Hi,
I just ran into an annoying problem trying to run an individual test file.  It 
seems we have broken the ability to run tests one file at a time using 
PYTHONPATH to supply the location of the pygr libraries.  Say I want to run the 
tests from a specific library directory, e.g.

Administrators-Computer-5:pygr leec$ export 
PYTHONPATH=~/projects/pygr/build/lib.macosx-10.6-i386-2.6

If I run
python2.6 runtests.py
it dies because it insists on trying to use the source directory instead of my 
PYTHONPATH.  However, I can instead run it with the -b option to make it figure 
out the right build/lib... directory automatically.  That works.

However, if I try to run a single test file, I hit a catch-22.  If I don't give 
the -b flag, it dies because it insists on using the source directory:

Administrators-Computer-5:tests leec$ python2.6 worldbase_test.py
worldbase_test.py:2: DeprecationWarning: the md5 module is deprecated; use 
hashlib instead
  import md5
INFO pathfix.<module>: importing pygr from 
/Users/leec/projects/pygr/pygr/__init__.pyc

    Importing pygr from source directory /Users/leec/projects/pygr

    Error: 'cannot import name cnestedlist'

But if I do give the -b flag, now it dies because the individual test file 
doesn't recognize that as an acceptable option:

Administrators-Computer-5:tests leec$ python2.6 worldbase_test.py -b
worldbase_test.py:2: DeprecationWarning: the md5 module is deprecated; use 
hashlib instead
  import md5
INFO pathfix.<module>: importing pygr from 
/Users/leec/projects/pygr/build/lib.macosx-10.6-i386-2.6/pygr/__init__.py
option -b not recognized
Usage: worldbase_test.py [options] [test] [...]

I see two problems here:

- a developer should always have the ability to override the default testing 
paths, and PYTHONPATH is the standard way to do it.  That should always work, 
and it certainly used to work -- I frequently ran individual test files that 
way.  The current version of tests/testlib/pathfix.py has broken this.

- it seems we need to unify command line option processing for individual test 
files like worldbase_test.py with testlib/testoptions.py

Testing gods (Titus), what do you recommend?

-- Chris

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