The question is how to patch an attribute of an instance within a with statement. I tried with following example which doesn't work. It prints as in the comment.
from mock import patch, PropertyMock
class Foo(object):
f = {'a': 1}
new_foo = Foo()
with patch.object(new_foo, 'f', new_callable=PropertyMock) as mock:
mock.return_value = {'b': 2}
print new_foo.f
# <PropertyMock name='f' id='4474801232'>
There's an example in the documentation. You need to provide the class to patch.object, not the instantiated object.
from mock import patch, PropertyMock
class Foo(object):
f = {'a': 1}
new_foo = Foo()
with patch.object(Foo, 'f', new_callable=PropertyMock) as mock:
mock.return_value = {'b': 2}
print new_foo.f
print new_foo.f
Outputs:
{'b': 2}
{'a': 1}
patch, not patch.object. It's not really clear from that documentation when patch should be used vs. patch.object.config.py
class myClass(object):
def __init(self):
self.greeting = "hola"
test_first_test.py
from config import myClass
@patch.object(myClass, "greeting", "what up homie")
def test_one(self):
print (myClass.greeting)
Output:
what up homie
