Integration & End-to-End Testing — quiz

A checkout flow spans Cart, Inventory, Payment, and Notification services. Running all four together in E2E tests is slow and flaky. What is the recommended strategy?

• Use only unit tests for all four services to keep the suite fast and reliable
• Use pairwise integration tests to verify the seams between adjacent services, and reserve E2E tests for the critical golden path only — reducing scope while still verifying the full flow exists
• Replace all integration tests with E2E tests to get broader coverage per test run
• Remove the Notification Service from all tests since it is non-critical to the transaction