ABLUnit and OEUnit are frameworks that you can use for writing repeatable tests for ABL sources. Progress Developer Studio for OpenEdge (PDS for OpenEdge) 11.4 introduced ABLUnit, a unit testing framework based on the xUnit framework for writing repeatable tests for ABL sources. This feature was then enhanced in OpenEdge 11.5 and 11.6. This document compares and contrasts the features between OEUnit and ABLUnit, and discusses in detail how to migrate from OEUnit to ABLUnit.