How to have unittest tests to be executed in the order they appear?

[Roy Smith]

Ben Finney <bignose+hates-spam at benfinney.id.au> wrote:

> Surely, since "suddenly" implies you changed one small area of the
> code, that area of the code is the best place to look for what caused
> the failure.

Sometimes it's the environment that's changed.  Yes, I know, a good unit 
test doesn't depend on the environment, but in real life, that's sometimes 
difficult to achieve.