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Comprehensive webhook processing tests covering signature verification,
deduplication, out-of-order delivery, retries, timeouts, and event types.
Tests use stripe-mock server, Factory Boy factories, and webhook simulator
for deterministic testing without real API calls.
"""
import asyncio
import json
import os
from datetime import datetime, timedelta
from typing import Dict, Any
from unittest.mock import AsyncMock, MagicMock, Mock
import pytest
from freezegun import freeze_time
from integrations.stripe_routes import (
PROCESSED_WEBHOOK_EVENTS,
cleanup_processed_events,
is_duplicate_event,
mark_event_processed,
verify_webhook_signature,
)
from tests.fixtures.payment_fixtures import (
StripeWebhookEventFactory,
StripePaymentIntentFactory,
StripeSubscriptionFactory,
StripeInvoiceFactory,
)
from tests.mocks.webhook_simulator import (
WebhookSimulator,
WebhookEventBuilder,
generate_stripe_signature,
simulate_out_of_order_delivery,
simulate_retry_scenario,
)
class TestWebhookSignatureVerification:
"""Tests for webhook signature verification (timing-safe comparison)."""
def test_generate_signature_format(self):
"""Signature generator should produce Stripe-format headers."""
payload = '{"id": "evt_test_123"}'
secret = "whsec_test_secret"
signature = generate_stripe_signature(payload, secret)
# Should have timestamp and v1 hash
assert "t=" in signature
assert "v1=" in signature
# Should be deterministic for same payload
signature2 = generate_stripe_signature(payload, secret)
assert signature == signature2
def test_signature_different_payloads(self):
"""Different payloads should produce different signatures."""
secret = "whsec_test_secret"
sig1 = generate_stripe_signature('{"id": "evt_1"}', secret)
sig2 = generate_stripe_signature('{"id": "evt_2"}', secret)
assert sig1 != sig2
def test_signature_different_secrets(self):
"""Different secrets should produce different signatures."""
payload = '{"id": "evt_test"}'
sig1 = generate_stripe_signature(payload, "whsec_secret1")
sig2 = generate_stripe_signature(payload, "whsec_secret2")
assert sig1 != sig2
def test_verify_webhook_signature_no_secret(self):
"""
Without webhook secret configured, verification should skip
and still parse payload (for testing).
"""
payload = b'{"id": "evt_test", "type": "payment_intent.succeeded"}'
signature = "t=123,v1=abc"
# No secret configured - should parse anyway
event = verify_webhook_signature(payload, signature, "")
assert event["id"] == "evt_test"
def test_webhook_simulator_sends_events(self):
"""WebhookSimulator should send events to endpoints."""
simulator = WebhookSimulator("http://localhost:12111/webhook")
event_builder = WebhookEventBuilder()
event = event_builder.create_payment_succeeded("pi_test", 1000)
# Test that send_event doesn't crash
# (Will fail to connect, but that's OK for this test)
try:
response = simulator.send_event(event)
except Exception:
pass # Expected - no server running
simulator.close()
class TestWebhookDeduplication:
"""Tests for webhook event deduplication (prevent double-processing)."""
@pytest.fixture(autouse=True)
def clear_cache(self):
"""Clear deduplication cache before each test."""
PROCESSED_WEBHOOK_EVENTS.clear()
yield
PROCESSED_WEBHOOK_EVENTS.clear()
def test_mark_and_check_duplicate(self):
"""mark_event_processed should make is_duplicate_event return True."""
event_id = "evt_test_duplicate"
# Initially not a duplicate
assert not is_duplicate_event(event_id)
# Mark as processed
mark_event_processed(event_id)
# Now it's a duplicate
assert is_duplicate_event(event_id)
def test_different_events_not_duplicates(self):
"""Different event IDs should not be considered duplicates."""
event1 = "evt_test_1"
event2 = "evt_test_2"
mark_event_processed(event1)
assert is_duplicate_event(event1)
assert not is_duplicate_event(event2)
def test_cleanup_old_events(self):
"""cleanup_processed_events should remove events older than 24h."""
# Add event with old timestamp (>24 hours ago)
old_timestamp = int((datetime.now() - timedelta(hours=25)).timestamp())
PROCESSED_WEBHOOK_EVENTS["evt_old"] = old_timestamp
# Add recent event
recent_timestamp = int((datetime.now() - timedelta(hours=1)).timestamp())
PROCESSED_WEBHOOK_EVENTS["evt_recent"] = recent_timestamp
# Run cleanup
cleanup_processed_events()
# Old event should be removed
assert "evt_old" not in PROCESSED_WEBHOOK_EVENTS
# Recent event should remain
assert "evt_recent" in PROCESSED_WEBHOOK_EVENTS
def test_cleanup_preserves_recent_events(self):
"""Cleanup should not remove events from last 24 hours."""
