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"""
Module: tests.test_infrastructure.test_retry_policy
Description: Tests for retry policies and circuit breaker
Author: Anderson H. Silva
Date: 2025-01-25
License: Proprietary - All rights reserved
"""
import pytest
import asyncio
from datetime import datetime, timedelta
from unittest.mock import MagicMock, AsyncMock, patch
from src.infrastructure.queue.retry_policy import (
RetryStrategy,
RetryPolicy,
RetryHandler,
CircuitBreaker,
DEFAULT_RETRY_POLICY,
AGGRESSIVE_RETRY_POLICY,
GENTLE_RETRY_POLICY
)
class TestRetryPolicy:
"""Test suite for retry policies."""
def test_default_policy(self):
"""Test default retry policy settings."""
assert DEFAULT_RETRY_POLICY.strategy == RetryStrategy.EXPONENTIAL_BACKOFF
assert DEFAULT_RETRY_POLICY.max_attempts == 3
assert DEFAULT_RETRY_POLICY.initial_delay == 1.0
assert DEFAULT_RETRY_POLICY.jitter is True
def test_aggressive_policy(self):
"""Test aggressive retry policy."""
assert AGGRESSIVE_RETRY_POLICY.max_attempts == 5
assert AGGRESSIVE_RETRY_POLICY.initial_delay == 0.5
assert AGGRESSIVE_RETRY_POLICY.multiplier == 1.5
def test_gentle_policy(self):
"""Test gentle retry policy."""
assert GENTLE_RETRY_POLICY.strategy == RetryStrategy.LINEAR_BACKOFF
assert GENTLE_RETRY_POLICY.max_attempts == 2
assert GENTLE_RETRY_POLICY.jitter is False
class TestRetryHandler:
"""Test suite for retry handler."""
def test_should_retry_max_attempts(self):
"""Test retry decision based on max attempts."""
policy = RetryPolicy(max_attempts=3)
handler = RetryHandler(policy)
exception = ValueError("Test error")
assert handler.should_retry(exception, 1) is True
assert handler.should_retry(exception, 2) is True
assert handler.should_retry(exception, 3) is False # Max reached
def test_should_retry_exception_whitelist(self):
"""Test retry with specific exception types."""
policy = RetryPolicy(
retry_on=[ValueError, TypeError]
)
handler = RetryHandler(policy)
assert handler.should_retry(ValueError("test"), 1) is True
assert handler.should_retry(TypeError("test"), 1) is True
assert handler.should_retry(RuntimeError("test"), 1) is False
def test_should_retry_exception_blacklist(self):
"""Test retry with exception blacklist."""
policy = RetryPolicy(
dont_retry_on=[RuntimeError, KeyError]
)
handler = RetryHandler(policy)
assert handler.should_retry(ValueError("test"), 1) is True
assert handler.should_retry(RuntimeError("test"), 1) is False
assert handler.should_retry(KeyError("test"), 1) is False
def test_calculate_delay_fixed(self):
"""Test fixed delay calculation."""
policy = RetryPolicy(
strategy=RetryStrategy.FIXED_DELAY,
initial_delay=2.0,
jitter=False
)
handler = RetryHandler(policy)
assert handler.calculate_delay(1) == 2.0
assert handler.calculate_delay(2) == 2.0
assert handler.calculate_delay(3) == 2.0
def test_calculate_delay_exponential(self):
"""Test exponential backoff calculation."""
policy = RetryPolicy(
strategy=RetryStrategy.EXPONENTIAL_BACKOFF,
initial_delay=1.0,
multiplier=2.0,
jitter=False
)
handler = RetryHandler(policy)
assert handler.calculate_delay(1) == 1.0
assert handler.calculate_delay(2) == 2.0
assert handler.calculate_delay(3) == 4.0
assert handler.calculate_delay(4) == 8.0
def test_calculate_delay_linear(self):
"""Test linear backoff calculation."""
policy = RetryPolicy(
strategy=RetryStrategy.LINEAR_BACKOFF,
initial_delay=2.0,
jitter=False
)
handler = RetryHandler(policy)
assert handler.calculate_delay(1) == 2.0
assert handler.calculate_delay(2) == 4.0
assert handler.calculate_delay(3) == 6.0
def test_calculate_delay_fibonacci(self):
"""Test fibonacci backoff calculation."""
