Aman Singh developed a regression test for the AddColumnCommand parameter parsing in the OpenRefine repository, focusing on backend development and testing with Java. His work targeted the reliability of adding new columns by verifying correct handling of parameters such as the new column name, base column, expression, insertion index, and error handling strategy. By increasing test coverage for this workflow, Aman helped reduce the risk of regressions and supported faster, more reliable CI feedback. The depth of his contribution lay in aligning closely with issue #7310, ensuring that future changes to parameter parsing would maintain stability across OpenRefine releases.