02-e2e-testing

Module 02 — End-to-End Testing

Write integration tests that run against the locally deployed stack — no mocking.

Prerequisite: Module 01 deployed (tflocal apply completed).

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Run the Tests

cd 02-e2e-testing
pip install -r requirements.txt
pytest tests/ -v

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Test Structure

02-e2e-testing/
├── tests/
│   ├── conftest.py          # shared fixtures (boto3 clients, API endpoint)
│   ├── test_order_flow.py   # happy path: create order → processed → receipt in S3
│   └── test_api.py          # API Gateway input validation
└── requirements.txt

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Key Ideas

• Tests talk to http://localhost:4566 — the same endpoint your app uses
• No mocking: real DynamoDB, real SQS, real S3
• Tests wait for async processing (SQS → Lambda) with a short poll loop
• If a test fails, the state is preserved — inspect with awslocal commands

# Inspect leftover state after a failed test
awslocal dynamodb scan --table-name orders
awslocal sqs get-queue-attributes \
  --queue-url http://localhost:4566/000000000000/orders-dlq \
  --attribute-names ApproximateNumberOfMessages

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Next: Module 03 — Lambda Debugging