Question

我正在从official docs学习pytest，并找到了适合我需要的示例。我键入以下代码，在文件中运行pytest，我没有失败

import os.path

def getssh(): # pseudo application code
    return os.path.join(os.path.expanduser("~admin"), '.ssh')

def test_mytest(monkeypatch):
    def mockreturn(path):
        return 'C:\\Users\\Admin\\'
    monkeypatch.setattr(os.path, 'expanduser', mockreturn)
    x = getssh()
    assert x == "C:\\Users\\Admin\\.ssh"

但是当我采用上面的代码来处理真正的应用程序代码时，即

import random

def _mkRandom(low_lim, high_lim):
    """ generates a random number between given limits
    NOTE: sometimes the random number generated is so low
    that even after multiplication it remains smaller than
    lower limit, this function tries to handle such cases also.
    """
    x = random.random()
    x = x*high_lim
    if x<low_lim:
        print("Special case encountered")
        x+= low_lim
    return x

def test_mkRandom(monkeypatch):
    def mockreturn(low, high):
        return 0.001
    monkeypatch.setattr(random, "random", mockreturn)
    x = _mkRandom(1, 2)
    assert x == 1.002
    return

我收到以下错误：

================================== FAILURES ===================================
________________________________ test_mkRandom ________________________________

monkeypatch = <_pytest.monkeypatch.MonkeyPatch object at 0x027DB330>

    def test_mkRandom(monkeypatch):
        def mockreturn(low, high):
                return 0.001
        monkeypatch.setattr(random, "random", mockreturn)
>       x = _mkRandom(1, 2)

monkey.py:22:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

low_lim = 1, high_lim = 2

    def _mkRandom(low_lim, high_lim):
        """ generates a random number between given limits
        NOTE: sometimes the random number generated is so low
        that even after multiplication it remains smaller than
        lower limit, this function handles such cases also.
        """
>       x = random.random()
E    TypeError: mockreturn() missing 2 required positional arguments: 'low' and 'high'

monkey.py:11: TypeError
===================== 1 failed, 1 passed in 0.16 seconds ======================

如何正确测试_mkRandom？

pytest-如何monkeypatch需要1+参数的函数

0 个答案: