Write good tests and define integration tests

Q: Write good tests and define integration tests

This is a Software Engineering Fundamentals interview question from Fidelity for Software Engineer roles. View the full question and solution on PracHub.

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Question

Test Design: Definitions, Trade-offs, and Best Practices

Context

You're building a small service for a take-home project (e.g., a REST API with a database and a third-party dependency like a payment gateway). Explain how you would design a reliable test suite.

Tasks

Define the layers of automated testing:
- Unit tests
- Integration tests
- End-to-end (E2E) tests
Explain the purpose and scope of integration testing (what to include/avoid, boundaries, and when to use it).
Discuss isolation vs. realism in tests and how to balance them.
Describe test fixtures (what they are, types, and good practices).
Explain determinism in tests and how to ensure it.
List common causes of flaky tests and how to prevent/fix them.
Provide concrete examples throughout.

Write good tests and define integration tests

Test Design: Definitions, Trade-offs, and Best Practices

Context

Tasks

Solution (Locked)

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