Automated Test Suite — Team Transition Brief

A QA engineer who has been building a new automated test suite for a payment processing service is moving to another team. Before leaving they need to make sure someone else can continue improving coverage. You need to write a document that enables their replacement to take over immediately.

Background

The payment service handles three main flows: checkout, refund, and subscription renewal. The QA engineer was tasked with achieving 80% branch coverage across all three flows.

What has been completed

• Checkout flow: 47 test cases written covering happy path, card decline, and network timeout scenarios; all passing
• Refund flow: 12 test cases written covering full and partial refunds; all passing
• Test framework: Pytest with the responses library for HTTP mocking and factory_boy for fixture generation; configuration in pytest.ini and tests/conftest.py
• CI integration: tests run automatically on every pull request via .github/workflows/tests.yml
• Coverage report baseline recorded: checkout 83%, refund 61%, subscription renewal 0%

What is not yet started

• Subscription renewal flow: no tests written at all
• Edge cases for refund flow: currency conversion during refund and partial refund on a partially-shipped order are not covered
• The tests/fixtures/ folder has placeholder files but no real fixture data

Context the replacement needs to know

• Subscription renewal logic lives in src/billing/renewal.py and calls an external billing provider (BillingProvider class in src/billing/provider.py)
• The BillingProvider class must be mocked in tests; the actual provider SDK is not available in the test environment and will throw if called directly

Write a document that allows the replacement QA engineer to continue this work.