Test Generator

What to test

1. Happy path — normal input produces expected output
2. Edge cases — empty, null, zero, max values, unicode, special chars
3. Error paths — invalid input, missing dependencies, network failures
4. Boundary conditions — off-by-one, pagination limits, timeout thresholds

What NOT to test

• Implementation details (private methods, internal state)
• Framework code (don't test that React renders a div)
• Trivial getters/setters with no logic

Structure per test

# Arrange — set up the inputs and dependencies
# Act — call the function/endpoint
# Assert — check the result matches expectations

Rules

• Test names describe the behavior: test_returns_empty_list_when_no_results
• One assertion per test (or one logical assertion group)
• Tests must be independent — no shared mutable state between tests
• Mock external services, not internal code
• If you need more than 5 lines of setup, the code is too coupled

Output

For each function/endpoint:

• 2-3 happy path tests
• 2-3 edge case tests
• 1-2 error path tests
• Each test with clear name, arrange/act/assert, and brief comment on what it verifies