# Add events at various ages
now = int(datetime.now().timestamp())
PROCESSED_WEBHOOK_EVENTS["evt_1h_ago"] = now - 3600 # 1 hour ago
PROCESSED_WEBHOOK_EVENTS["evt_12h_ago"] = now - 43200 # 12 hours ago
PROCESSED_WEBHOOK_EVENTS["evt_23h_ago"] = now - 82800 # 23 hours ago
cleanup_processed_events()
# All should still be there
assert "evt_1h_ago" in PROCESSED_WEBHOOK_EVENTS
assert "evt_12h_ago" in PROCESSED_WEBHOOK_EVENTS
assert "evt_23h_ago" in PROCESSED_WEBHOOK_EVENTS
class TestWebhookOutOfOrderDelivery:
"""Tests for out-of-order webhook delivery handling."""
@pytest.fixture(autouse=True)
def clear_cache(self):
"""Clear deduplication cache before each test."""
PROCESSED_WEBHOOK_EVENTS.clear()
yield
PROCESSED_WEBHOOK_EVENTS.clear()
def test_simulate_out_of_order_delivery(self):
"""simulate_out_of_order_delivery should shuffle events."""
events = [
{"id": "evt_1", "type": "event.1"},
{"id": "evt_2", "type": "event.2"},
{"id": "evt_3", "type": "event.3"},
]
shuffled = simulate_out_of_order_delivery(events)
# Should have same number of events
assert len(shuffled) == len(events)
# Should have all same IDs
assert {e["id"] for e in shuffled} == {e["id"] for e in events}
def test_out_of_order_events_still_processed(self):
"""
Events processed out of order should all be handled correctly.
Deduplication prevents double-processing.
"""
# Create events in chronological order using factories
event_payment = StripeWebhookEventFactory(
type="payment_intent.succeeded"
)
event_invoice = StripeWebhookEventFactory(
type="invoice.payment_succeeded"
)
# Process out of order: invoice first
payment_id_1 = event_payment["id"]
invoice_id = event_invoice["id"]
# Mark invoice as processed first
mark_event_processed(invoice_id)
# Then payment
mark_event_processed(payment_id_1)
# Both should be in cache
assert is_duplicate_event(invoice_id)
assert is_duplicate_event(payment_id_1)
def test_random_shuffle_doesnt_lose_events(self):
"""Random shuffling should preserve all events."""
import random
events = [
StripeWebhookEventFactory(type="payment_intent.succeeded")
for _ in range(20)
]
event_ids = {e["id"] for e in events}
# Shuffle multiple times
for _ in range(10):
shuffled = simulate_out_of_order_delivery(events)
shuffled_ids = {e["id"] for e in shuffled}
assert shuffled_ids == event_ids
class TestWebhookRetries:
"""Tests for webhook retry behavior with exponential backoff."""
def test_exponential_backoff_delays(self):
"""
Retry delays should follow exponential backoff: 1s, 2s, 4s.
Uses freezegun to verify timing without actual delays.
"""
scenario = simulate_retry_scenario(2)
# Should fail on attempts 1 and 2
assert scenario["fail_attempts"] == [1, 2]
# Should succeed on attempt 3
assert scenario["succeed_on"] == 3
# Delays should be exponential
assert scenario["retry_delays"] == [1.0, 2.0, 4.0]
def test_retry_scenario_configuration(self):
"""simulate_retry_scenario should return valid configuration."""
scenario_1 = simulate_retry_scenario(1)
scenario_3 = simulate_retry_scenario(3)
assert scenario_1["succeed_on"] == 2
assert scenario_3["succeed_on"] == 4
def test_webhook_simulator_retry_logic(self):
"""
WebhookSimulator.send_with_retry should implement exponential backoff.
"""
# Create simulator
simulator = WebhookSimulator("http://localhost:9999/webhook")
event = {"id": "evt_test", "type": "test"}
# Mock responses: fail twice, then succeed
call_count = [0]
def mock_post(*args, **kwargs):
call_count[0] += 1
if call_count[0] <= 2:
return MagicMock(status_code=503)
return MagicMock(status_code=200, json=lambda: {"status": "ok"})
with pytest.MonkeyPatch.context() as m:
m.setattr(simulator.client, "post", mock_post)
# This will fail to connect, but tests the logic
try:
simulator.send_with_retry(event, max_retries=3)
except Exception:
pass
# Should have attempted 3 times
assert call_count[0] == 3
class TestWebhookTimeouts:
"""Tests for webhook timeout scenarios."""
def test_burst_delivery_tagging(self):
"""
simulate_burst_delivery should tag events with timing information.
"""
from tests.mocks.webhook_simulator import simulate_burst_delivery
events = [
{"id": f"evt_{i}"}
for i in range(100)
]
tagged = simulate_burst_delivery(events, events_per_second=100)
# Should have all events
assert len(tagged) == 100
# Should have timing tags
assert "_simulated_delay_ms" in tagged[0]
# First event should have minimal delay
assert tagged[0]["_simulated_delay_ms"] == 0
# Last event should have delay (~990ms for 100 events at 100/sec)
assert tagged[-1]["_simulated_delay_ms"] >= 990
def test_burst_delivery_different_rates(self):
"""
Different event rates should produce different delays.
