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How to mock at the descriptor level?

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0

It appears uuid4 is not mocked within the Field descriptor's initializer, but it is within Foo.get_uid. Why is this?

# file.py

from uuid import uuid4


class Field:

 def __init__(self, default):
 print(uuid4)
 self.default = default()

 def __get__(self, instance, owner):
 return self.default


class Foo:
 uid = Field(uuid4)

 def get_uid(self):
 print(uuid4)
 return self.uid

# test_file.py

import unittest
from unittest.mock import patch

from file import Foo


@patch("file.uuid4")
class TestFoo(unittest.TestCase):
 def test_get_uid(self, patched_uuid4):
 self.assertEqual(Foo().get_uid(), patched_uuid4())


if __name__ == "__main__":
 unittest.main()

Running python test_file.py results in:

<function uuid4 at 0x110923598>
<MagicMock name='uuid4' id='4570221984'>
F
======================================================================
FAIL: test_get_uid (__main__.TestFoo)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Users/peteralisandratos/.pyenv/versions/3.6.6/lib/python3.6/unittest/mock.py", line 1179, in patched
 return func(*args, **keywargs)
 File "test_file.py", line 10, in test_get_uid
 self.assertEqual(Foo().get_uid(), patched_uuid4())
AssertionError: UUID('a8273b4a-5d93-44d1-9041-54476e15fdf7') != <MagicMock name='uuid4()' id='4572959912'>

How can I get Field to respect the patch?

python mocking python-unittest

share|improve this question

asked Mar 24 at 17:04

PalisandPalisand

6831626

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The class definition, including the uid attribute is run on import. The patch is applied later and has no effect anymore. Use an instance attribute or patch Foo.uid.
  
  – Klaus D.
  Mar 24 at 17:43
  

  
  
  
  

add a comment | 

0

It appears uuid4 is not mocked within the Field descriptor's initializer, but it is within Foo.get_uid. Why is this?

# file.py

from uuid import uuid4


class Field:

 def __init__(self, default):
 print(uuid4)
 self.default = default()

 def __get__(self, instance, owner):
 return self.default


class Foo:
 uid = Field(uuid4)

 def get_uid(self):
 print(uuid4)
 return self.uid

# test_file.py

import unittest
from unittest.mock import patch

from file import Foo


@patch("file.uuid4")
class TestFoo(unittest.TestCase):
 def test_get_uid(self, patched_uuid4):
 self.assertEqual(Foo().get_uid(), patched_uuid4())


if __name__ == "__main__":
 unittest.main()

Running python test_file.py results in:

<function uuid4 at 0x110923598>
<MagicMock name='uuid4' id='4570221984'>
F
======================================================================
FAIL: test_get_uid (__main__.TestFoo)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Users/peteralisandratos/.pyenv/versions/3.6.6/lib/python3.6/unittest/mock.py", line 1179, in patched
 return func(*args, **keywargs)
 File "test_file.py", line 10, in test_get_uid
 self.assertEqual(Foo().get_uid(), patched_uuid4())
AssertionError: UUID('a8273b4a-5d93-44d1-9041-54476e15fdf7') != <MagicMock name='uuid4()' id='4572959912'>

How can I get Field to respect the patch?

python mocking python-unittest

share|improve this question

asked Mar 24 at 17:04

PalisandPalisand

6831626

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The class definition, including the uid attribute is run on import. The patch is applied later and has no effect anymore. Use an instance attribute or patch Foo.uid.
  
  – Klaus D.
  Mar 24 at 17:43
  

  
  
  
  

add a comment | 

It appears uuid4 is not mocked within the Field descriptor's initializer, but it is within Foo.get_uid. Why is this?

# file.py

from uuid import uuid4


class Field:

 def __init__(self, default):
 print(uuid4)
 self.default = default()

 def __get__(self, instance, owner):
 return self.default


class Foo:
 uid = Field(uuid4)

 def get_uid(self):
 print(uuid4)
 return self.uid

# test_file.py

import unittest
from unittest.mock import patch

from file import Foo


@patch("file.uuid4")
class TestFoo(unittest.TestCase):
 def test_get_uid(self, patched_uuid4):
 self.assertEqual(Foo().get_uid(), patched_uuid4())


if __name__ == "__main__":
 unittest.main()

Running python test_file.py results in:

<function uuid4 at 0x110923598>
<MagicMock name='uuid4' id='4570221984'>
F
======================================================================
FAIL: test_get_uid (__main__.TestFoo)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Users/peteralisandratos/.pyenv/versions/3.6.6/lib/python3.6/unittest/mock.py", line 1179, in patched
 return func(*args, **keywargs)
 File "test_file.py", line 10, in test_get_uid
 self.assertEqual(Foo().get_uid(), patched_uuid4())
AssertionError: UUID('a8273b4a-5d93-44d1-9041-54476e15fdf7') != <MagicMock name='uuid4()' id='4572959912'>

How can I get Field to respect the patch?

python mocking python-unittest

share|improve this question

asked Mar 24 at 17:04

PalisandPalisand

6831626

# file.py

from uuid import uuid4


class Field:

 def __init__(self, default):
 print(uuid4)
 self.default = default()

 def __get__(self, instance, owner):
 return self.default


class Foo:
 uid = Field(uuid4)

 def get_uid(self):
 print(uuid4)
 return self.uid

# test_file.py

import unittest
from unittest.mock import patch

from file import Foo


@patch("file.uuid4")
class TestFoo(unittest.TestCase):
 def test_get_uid(self, patched_uuid4):
 self.assertEqual(Foo().get_uid(), patched_uuid4())


if __name__ == "__main__":
 unittest.main()

<function uuid4 at 0x110923598>
<MagicMock name='uuid4' id='4570221984'>
F
======================================================================
FAIL: test_get_uid (__main__.TestFoo)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/Users/peteralisandratos/.pyenv/versions/3.6.6/lib/python3.6/unittest/mock.py", line 1179, in patched
 return func(*args, **keywargs)
 File "test_file.py", line 10, in test_get_uid
 self.assertEqual(Foo().get_uid(), patched_uuid4())
AssertionError: UUID('a8273b4a-5d93-44d1-9041-54476e15fdf7') != <MagicMock name='uuid4()' id='4572959912'>

share|improve this question

asked Mar 24 at 17:04

PalisandPalisand

6831626

share|improve this question

asked Mar 24 at 17:04

PalisandPalisand

6831626

asked Mar 24 at 17:04

PalisandPalisand

6831626

asked Mar 24 at 17:04

PalisandPalisand

6831626