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Provider Failure Cascade Tests
Test how the system handles LLM provider failures:
- All providers fail (timeout, rate limit, server error)
- Primary provider fails, fallback to secondary succeeds
- Providers fail sequentially, fallback logic verification
- No providers configured scenario
All tests use mocks to simulate provider failures without actual API calls.
"""
import pytest
import asyncio
from unittest.mock import AsyncMock, MagicMock, patch
from typing import Dict, List
class TestAllProvidersFail:
"""Test behavior when all LLM providers fail."""
@pytest.mark.asyncio
async def test_all_providers_fail(self):
"""
FAILURE MODE: All configured LLM providers fail with API errors.
EXPECTED: Attempts all providers, returns clear error, doesn't crash.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock all providers to fail (add them even if not configured)
provider_ids = ["deepseek", "openai", "moonshot", "minimax"]
for provider_id in provider_ids:
mock_client = MagicMock()
mock_client.chat.completions.create = AsyncMock(
side_effect=Exception(f"{provider_id} API error (500)")
)
handler.clients[provider_id] = mock_client
handler.async_clients[provider_id] = mock_client
# Should try all providers and return error
try:
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# Should not crash
assert response is not None
# Should mention error/failure
response_lower = response.lower()
assert any(keyword in response_lower for keyword in ["error", "failed", "unavailable", "provider"])
except Exception as e:
# Exception is acceptable if it mentions providers failed
error_str = str(e).lower()
assert any(keyword in error_str for keyword in ["provider", "failed", "error"])
@pytest.mark.asyncio
async def test_all_providers_timeout(self):
"""
FAILURE MODE: All LLM providers timeout.
EXPECTED: Graceful degradation, timeout error message.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock all providers to timeout (add them even if not configured)
provider_ids = ["deepseek", "openai"]
for provider_id in provider_ids:
mock_client = MagicMock()
mock_client.chat.completions.create = AsyncMock(
side_effect=asyncio.TimeoutError(f"{provider_id} request timed out")
)
handler.clients[provider_id] = mock_client
handler.async_clients[provider_id] = mock_client
# Should timeout gracefully
try:
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
assert response is not None
assert "timeout" in response.lower() or "failed" in response.lower()
except (asyncio.TimeoutError, Exception) as e:
assert "timeout" in str(e).lower()
@pytest.mark.asyncio
async def test_all_providers_rate_limited(self):
"""
FAILURE MODE: All LLM providers return rate limit errors.
EXPECTED: Clear rate limit error message, graceful degradation.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock all providers to rate limit (add them even if not configured)
provider_ids = ["deepseek", "openai"]
for provider_id in provider_ids:
mock_client = MagicMock()
mock_client.chat.completions.create = AsyncMock(
side_effect=Exception(f"Rate limit exceeded (429) for {provider_id}")
)
handler.clients[provider_id] = mock_client
handler.async_clients[provider_id] = mock_client
# Should handle rate limit gracefully
try:
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
assert response is not None
response_lower = response.lower()
assert any(keyword in response_lower for keyword in ["rate limit", "429", "quota", "exceeded"])
except Exception as e:
error_str = str(e).lower()
assert any(keyword in error_str for keyword in ["rate limit", "429", "quota"])
class TestPrimaryProviderFailure:
"""Test fallback when primary provider fails."""
@pytest.mark.asyncio
async def test_primary_provider_fails_fallback_to_secondary(self):
"""
FAILURE MODE: Primary provider fails, secondary succeeds.
EXPECTED: Fallback to secondary provider, response returned.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock OpenAI to fail (add even if not configured)
mock_openai = MagicMock()
mock_openai.chat.completions.create = AsyncMock(
side_effect=Exception("OpenAI API error (500)")
)
handler.clients["openai"] = mock_openai
handler.async_clients["openai"] = mock_openai
# Mock Deepseek to succeed
mock_deepseek = MagicMock()
mock_deepseek.chat.completions.create = AsyncMock(
return_value=MagicMock(
choices=[MagicMock(message=MagicMock(content="Success from Deepseek"))]
)
)
handler.clients["deepseek"] = mock_deepseek
handler.async_clients["deepseek"] = mock_deepseek
# Should fallback to Deepseek
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# Should succeed with Deepseek response
assert response is not None
assert "deepseek" in response.lower() or "success" in response.lower()
@pytest.mark.asyncio
async def test_primary_provider_rate_limits_secondary_succeeds(self):
"""
FAILURE MODE: Primary provider rate limited, secondary succeeds.
EXPECTED: Fallback triggered, secondary response returned.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock OpenAI to rate limit (add even if not configured)
mock_openai = MagicMock()
mock_openai.chat.completions.create = AsyncMock(
side_effect=Exception("Rate limit exceeded (429)")
)
handler.clients["openai"] = mock_openai
handler.async_clients["openai"] = mock_openai
# Mock Deepseek to succeed
mock_deepseek = MagicMock()
mock_deepseek.chat.completions.create = AsyncMock(
return_value=MagicMock(
choices=[MagicMock(message=MagicMock(content="Response from Deepseek"))]
)
)
handler.clients["deepseek"] = mock_deepseek
handler.async_clients["deepseek"] = mock_deepseek
# Should fallback to Deepseek
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# Should succeed with Deepseek
assert response is not None
assert "deepseek" in response.lower() or "response" in response.lower()
@pytest.mark.asyncio
async def test_primary_provider_timeout_secondary_succeeds(self):
"""
FAILURE MODE: Primary provider times out, secondary succeeds.
