Add tests for fetch_new, switch, and update
Add tests for fetch_new, switch, and update

sbidoul/pip,pfmoore/pip,pypa/pip,pypa/pip,xavfernandez/pip,rouge8/pip,xavfernandez/pip,sbidoul/pip,rouge8/pip,pfmoore/pip,rouge8/pip,pradyunsg/pip,xavfernandez/pip,pradyunsg/pip