It is a single file with about one hundred lines. Just copy/paste it locally and include into your test project.
Set up permanent customizations per type to be always applied on-the-fly to objects being created. Define and apply additional ad-hoc customizations specific to particular test case.
Works with any existing unit-testing frameworks as well as data generation libraries.
"OK. Show me the code."
For quick introduction you may want to refer to Getting Started wiki page.
Well-known and respected:
- NBuider | https://code.google.com/p/nbuilder
- AutoFixture | http://autofixture.codeplex.com
- AutoPoco | http://autopoco.codeplex.com