resolves issue #48
Have the path.pyimport() helper raise an EnvironmentError if an
import of a given file returns a module that does not appear to
be coming from the actual path. E.g. for a directory layout like this:
a / test_whatever.py
b / test_whatever.py
calling py.path.local("b/test_whatever.py").pyimport() will
fail if the other globally scoped test_whatever module was
loaded already.
--HG--
branch : trunk
86fc12dd15