Question

有FooObject个课程，只有一个version字段和一个update()方法。

class FooObject(models.Model):
  version = models.CharField(max_length=100)

我想使用Python的update工具覆盖unittest的Mock方法。我该怎么办？我应该使用patch吗？

foo_object.update = Mock(self.version = '123')

Answer 1

要做到这一点，您可以使用@patch来模拟类函数

from mock import patch

# Our class to test
class FooObject():
    def update(self, obj):
        print obj

# Mock the update method
@patch.object(FooObject, 'update')
def test(mock1):
    # test that the update method is actually mocked
    assert FooObject.update is mock1
    foo = FooObject()
    foo.update('foo')
    return mock1

# Test if the mocked update method was called with 'foo' parameter
mock1 = test()
mock1.assert_called_once_with('foo')

你甚至可以模仿更多这样的功能：

from mock import patch

class FooObject():
    def update(self, obj):
        print obj

    def restore(self, obj):
        print obj

@patch.object(FooObject, 'restore')
@patch.object(FooObject, 'update')
def test(mock1, mock2):
    assert FooObject.update is mock1
    assert FooObject.restore is mock2
    foo = FooObject()
    foo.update('foo')
    foo.restore('bar')
    return mock1, mock2

mock1, mock2 = test()
mock1.assert_called_once_with('foo')
mock2.assert_called_once_with('bar')

Python：使用Mock覆盖类方法

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