Python,Py。测试:如何包含另一个类的局部函数,而不是py。测试?

我的测试模块中有:

import pytest
from src.model_code.central import AgentBasic

class AgentBasicTestee(AgentBasic):
    pass

@pytest.fixture()
def agentBasic():
    return AgentBasicTestee()

@pytest.mark.parametrize('alpha, beta, delta, expected', [
    (2, 1, 1, pytest.approx(1)),
])  
def test_a1(agentBasic, alpha, beta, delta, expected):
    assert(agentBasic.a1(alpha, beta, delta,) == expected)

在我的导入模块中

from src.model_code.crra_utility import AgentCrra
AgentCOne = AgentCrra

class AgentBasic:
   @staticmethod      
   def a1(alpha, beta, delta):
       k = AgentCOne.k_bar(alpha, beta, delta)
       return beta * alpha * (
               alpha - 1) * k ** (alpha - 1)

我收到的错误消息是: > k = AgentCOne.k_bar(alpha, beta, delta) E TypeError: k_bar() missing 1 required positional argument: 'delta'

编辑:

class AgentCrra:
    def k_bar(self, alpha, beta, delta):
        """non-stochastic steady-state for capital"""
        return ((1 / beta - 1 + delta) / alpha) ** (1 / (alpha - 1))

到目前为止,self接受了我的一个参数s.t.delta保持为空。。。