Python模拟UnitTest和数据库

时间:2014-04-09 13:06:59

标签: python unit-testing mocking

我想在我的代码中测试一个方法时发出数据库调用。我想要它做的就是回报我的价值观,但我似乎无法做到那么远。

def loadSummary(appModel):
    stmt = 'Select * from Table'
    for row in appModel.session.query(*t.columnNames()).from_statement(stmt).all():
        t.append(row)
    return t

def test_loadSummary(self):
    appModel = Mock()
    query = appModel.session.query.return_value
    query.from_statment.return_value = ['test1', 'test2']
    expected = loadSummary(appModel)

我收到以下错误

for row in appModel.session.query(*t.columnNames()).from_statement(stmt).all():
TypeError: 'Mock' object is not iterable

所以就像它没有被传递到方法中一样,即使它在shell中工作没问题。

>>> appModel.session.query('').from_statment('stmt')
['test1', 'test2']

然后我尝试使用mock.patch.object

class MockAppContoller(object):
    def from_from_statement(self, stmt):
        return ['test1', 'test2']

def test_loadSummary(self):
    with mock.patch.object(loadSummary, 'appModel') as mock_appModel:
        mock_appModel.return_value = MockAppContoller()

我收到以下错误

2014-04-09 13:20:53,276 root ERROR Code failed with error:
<function loadSummary at 0x0D814AF0> does not have the attribute 'appModel'

如何解决这个问题?

2 个答案:

答案 0 :(得分:2)

您的错误似乎在这里:

 query.from_statment.return_value = ['test1', 'test2']

应该是:

 query.from_statement.return_value.all.return_value = ['test1', 'test2']

它适用于你的shell,因为你没有使用相同的代码

>>> appModel.session.query('').from_statement('stmt')
['test1', 'test2']

如果你真的尝试

会失败
>>> appModel.session.query('').from_statment('stmt').all()
['test1', 'test2']

答案 1 :(得分:0)

我想出的另一个解决方案是这个,但它不像使用Mock那样整洁

class mockAppModel(object):
    def from_from_statement(self, stmt):       
        t = []
        t.appendRow('row1', 'row2')
        return t

class mockFromStmt(object): #This is the ONE parameter constructor
    def __init__(self):
        self._all = mockAppModel()

    def all(self):  #This is the needed all method
        return self._all.from_from_statement('')

class mockQuery(object): #This is the ONE parameter constructor
    def __init__(self):
        self._from_statement = mockFromStmt()

    def from_statement(self, placeHolder): #This is used to mimic the query.from_statement() call
        return self._from_statement 

class mockSession(object):
    def __init__(self):
        self._query = mockQuery()

    def query(self, *args):  #This is used to mimic the session.query call
        return self._query

class mockAppModel(object):
    def __init__(self):
        self.session = mockSession()