New issue 720: Allow testing of bytecode-only modules in Python 3
https://bitbucket.org/pytest-dev/pytest/issue/720/allow-testing-of-bytecode-only-modules-in
Mike Müller:
I am testing another programming language that eventually emits Python 3 (or
PyPyp 3) bytecode. I would like to use `pytest` for testing. When I import
`*.pyc` file somewhere in my test I get this error message:
```
#!shell
from factorial import factorial
<frozen importlib._bootstrap>:2237: in _find_and_load
???
<frozen importlib._bootstrap>:2222: in _find_and_load_unlocked
???
<frozen importlib._bootstrap>:2160: in _find_spec
???
<frozen importlib._bootstrap>:2141: in _find_spec_legacy
???
.../site-packages/_pytest/assertion/rewrite.py:75: in find_module
fn = imp.source_from_cache(fn)
..../lib/python3.4/imp.py:100: in source_from_cache
return util.source_from_cache(path)
<frozen importlib._bootstrap>:479: in source_from_cache
???
E ValueError: __pycache__ not bottom-level directory in
'.../tests/factorial.pyc'
```
I pinned down the problem in the file `assertion/rewrite.py`. This is the code
that causes the exception (starting form line 73):
```
#!python
if tp == imp.PY_COMPILED:
if hasattr(imp, "source_from_cache"):
fn = imp.source_from_cache(fn)
else:
fn = fn[:-1]
elif tp != imp.PY_SOURCE:
# Don't know what this is.
return None
```
My very programmatic, and probably wrong, solution ist to return `None`
if this exception occurs:
```
#!python
if tp == imp.PY_COMPILED:
if hasattr(imp, "source_from_cache"):
try:
fn = imp.source_from_cache(fn)
except ValueError:
return None
else:
fn = fn[:-1]
```
Is there another way to make bytecode-only files work?
Could my solution above serve as a basis for a real solution?
Maybe a command line option that switches on and off the behavior I want
can be useful here.
These are my versions:
```
platform darwin -- Python 3.4.3 -- py-1.4.26 -- pytest-2.7.0
plugins: xdist
```
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