New issue 603: monkeypatch does not work on already-imported function
https://bitbucket.org/hpk42/pytest/issue/603/monkeypatch-does-not-work-on-already
Marco Chomut:
Given the following tests file:
```
#!python
from project.main import foo
def test_foo(monkeypatch):
monkeypatch.setattr('project.bar.zoo', lambda x: 0)
assert foo() == 0
```
And this system under test:
```
#!python
# project/main.py
from project.bar import zoo
def foo():
return zoo('lion')
```
```
#!python
# project/bar.py
def zoo(animal):
if animal == 'lion':
return 7
```
Then the ``zoo`` that's already been imported in ``main.py`` remains unpatched.
Moving the imports around to be local to the test function would fix the
problem, unless ``main.py`` is imported by other files at any point during the
test suite running. Alternatively, if ``main.py`` instead does ``import
project.bar`` and calls its dependency with ``project.bar.zoo('lion')``, then
the test passes again. But this is cumbersome and difficult to enforce across
an entire project.
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