policy = RetryPolicy(
strategy=RetryStrategy.FIBONACCI,
initial_delay=1.0,
jitter=False
)
handler = RetryHandler(policy)
assert handler.calculate_delay(1) == 1.0 # fib(1) = 1
assert handler.calculate_delay(2) == 1.0 # fib(2) = 1
assert handler.calculate_delay(3) == 2.0 # fib(3) = 2
assert handler.calculate_delay(4) == 3.0 # fib(4) = 3
assert handler.calculate_delay(5) == 5.0 # fib(5) = 5
def test_calculate_delay_with_jitter(self):
"""Test delay calculation with jitter."""
policy = RetryPolicy(
strategy=RetryStrategy.FIXED_DELAY,
initial_delay=10.0,
jitter=True
)
handler = RetryHandler(policy)
# With jitter, delay should be within ±25% of base
delays = [handler.calculate_delay(1) for _ in range(10)]
assert all(7.5 <= d <= 12.5 for d in delays)
# Should have some variation
assert len(set(delays)) > 1
def test_calculate_delay_max_cap(self):
"""Test delay is capped at max_delay."""
policy = RetryPolicy(
strategy=RetryStrategy.EXPONENTIAL_BACKOFF,
initial_delay=10.0,
multiplier=10.0,
max_delay=50.0,
jitter=False
)
handler = RetryHandler(policy)
assert handler.calculate_delay(1) == 10.0
assert handler.calculate_delay(2) == 50.0 # Would be 100 but capped
assert handler.calculate_delay(3) == 50.0 # Would be 1000 but capped
@pytest.mark.asyncio
async def test_execute_with_retry_success(self):
"""Test successful execution without retry."""
policy = RetryPolicy()
handler = RetryHandler(policy)
async def successful_func(value):
return value * 2
result = await handler.execute_with_retry(successful_func, 5)
assert result == 10
@pytest.mark.asyncio
async def test_execute_with_retry_eventual_success(self):
"""Test execution that succeeds after retries."""
policy = RetryPolicy(
initial_delay=0.1,
jitter=False
)
handler = RetryHandler(policy)
attempt_count = 0
async def flaky_func():
nonlocal attempt_count
attempt_count += 1
if attempt_count < 3:
raise ValueError("Temporary failure")
return "success"
result = await handler.execute_with_retry(flaky_func)
assert result == "success"
assert attempt_count == 3
@pytest.mark.asyncio
async def test_execute_with_retry_max_attempts_exceeded(self):
"""Test execution that fails after max attempts."""
policy = RetryPolicy(
max_attempts=2,
initial_delay=0.1,
jitter=False
)
handler = RetryHandler(policy)
async def always_failing_func():
raise ValueError("Always fails")
with pytest.raises(ValueError) as exc_info:
await handler.execute_with_retry(always_failing_func)
assert str(exc_info.value) == "Always fails"
@pytest.mark.asyncio
async def test_execute_with_retry_callbacks(self):
"""Test retry callbacks."""
retry_calls = []
failure_calls = []
def on_retry(exc, attempt, delay):
retry_calls.append((str(exc), attempt, delay))
def on_failure(exc, attempt, delay):
failure_calls.append((str(exc), attempt))
policy = RetryPolicy(
max_attempts=2,
initial_delay=0.1,
jitter=False,
on_retry=on_retry,
on_failure=on_failure
)
handler = RetryHandler(policy)
async def failing_func():
raise ValueError("Test error")
with pytest.raises(ValueError):
await handler.execute_with_retry(failing_func)
# Should have one retry callback
assert len(retry_calls) == 1
assert retry_calls[0][0] == "Test error"
assert retry_calls[0][1] == 1
# Should have one failure callback
assert len(failure_calls) == 1
assert failure_calls[0][0] == "Test error"
assert failure_calls[0][1] == 2
def test_execute_with_retry_sync_function(self):
"""Test retry with synchronous function."""
policy = RetryPolicy(initial_delay=0.1)
handler = RetryHandler(policy)
attempt_count = 0
def sync_func():
nonlocal attempt_count
attempt_count += 1
if attempt_count < 2:
raise ValueError("Temporary")
return "success"
# Run in async context
result = asyncio.run(handler.execute_with_retry(sync_func))
assert result == "success"
assert attempt_count == 2
class TestCircuitBreaker:
"""Test suite for circuit breaker."""