"""
from tests.mocks.webhook_simulator import simulate_burst_delivery
events = [{"id": "evt_1"}, {"id": "evt_2"}]
# 10 events per second = 100ms between events
tagged_slow = simulate_burst_delivery(events, events_per_second=10)
# 100 events per second = 10ms between events
tagged_fast = simulate_burst_delivery(events, events_per_second=100)
# Fast rate should have smaller delays
assert tagged_fast[1]["_simulated_delay_ms"] < tagged_slow[1]["_simulated_delay_ms"]
class TestWebhookEventTypes:
"""Tests for different Stripe webhook event types."""
@pytest.fixture(autouse=True)
def clear_cache(self):
"""Clear deduplication cache before each test."""
PROCESSED_WEBHOOK_EVENTS.clear()
yield
PROCESSED_WEBHOOK_EVENTS.clear()
def test_webhook_event_builder_creates_valid_events(self):
"""WebhookEventBuilder should create properly formatted events."""
builder = WebhookEventBuilder()
# Test payment succeeded
event1 = builder.create_payment_succeeded("pi_test", 1000)
assert event1["type"] == "payment_intent.succeeded"
assert event1["data"]["object"]["id"] == "pi_test"
assert event1["data"]["object"]["amount"] == 1000
# Test payment failed
event2 = builder.create_payment_failed("pi_test", "card_declined")
assert event2["type"] == "payment_intent.payment_failed"
assert event2["data"]["object"]["last_payment_error"]["code"] == "card_declined"
# Test subscription created
event3 = builder.create_subscription_created("sub_test")
assert event3["type"] == "customer.subscription.created"
assert event3["data"]["object"]["id"] == "sub_test"
# Test invoice paid
event4 = builder.create_invoice_paid("in_test", 2000)
assert event4["type"] == "invoice.payment_succeeded"
assert event4["data"]["object"]["amount_paid"] == 2000
def test_factory_creates_webhook_events(self):
"""StripeWebhookEventFactory should create valid events."""
event = StripeWebhookEventFactory(type="payment_intent.succeeded")
assert "id" in event
assert event["type"] == "payment_intent.succeeded"
assert "data" in event
assert "object" in event["data"]
def test_all_event_types_have_ids(self):
"""All webhook events should have unique IDs."""
builder = WebhookEventBuilder()
events = [
builder.create_payment_succeeded("pi_1", 1000),
builder.create_payment_failed("pi_2", "card_declined"),
builder.create_subscription_created("sub_1"),
builder.create_invoice_paid("in_1", 1000),
]
# All should have unique event IDs
event_ids = [e["id"] for e in events]
assert len(event_ids) == len(set(event_ids))
def test_deduplication_prevents_double_processing(self):
"""
Deduplication cache should prevent same event from being processed twice.
"""
event_id = "evt_test_dedup"
# First time - not a duplicate
assert not is_duplicate_event(event_id)
# Mark as processed
mark_event_processed(event_id)
# Second time - duplicate detected
assert is_duplicate_event(event_id)
class TestWebhookSimulator:
"""Tests for WebhookSimulator functionality."""
def test_webhook_simulator_initialization(self):
"""WebhookSimulator should initialize with endpoint URL."""
simulator = WebhookSimulator("http://localhost:8000/webhook")
assert simulator.webhook_endpoint_url == "http://localhost:8000/webhook"
assert simulator.client is not None
simulator.close()
def test_webhook_simulator_context_manager(self):
"""WebhookSimulator should work as context manager."""
with WebhookSimulator("http://localhost:8000/webhook") as simulator:
assert simulator.webhook_endpoint_url == "http://localhost:8000/webhook"
# Should close automatically
def test_send_event_without_server(self):
"""Sending event without server should handle gracefully."""
simulator = WebhookSimulator("http://localhost:9999/no-server")
event_builder = WebhookEventBuilder()
event = event_builder.create_payment_succeeded("pi_test", 1000)
# Should raise connection error (expected)
with pytest.raises(Exception):
simulator.send_event(event)
simulator.close()
def test_send_duplicate_events(self):
"""send_duplicate should send same event multiple times."""
# This test validates the method exists and has correct signature
simulator = WebhookSimulator("http://localhost:9999/webhook")
event = {"id": "evt_test"}
# Mock to avoid connection error
with pytest.MonkeyPatch.context() as m:
mock_responses = [
MagicMock(status_code=200),
MagicMock(status_code=200),
]
call_count = [0]
def mock_post(*args, **kwargs):
response = mock_responses[call_count[0]]
call_count[0] += 1
return response
m.setattr(simulator.client, "post", mock_post)
responses = simulator.send_duplicate(event, count=2)
assert len(responses) == 2
simulator.close()
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