Wojciech Piotrowiak worked on modernizing the test infrastructure for the Activiti/Activiti repository, focusing on upgrading test mocks from deprecated MockBean and SpyBean annotations to the newer MockitoBean approach in line with recent Spring Boot testing utilities. Using Java and Mockito, he attempted to streamline and future-proof the test suite, but encountered incompatibilities within the activiti-core module. To maintain repository stability and prevent regressions, he restored the previous test mocks, ensuring the test suite remained reliable. His work demonstrated careful version control, a strong understanding of testing frameworks, and a methodical approach to cross-module changes within a complex codebase.