Add tests and impementation to create sample engineers. Note that singleton is causing race conditions, so need to limit access to it within tests.
Add failing viewcontroller test that button is connected to handleCreateButton (not created yet).
Implement button handler connection to pass failing test. Need to add functionality and tests next...
Add failing viewcontroller test that handleCreateButton creates 4 engineers.
Oops, that functionality already tested, removing last test since there isn't a reasonable way to test that. The button is connected to the handler, and the handler was tested, but it isn't easy or needed to test the 2 togethers. Might be a great KIF test though.
Created EngineerStore saveChanges method to write archive out. Did not create a test for this, but a class mock could be used to do this...