Ivan Tustinov refactored the Russian Nouns JS test infrastructure in the grafana/k6-DefinitelyTyped repository, focusing on improving reliability and maintainability. He removed custom assertion logic from the tests, opting instead for direct result assignment and enhanced property logging. This approach simplified the test code, reduced flaky behavior, and made test outcomes clearer during continuous integration runs. Working primarily with TypeScript and leveraging his skills in testing, Ivan’s changes streamlined the feedback process for developers and lowered ongoing maintenance costs. The work addressed project quality goals by making the test suite more robust and easier to understand for future contributors.