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[dpb dpb]

Sorry, I hit send too soon. Though it's not essential to the question, the
second program should read:

# display_class_attributes.py


> """Test the setting of class attributes."""


> class TestExample():
>     def __init__(self):
>         self.attribute = 1


>     def test_changing_attr(self):
>         """Change attribute on object."""
>         self.attribute = 2
>         print('self.attribute == 2:', self.attribute == 2)


>     def test_attr_is_changed(self):
>         """Assume attribute is changed."""
>         print('self.attribute == 2:', self.attribute == 2)


>     def test_attr_is_unchanged(self):
>         """Assume attribute is unchanged."""
>         print('self.attribute == 1:', self.attribute == 1)


> t = TestExample()
> t.test_changing_attr()
> t.test_attr_is_changed()
> t.test_attr_is_unchanged()


Output:

$ python display_class_attributes.py
> self.attribute == 2: True
> self.attribute == 2: True
> self.attribute == 1: False
> $


- dpb

On Sun, Mar 29, 2015 at 4:57 AM, dpb dpb <dpb.mediamath at gmail.com> wrote:

> Something I do not see addressed explicitly in the Pytest docs is this
> behavior: Unlike normal class writing in Python 3, changing the value of a
> class attribute in one function does not leave it changed in test functions
> that are called subsequently:
>
> # test_pytest_class_attributes.py
>> """Test the setting of class attributes."""
>> class TestExample():
>>     def setup(self):
>>         self.attribute = 1
>
>
>>     def test_changing_attr(self):
>>         """Change attribute on object."""
>>         self.attribute = 2
>>         assert self.attribute == 2
>
>
>>     def test_attr_is_changed(self):
>>         """Assume attribute is changed."""
>>         assert self.attribute == 2
>
>
>>     def test_attr_is_unchanged(self):
>>         """Assume attribute is unchanged."""
>>         assert self.attribute == 1
>
>
> Output:
>
> $ py.test test_pytest_class_attributes.py -v
>> ============================= test session starts
>> ==============================
>> platform darwin -- Python 3.4.1 -- py-1.4.25 -- pytest-2.6.3 --
>> /Users/dpb/py34/bin/python3.4
>> collected 3 items
>> test_pytest_class_attributes.py::TestExample::test_changing_attr PASSED
>> test_pytest_class_attributes.py::TestExample::test_attr_is_changed FAILED
>> test_pytest_class_attributes.py::TestExample::test_attr_is_unchanged
>> PASSED
>> =================================== FAILURES
>> ===================================
>> _______________________ TestExample.test_attr_is_changed
>> _______________________
>> self = <test_pytest_class_attributes.TestExample object at 0x10dd98ef0>
>>     def test_attr_is_changed(self):
>>         """Test whether attribute is changed."""
>> >       assert self.attribute == 2
>> E       assert 1 == 2
>> E        +  where 1 = <test_pytest_class_attributes.TestExample object at
>> 0x10dd98ef0>.attribute
>
>
>
> test_pytest_class_attributes.py:14: AssertionError
>> ====================== 1 failed, 2 passed in 0.02 seconds
>> ======================
>> $
>
>
> Is there special syntax or some special structure to make class attributes
> behave In Pytest as they do in an ordinary Python class? Example:
>
> # display_class_attributes.py
>> """Test the setting of class attributes."""
>
>
>> class TestExample():
>>     def __init__(self):
>>         self.attribute = 1
>
>
>>     def test_changing_attr(self):
>>         """Change attribute on object."""
>>         self.attribute = 2
>>         assert self.attribute == 2
>>         print('Finished test_changing_attr.\n')
>
>
>>     def test_attr_is_changed(self):
>>         """Test whether attribute is changed."""
>>         assert self.attribute == 2
>>         print('Finished test_attr_is_changed.\n')
>
>
>>     def test_attr_is_unchanged(self):
>>         """Test whether attribute is unchanged."""
>>         assert self.attribute == 1
>>         print('Finiahed test_attr_is_unchanged.\n')
>
>
>> t = TestExample()
>> t.test_changing_attr()
>> t.test_attr_is_changed()
>> t.test_attr_is_unchanged()
>
>
> Output:
>
> > $ python display_class_attributes.py
> >
> > self.attribute == 2: True
> >
> > self.attribute == 2: True
> >
> > self.attribute == 1: False
> >
> > $
>
> Thanks.
>
> - dpb
>
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