twisted/conch/test/test_recvline.py stdio loopback tests set up child environment in a problematic way

New submission from exarkun <[email protected]>:

`_StdioMixin.setUp` launches a child process for the tests to interact with.  It creates the child with a very minimal environment, though.  This causes issues for !PyPy, which relies on ctypes to provide certain modules; ctypes, in turn, requires that `objdump` be on the `PATH` and fails grossly when it is not.

More generally, it's a bit optimistic to expect that semi-arbitrary programs (eg !CPython or !PyPy) beyond our control will work properly with such a minimal environment.  Reproducing the entire parent environment is probably a better idea.


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Type     : defect
Component: conch
Keywords : 
Priority : normal
Nosy     : 
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http://twistedmatrix.com/trac/ticket/4203