Pytest与模拟/ pytest模拟

Question

由于某些原因，我不能让mock.patch在任何情况下使用Pytest工作。它根本不做补丁。我是不是正确使用它，或者是我的配置搞砸了？

base.py

def foo(): 
    return 'foo' 

def get_foo(): 
    return foo() 

test_base.py

import pytest 
import mock 
from pytest_mock import mocker 

from base import get_foo 

@mock.patch('base.foo') 
def test_get_foo(mock_foo): 
    mock_foo.return_value = 'bar' 
    assert get_foo() == 'bar' 

def test_get_foo2(mocker): 
    m = mocker.patch('base.foo', return_value='bar') 
    assert get_foo() == 'bar' 

def test_get_foo3(): 
    with mock.patch('base.foo', return_value='bar') as mock_foo: 
     assert get_foo() == 'bar' 

pytest导致

============================================================= test session starts ============================================================= 
platform linux2 -- Python 2.7.13, pytest-3.0.7, py-1.4.33, pluggy-0.4.0 
rootdir: /projects/git/ABC/query, inifile: 
plugins: mock-1.6.0 
collected 13 items 

test_base.py .....FFF..... 

================================================================== FAILURES =================================================================== 
________________________________________________________________ test_get_foo _________________________________________________________________ 

mock_foo = <MagicMock name='foo' id='140418877133648'> 

    @mock.patch('base.foo') 
    def test_get_foo(mock_foo): 
     mock_foo.return_value = 'bar' 
>  assert get_foo() == 'bar' 
E  AssertionError: assert 'foo' == 'bar' 
E   - foo 
E   + bar 

test_base.py:67: AssertionError 
________________________________________________________________ test_get_foo2 ________________________________________________________________ 

mocker = <pytest_mock.MockFixture object at 0x7fb5d14bc210> 

    def test_get_foo2(mocker): 
     m = mocker.patch('base.foo', return_value='bar') 
>  assert get_foo() == 'bar' 
E  AssertionError: assert 'foo' == 'bar' 
E   - foo 
E   + bar 

test_base.py:71: AssertionError 
________________________________________________________________ test_get_foo3 ________________________________________________________________ 

    def test_get_foo3(): 
     with mock.patch('base.foo', return_value='bar') as mock_foo: 
>   assert get_foo() == 'bar' 
E   AssertionError: assert 'foo' == 'bar' 
E    - foo 
E    + bar 

test_base.py:75: AssertionError 

Answer 1

的问题是由于我的导入规范和PATH变量之间的关系。如果我在patch参数中指定了整个路径，如：@mock.patch('<PROJECT_ROOT>.<SUBPACKAGE>.base.foo')其中PATH的父目录是一个条目，那么它就起作用了。我不知道为什么它没有找到base.foo而不是抛出导入错误。如果它没有找到它，我不明白范围是如何不同的。