def test_circuit_breaker_initialization(self):
"""Test circuit breaker initialization."""
breaker = CircuitBreaker(
failure_threshold=3,
recovery_timeout=30.0
)
assert breaker.state == CircuitBreaker.State.CLOSED
assert breaker.failure_count == 0
assert breaker.failure_threshold == 3
assert breaker.recovery_timeout == 30.0
def test_circuit_breaker_success(self):
"""Test circuit breaker with successful calls."""
breaker = CircuitBreaker()
def successful_func():
return "success"
# Multiple successful calls
for _ in range(10):
result = breaker.call(successful_func)
assert result == "success"
assert breaker.state == CircuitBreaker.State.CLOSED
assert breaker.failure_count == 0
def test_circuit_breaker_opens_on_failures(self):
"""Test circuit breaker opens after threshold."""
breaker = CircuitBreaker(failure_threshold=3)
def failing_func():
raise ValueError("Always fails")
# First failures
for i in range(3):
with pytest.raises(ValueError):
breaker.call(failing_func)
# Circuit should be open
assert breaker.state == CircuitBreaker.State.OPEN
assert breaker.failure_count == 3
# Next call should fail immediately
with pytest.raises(Exception) as exc_info:
breaker.call(failing_func)
assert "Circuit breaker is OPEN" in str(exc_info.value)
def test_circuit_breaker_half_open_recovery(self):
"""Test circuit breaker recovery through half-open state."""
breaker = CircuitBreaker(
failure_threshold=2,
recovery_timeout=0.1 # Short timeout for testing
)
# Open the circuit
def failing_func():
raise ValueError("Fails")
for _ in range(2):
with pytest.raises(ValueError):
breaker.call(failing_func)
assert breaker.state == CircuitBreaker.State.OPEN
# Wait for recovery timeout
import time
time.sleep(0.2)
# Next call should transition to half-open
def successful_func():
return "success"
# First success in half-open
result = breaker.call(successful_func)
assert result == "success"
assert breaker.state == CircuitBreaker.State.HALF_OPEN
# Need more successes to fully close
for _ in range(2):
breaker.call(successful_func)
assert breaker.state == CircuitBreaker.State.CLOSED
def test_circuit_breaker_half_open_failure(self):
"""Test circuit breaker returns to open on half-open failure."""
breaker = CircuitBreaker(
failure_threshold=2,
recovery_timeout=0.1
)
# Open the circuit
def failing_func():
raise ValueError("Fails")
for _ in range(2):
with pytest.raises(ValueError):
breaker.call(failing_func)
# Wait for recovery
import time
time.sleep(0.2)
# Fail in half-open state
with pytest.raises(ValueError):
breaker.call(failing_func)
# Should return to open
assert breaker.state == CircuitBreaker.State.OPEN
@pytest.mark.asyncio
async def test_circuit_breaker_async(self):
"""Test circuit breaker with async functions."""
breaker = CircuitBreaker(failure_threshold=2)
async def async_failing():
raise ValueError("Async fail")
# Open circuit
for _ in range(2):
with pytest.raises(ValueError):
await breaker.call_async(async_failing)
assert breaker.state == CircuitBreaker.State.OPEN
# Next call should fail immediately
with pytest.raises(Exception) as exc_info:
await breaker.call_async(async_failing)
assert "Circuit breaker is OPEN" in str(exc_info.value)
def test_circuit_breaker_expected_exception(self):
"""Test circuit breaker only triggers on expected exceptions."""
breaker = CircuitBreaker(
failure_threshold=2,
expected_exception=ValueError
)
def func_with_different_error():
raise TypeError("Different error")
# These shouldn't trigger the breaker
for _ in range(5):
with pytest.raises(TypeError):
breaker.call(func_with_different_error)
assert breaker.state == CircuitBreaker.State.CLOSED
assert breaker.failure_count == 0
# But ValueError should
def func_with_expected_error():
raise ValueError("Expected error")
for _ in range(2):
with pytest.raises(ValueError):
breaker.call(func_with_expected_error)
assert breaker.state == CircuitBreaker.State.OPEN |