When implementing complex business logic, state management, or algorithms with multiple edge cases, ensure comprehensive test coverage. Complex logic is prone to bugs and difficult to reason about during code review, making tests essential for maintainability and correctness.
Focus on:
Example from state management code:
// Instead of testing the entire complex state logic inline
initializeMessageStates: ({ inputCount, outputCount }) => {
// Complex state calculation logic here...
}
// Extract into testable utility functions
const calculateMessageStates = (inputCount: number, outputCount: number) => {
// Logic here - now easily testable
}
// Test the extracted function thoroughly
describe('calculateMessageStates', () => {
it('should handle edge case where counts exceed limits', () => {
// Test potential infinite loop scenario
})
})
This approach makes code review easier by allowing reviewers to focus on the test cases to understand the expected behavior, rather than trying to mentally trace through complex logic paths.
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