Abstract: A test library for use with a database storage system such as WinFS provides users with a WinFS schema agnostic way to test the WinFS store application programming interfaces (APIs) and to use the WinFS store APIs to populate the WinFS store with randomly generated data. The WinFS test library provides users with an object layer that they can program against to carry out multiple tasks on the WinFS store. Tests can use the WinFS test library to generate schema-agnostic tests that do not break if a schema is changed or removed. For instance, a user can create a WinFS schema and install it in a WinFS store. The WinFS test library will automatically validate that the schema and all of its declared types are properly installed in the store. It will also generate instances of each type, set randomly generated values for every property including nested types, call the store API to create them in the store, and then select values from the store and validate that they were set property.