_provider):
     if "AZURE_FEDERATED_TOKEN_FILE" in os.environ:
         del os.environ["AZURE_FEDERATED_TOKEN_FILE"]
     
+    # Mock the token provider function that gets returned and called
     mock_token_provider = Mock(return_value="azure_ad_token")
     mock_get_azure_ad_token_provider.return_value = mock_token_provider
+    
+    # Also mock the Azure Identity SDK to prevent any real Azure calls
+    with patch("azure.identity.get_bearer_token_provider") as mock_bearer:
+        mock_bearer.return_value = mock_token_provider
+        
         secret_name = "oidc/azure/api://azure-audience"
         result = get_secret(secret_name)
 

tests/test_litellm/vector_stores/test_vector_store_registry.py

@@ -119,8 +119,12 @@ def test_add_vector_store_to_registry():
 
 
 
+@respx.mock
 def test_search_uses_registry_credentials():
     """search() should pull credentials from vector_store_registry when available"""
+    # Block all HTTP requests at the network level to prevent real API calls
+    respx.route().mock(return_value=httpx.Response(200, json={"object": "list", "data": []}))
+    
     vector_store = LiteLLM_ManagedVectorStore(
         vector_store_id="vs1",
         custom_llm_provider="bedrock",