Write Tests

Required Pre-Writing Analysis

Before writing tests, answer:

1. •What is the core logic or algorithm?
2. •What are the inputs and outputs, including edge/boundary/invalid cases?
3. •What invariants must always hold?
4. •What failure modes are realistic (bad data, misuse, race conditions)?

Test Rules

• •Test behavior, not implementation details.
• •Minimize mocking; mock only true external dependencies.
• •Avoid tautological tests (mock X, assert X with no logic in between).
• •Exercise real branches and error paths.
• •Use concrete, realistic data.
• •Name tests with clear hypotheses.

Verification Checklist

• •Could each test fail if corresponding logic were broken?
• •Are core decisions being tested, not only wiring?
• •Are happy path, edge cases, error conditions, and boundaries covered?
• •If mocks were removed, would meaningful logic remain under test?

Output

1. •Present the pre-writing analysis.
2. •Add/update tests based on that analysis.
3. •Run tests and confirm pass/fail status.
4. •Report the verification checklist with conclusions.