Imtiar J. enhanced calculation reliability in the yamada-ui/yamada-ui repository by developing targeted test coverage for arithmetic operations involving negation with addition. Focusing on TypeScript and leveraging robust testing practices, Imtiar introduced a dedicated test case to verify the correct handling of negated summed values, addressing potential edge cases and guarding against future regressions in arithmetic logic. The work involved expanding the existing test suite to ensure that the negate functionality operates as intended when combined with addition. This contribution deepened the reliability of the codebase, reflecting a methodical approach to quality assurance and a strong command of TypeScript testing.