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"""Tests for shared.resilience module."""
import asyncio
import pytest
from shared.resilience import CircuitBreaker, async_timeout, retry_async
# --- retry_async tests ---
async def test_succeeds_without_retry():
"""Function succeeds first try, called once."""
call_count = 0
@retry_async()
async def fn():
nonlocal call_count
call_count += 1
return "ok"
result = await fn()
assert result == "ok"
assert call_count == 1
async def test_retries_on_failure_then_succeeds():
"""Fails twice then succeeds, verify call count."""
call_count = 0
@retry_async(max_retries=3, base_delay=0.01)
async def fn():
nonlocal call_count
call_count += 1
if call_count < 3:
raise RuntimeError("transient")
return "recovered"
result = await fn()
assert result == "recovered"
assert call_count == 3
async def test_raises_after_max_retries():
"""Always fails, raises after max retries."""
call_count = 0
@retry_async(max_retries=3, base_delay=0.01)
async def fn():
nonlocal call_count
call_count += 1
raise ValueError("permanent")
with pytest.raises(ValueError, match="permanent"):
await fn()
# 1 initial + 3 retries = 4 total calls
assert call_count == 4
async def test_no_retry_on_excluded_exception():
"""Excluded exception raises immediately, call count = 1."""
call_count = 0
@retry_async(max_retries=3, base_delay=0.01, exclude=(TypeError,))
async def fn():
nonlocal call_count
call_count += 1
raise TypeError("excluded")
with pytest.raises(TypeError, match="excluded"):
await fn()
assert call_count == 1
# --- CircuitBreaker tests ---
async def test_closed_allows_calls():
"""CircuitBreaker in closed state passes through."""
cb = CircuitBreaker(failure_threshold=5, cooldown=60.0)
async def fn():
return "ok"
result = await cb.call(fn)
assert result == "ok"
async def test_opens_after_threshold():
"""After N failures, raises RuntimeError."""
cb = CircuitBreaker(failure_threshold=3, cooldown=60.0)
async def fail():
raise RuntimeError("fail")
for _ in range(3):
with pytest.raises(RuntimeError, match="fail"):
await cb.call(fail)
# Now the breaker should be open
with pytest.raises(RuntimeError, match="Circuit breaker is open"):
await cb.call(fail)
async def test_half_open_after_cooldown():
"""After cooldown, allows recovery attempt."""
cb = CircuitBreaker(failure_threshold=2, cooldown=0.05)
async def fail():
raise RuntimeError("fail")
# Trip the breaker
for _ in range(2):
with pytest.raises(RuntimeError, match="fail"):
await cb.call(fail)
# Breaker is open
with pytest.raises(RuntimeError, match="Circuit breaker is open"):
await cb.call(fail)
# Wait for cooldown
await asyncio.sleep(0.06)
# Now should allow a call (half_open). Succeed to close it.
async def succeed():
return "recovered"
result = await cb.call(succeed)
assert result == "recovered"
# Breaker should be closed again
result = await cb.call(succeed)
assert result == "recovered"
async def test_half_open_reopens_on_failure():
cb = CircuitBreaker(failure_threshold=2, cooldown=0.05)
async def always_fail():
raise ConnectionError("fail")
# Trip the breaker
for _ in range(2):
with pytest.raises(ConnectionError):
await cb.call(always_fail)
# Wait for cooldown
await asyncio.sleep(0.1)
# Half-open probe should fail and re-open
with pytest.raises(ConnectionError):
await cb.call(always_fail)
# Should be open again (no cooldown wait)
with pytest.raises(RuntimeError, match="Circuit breaker is open"):
await cb.call(always_fail)
# --- async_timeout tests ---
async def test_completes_within_timeout():
"""async_timeout doesn't interfere with fast operations."""
async with async_timeout(1.0):
await asyncio.sleep(0.01)
result = 42
assert result == 42
async def test_raises_on_timeout():
"""async_timeout raises TimeoutError for slow operations."""
with pytest.raises(TimeoutError):
async with async_timeout(0.05):
await asyncio.sleep(1.0)
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