EXPECTED: Timeout detected, secondary provider attempted, response returned.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock OpenAI to timeout (add even if not configured)
mock_openai = MagicMock()
mock_openai.chat.completions.create = AsyncMock(
side_effect=asyncio.TimeoutError("OpenAI request timed out")
)
handler.clients["openai"] = mock_openai
handler.async_clients["openai"] = mock_openai
# Mock Deepseek to succeed
mock_deepseek = MagicMock()
mock_deepseek.chat.completions.create = AsyncMock(
return_value=MagicMock(
choices=[MagicMock(message=MagicMock(content="Success from fallback"))]
)
)
handler.clients["deepseek"] = mock_deepseek
handler.async_clients["deepseek"] = mock_deepseek
# Should fallback to Deepseek
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# Should succeed with fallback
assert response is not None
assert "fallback" in response.lower() or "success" in response.lower()
class TestProviderCascade:
"""Test providers failing sequentially."""
@pytest.mark.asyncio
async def test_providers_fail_sequentially(self):
"""
FAILURE MODE: Providers fail one by one, all attempted before giving up.
EXPECTED: All providers attempted, clear error after last fails.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock providers to fail sequentially (add even if not configured)
provider_ids = ["deepseek", "openai", "moonshot"]
attempted_providers = []
async def failing_create(*args, **kwargs):
# Track which provider was called
# This is a simplified tracking mechanism
raise Exception("Simulated failure")
for provider_id in provider_ids:
mock_client = MagicMock()
mock_client.chat.completions.create = AsyncMock(side_effect=failing_create)
handler.clients[provider_id] = mock_client
handler.async_clients[provider_id] = mock_client
# Should try all providers and fail
try:
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# If it returns (shouldn't happen), it should mention error
assert response is not None
response_lower = response.lower()
assert any(keyword in response_lower for keyword in ["error", "failed", "provider"])
except Exception as e:
# Should fail with error mentioning all providers failed
error_str = str(e).lower()
assert any(keyword in error_str for keyword in ["provider", "failed"])
# Track which providers were attempted
attempted_providers = []
# Mock providers to fail sequentially
provider_ids = ["openai", "anthropic", "deepseek"]
for provider_id in provider_ids:
if provider_id not in handler.clients:
continue
async def mock_fail(pid=provider_id):
attempted_providers.append(pid)
raise Exception(f"{pid} failed")
mock_client = MagicMock()
mock_client.chat.completions.create = AsyncMock(side_effect=mock_fail)
handler.clients[provider_id] = mock_client
handler.async_clients[provider_id] = mock_client
# Should attempt all providers
try:
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# If response returned, should mention all failed
assert response is not None
except Exception as e:
# Exception should mention provider failure
assert "fail" in str(e).lower() or "provider" in str(e).lower()
# Verify multiple providers were attempted
# (Note: This depends on BYOKHandler implementation)
assert len(attempted_providers) >= 1
@pytest.mark.asyncio
async def test_provider_unavailable(self):
"""
FAILURE MODE: Provider raises ConnectionError (unavailable).
EXPECTED: Next provider tried, fallback works.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock OpenAI to be unavailable
if "openai" in handler.clients:
mock_openai = MagicMock()
mock_openai.chat.completions.create = AsyncMock(
side_effect=ConnectionError("OpenAI service unavailable")
)
handler.clients["openai"] = mock_openai
handler.async_clients["openai"] = mock_openai
# Mock Anthropic to succeed
if "anthropic" in handler.clients:
mock_anthropic = MagicMock()
mock_anthropic.chat.completions.create = AsyncMock(
return_value=MagicMock(
choices=[MagicMock(message=MagicMock(content="Success"))]
)
)
handler.clients["anthropic"] = mock_anthropic
handler.async_clients["anthropic"] = mock_anthropic
# Should fallback to Anthropic
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# Should succeed with fallback
assert response is not None
@pytest.mark.asyncio
async def test_provider_api_key_invalid(self):
"""
FAILURE MODE: Provider raises AuthenticationError (invalid API key).
EXPECTED: Fallback to next provider, auth error logged.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock OpenAI with invalid API key
if "openai" in handler.clients:
mock_openai = MagicMock()
mock_openai.chat.completions.create = AsyncMock(
side_effect=Exception("Unauthorized (401): Invalid API key")
)
handler.clients["openai"] = mock_openai
handler.async_clients["openai"] = mock_openai
# Mock Anthropic to succeed
if "anthropic" in handler.clients:
mock_anthropic = MagicMock()
mock_anthropic.chat.completions.create = AsyncMock(
return_value=MagicMock(
choices=[MagicMock(message=MagicMock(content="Success"))]
)
)
handler.clients["anthropic"] = mock_anthropic
handler.async_clients["anthropic"] = mock_anthropic
# Should fallback to Anthropic
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# Should succeed despite auth error
assert response is not None
class TestFallbackVerification:
"""Verify fallback provider behavior."""
