Easily solved. Do the following:
1)
in ./pytest.ini and ./rpython/pytest.ini 
change assert=reinterp to assert=rewrite. It turns out in the latest version of pytest assert=reinterp is no longer supported
2)
comment out the following lines from ~/pypy/pypy/tool/pytest/appsupport.py

#try:
#    from _pytest.assertion.reinterpret import reinterpret as interpret
#except ImportError:
#    from _pytest.assertion.newinterpret import interpret

# _____
 


On Saturday, November 26, 2016 8:04 AM, Shubha Ramani <shubharamani@yahoo.com> wrote:


pypy not puppy (spell-check woes)
 


On Saturday, November 26, 2016 8:03 AM, Shubha Ramani via pypy-dev <pypy-dev@python.org> wrote:


For instance this command :
usage: py.test [options] [file_or_dir] [file_or_dir] [...]
py.test: error: argument --assert: invalid choice: 'reinterp' (choose from 'rewrite', 'plain')
 

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