What's changed: New GH-300 Chapter 5 (productivity & quality = code gen/refactor/docs, accelerated learning/less switching, sample data, legacy modernization with semantic-equivalence checks; testing & security = unit/integration tests/edge cases/assertions, security/performance suggestions are suggestions not guarantees, validating outputs)
5.2Supporting Testing and Security
Understand using Copilot to generate unit/integration tests, identify edge cases and write assertions, and suggest security improvements and performance optimizations—along with the need to validate.
Testing and security are key to quality. Copilot can accelerate them via generating tests, identifying edge cases, and suggesting security improvements and performance optimizations. But per Chapter 1, generated tests and suggestions themselves need validation—a wrong test gives no assurance, and an inappropriate security suggestion can backfire.
5.2.1Unit/integration tests and edge cases
Copilot can propose unit test scaffolds/cases from a target function or module and help author integration test scenarios. Especially useful is identifying edge cases (boundaries, error paths, empty inputs, exceptions) that humans often miss. For generated assertions (checking expected values), humans confirm the expected values are truly correct. What matters is "covering correct, meaningful cases" more than "increasing the count," and generated tests are reviewed too.
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