test isolation: default ignores & repository acquisition

[Vincent Ladeuil]

>>>>> "robert" == Robert Collins <robertc at robertcollins.net> writes:

    robert> We've got two significant things with test isolation that cause some
    robert> overhead/work in the test suite.

    robert> Firstly is the defaut ignores.

<snip/>

    robert> Tests that test the management of default ignores
    robert> would reset that hook and use an overridden homedir.
    robert> Any thoughts on this?

+1

But there were also a discussion about a way for bzr-git/bzr-hg
to override the whole ignore handling, it may be worth checking
if you can kill two birds with the same stone.

<snip/>

    robert> I propose the following test classes:
    robert> TestCase:
    robert>  - isolates environment variables

    robert>  - has facilities for transports and servers, defaulting to
    robert>    all memory and no local disk
    robert>  - hooks and isolates the default ignores

Go ahead, tell us clearly that you would implement a pseudo file
system in memory ! :D

I'm fine with having more focused test base classes, I think we
need to create *more* test classes in the tests themselves
anyway, one class by test being the extreme, we are actually
closer to using a single class by test file, which is bad. 

Using more, better focused, test classes helps writing good setUp
methods which in turn give simpler test methods.

       Vincent