Test suite

When building a complex contract ecosystem with multiple moving parts and dependencies, comprehensive testing is essential. This includes testing for both positive and negative scenarios. Positive tests should verify that each function's side effect is as expected, while negative tests should cover every revert, preferably in every logical branch.

The test coverage for this project should be expanded to include all contracts, not just surface-level functions. It is important to test the invariants required for ensuring security. Therefore, we recommend building a rigorous test suite that includes all contracts to ensure the system operates securely and as intended. This should also include additional test cases covering edge scenarios. For example, cases involving type conversions should be tested to ensure that potential overflows are properly handled.

Good test coverage has multiple effects.

• It finds bugs and design flaws early (preaudit or prerelease).

• It displays code maturity.

• It bolsters customer trust in your product.

• It improves understanding of how the code functions, integrates, and operates — for developers and auditors alike.

• It increases development velocity long-term.

The last point seems contradictory, given the time investment to create and maintain tests. To expand upon that, tests help developers trust their own changes. It is difficult to know if a code refactor — or even just a small one-line fix — breaks something if there are no tests. This is especially true for new developers or those returning to the code after a prolonged absence. Tests have your back here. They are an indicator that the existing functionality most likely was not broken by your change to the code.