Dmytro Lychak focused on refining the DynamoRevit test suite to improve regression reliability during model upgrades. Working within the DynamoDS/DynamoRevit repository, he updated the DynamoAllSelectionNodeTests_WithPreSelectedEntities test to accurately assert element counts after architectural changes, specifically addressing the relationship between mullions and host curtain walls. Using C#, the Revit API, and unit testing frameworks, Dmytro ensured that test logic reflected new model behaviors, reducing false failures and streamlining validation cycles. His work demonstrated careful attention to architectural detail and regression coverage, resulting in more robust software testing practices and increased confidence in release quality for upgraded Revit models.