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如何将需要参数的异常作为模拟side_effects传递？

我正在尝试测试boto.exception.EC2ResponsError的assertRaises,但在_mock_call中获取"TypeError:init()至少需要3个参数(1给定)".

@mock_ec2
@patch.object(Ec2Region, 'connect')
def test_ec2_get_raises(self, mock_connect):
    conn = boto.connect_ec2()
    mock_connect.return_value = conn
    reservation = conn.run_instances('ami-1234abcd')
    instance = reservation.instances[0]
    Ec2Instance.objects.create(region=self.region, account=self.account,
                               instance_id=instance.id)
    mock_connect.side_effect = boto.exception.EC2ResponseError
    self.assertRaises(
        boto.exception.EC2ResponseError,
        Ec2Instance.ec2_get, self.account, self.region)

我得到的错误是这样的:

======================================================================
ERROR: test_ec2_get_raises (session_ec2.tests.test_instance.Ec2InstanceTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/bschott/.virtualenvs/session-ec2/lib/python2.7/site-packages/moto/core/models.py", line 70, in wrapper
    result = func(*args, **kwargs)
  File "/Users/bschott/.virtualenvs/session-ec2/lib/python2.7/site-packages/mock.py", line 1201, in patched
    return func(*args, **keywargs)
  File "/Users/bschott/Source/session-ec2/session_ec2/tests/test_instance.py", line 84, in test_ec2_get_raises
    Ec2Instance.ec2_get, self.account, self.region)
  File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/unittest/case.py", line 475, in assertRaises
    callableObj(*args, **kwargs) …