@pytest.mark.asyncio
async def test_fallback_provider_called(self):
"""
FAILURE MODE: Primary fails, verify fallback provider API called.
EXPECTED: Fallback provider's API method called.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock primary to fail
if "openai" in handler.clients:
mock_openai = MagicMock()
mock_openai.chat.completions.create = AsyncMock(
side_effect=Exception("Primary failed")
)
handler.clients["openai"] = mock_openai
handler.async_clients["openai"] = mock_openai
# Mock fallback to succeed
if "anthropic" in handler.clients:
mock_anthropic = MagicMock()
mock_anthropic.chat.completions.create = AsyncMock(
return_value=MagicMock(
choices=[MagicMock(message=MagicMock(content="Fallback success"))]
)
)
handler.clients["anthropic"] = mock_anthropic
handler.async_clients["anthropic"] = mock_anthropic
# Trigger fallback
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# Verify response
assert response is not None
# Note: Verifying actual method call depends on BYOKHandler implementation
# This test documents the expected behavior
@pytest.mark.asyncio
async def test_no_providers_configured(self):
"""
FAILURE MODE: No providers configured (empty providers dict).
EXPECTED: Clear error message, graceful handling.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Save original providers
original_clients = handler.clients.copy()
original_async_clients = handler.async_clients.copy()
# Clear all providers
handler.clients.clear()
handler.async_clients.clear()
# Should return clear error
try:
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# If response returned, should mention no providers
assert response is not None
assert "provider" in response.lower() or "configured" in response.lower()
except Exception as e:
# Exception should mention no providers
assert "provider" in str(e).lower() or "configured" in str(e).lower()
finally:
# Restore providers
handler.clients = original_clients
handler.async_clients = original_async_clients
class TestProviderFailureEdgeCases:
"""Test edge cases in provider failure handling."""
@pytest.mark.asyncio
async def test_provider_context_window_exceeded(self):
"""
FAILURE MODE: Provider raises context window exceeded error.
EXPECTED: Error handled, clear message, fallback attempted.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock OpenAI to exceed context window
if "openai" in handler.clients:
mock_openai = MagicMock()
mock_openai.chat.completions.create = AsyncMock(
side_effect=Exception("This model's maximum context length is 128000 tokens")
)
handler.clients["openai"] = mock_openai
handler.async_clients["openai"] = mock_openai
# Mock Anthropic to succeed (with larger context)
if "anthropic" in handler.clients:
mock_anthropic = MagicMock()
mock_anthropic.chat.completions.create = AsyncMock(
return_value=MagicMock(
choices=[MagicMock(message=MagicMock(content="Success"))]
)
)
handler.clients["anthropic"] = mock_anthropic
handler.async_clients["anthropic"] = mock_anthropic
# Should fallback to Anthropic
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# Should succeed with fallback
assert response is not None
@pytest.mark.asyncio
async def test_provider_server_error_500(self):
"""
FAILURE MODE: Provider returns 500 Internal Server Error.
EXPECTED: Fallback triggered, error logged.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock OpenAI with 500 error
if "openai" in handler.clients:
mock_openai = MagicMock()
mock_openai.chat.completions.create = AsyncMock(
side_effect=Exception("Internal server error (500)")
)
handler.clients["openai"] = mock_openai
handler.async_clients["openai"] = mock_openai
# Mock Anthropic to succeed
if "anthropic" in handler.clients:
mock_anthropic = MagicMock()
mock_anthropic.chat.completions.create = AsyncMock(
return_value=MagicMock(
choices=[MagicMock(message=MagicMock(content="Success"))]
)
)
handler.clients["anthropic"] = mock_anthropic
handler.async_clients["anthropic"] = mock_anthropic
# Should fallback to Anthropic
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# Should succeed with fallback
assert response is not None
@pytest.mark.asyncio
async def test_provider_service_unavailable_503(self):
"""
FAILURE MODE: Provider returns 503 Service Unavailable.
EXPECTED: Fallback triggered, graceful degradation.
"""
from core.llm.byok_handler import BYOKHandler
handler = BYOKHandler()
# Mock OpenAI with 503 error
if "openai" in handler.clients:
mock_openai = MagicMock()
mock_openai.chat.completions.create = AsyncMock(
side_effect=Exception("Service unavailable (503)")
)
handler.clients["openai"] = mock_openai
handler.async_clients["openai"] = mock_openai
# Mock Anthropic to succeed
if "anthropic" in handler.clients:
mock_anthropic = MagicMock()
mock_anthropic.chat.completions.create = AsyncMock(
return_value=MagicMock(
choices=[MagicMock(message=MagicMock(content="Success"))]
)
)
handler.clients["anthropic"] = mock_anthropic
handler.async_clients["anthropic"] = mock_anthropic
# Should fallback to Anthropic
response = await handler.generate_response(
prompt="test prompt",
system_instruction="You are helpful"
)
# Should succeed with fallback
assert response is not None
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