如何为无参数方法自动生成测试用例？

Question

为了减少样板代码，我想到了在 class 测试器中为所有无参数方法生成测试用例的想法。

在运行py.test上，它只识别静态编写的测试用例（test_a，test_b），但不识别使用setattr(Tester,'test_' + name, member)

动态创建个测试用例

也许 py.test 在调用 setUpClass 之前已经检查了 class Tester 是否有 'test_*' 的方法？任何提示如何得到这个运行?

import inspect
import unittest


class Testee:
    def a(self):
        print('a')

    def b(self):
        print('b')    

    #...

    #...
    def z(self):
        print('z')

class Tester(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        testee = Testee()
        for name, member in inspect.getmembers(object=testee, predicate=inspect.ismethod or inspect.iscoroutine):
            if len(inspect.signature(member).parameters):
                print(str(inspect.signature(member).parameters))
                setattr(Tester,'test_' + name, member)
            if inspect.isfunction(member) or inspect.ismethod(member):
                setattr(Tester,'test_' + name, member)
            elif inspect.iscoroutinefunction(member):
                setattr(Tester,'test_' + name, functools.partialmethod(TestInstrument.run_coro, member))
            else:
                print(member)
        return super().setUpClass()

    def test_a(self):
        Tester.testee.a()

    def test_b(self):
        Tester.testee.b()

============================= test session starts ============================= platform win32 -- Python 3.5.1, pytest-2.9.2, py-1.4.31, pluggy-0.3.1 -- c:\program files\python35\python.exe cachedir: .cache rootdir: C:\tests, inifile: collected 2 items

sandbox.py::Tester::test_a PASSED sandbox.py::Tester::test_b PASSED

========================== 2 passed in 0.03 seconds ===========================

编辑：如果我将 setupClass 中的代码移动到全局范围（class 之外），那么 py.test 会检测并运行自动生成的测试用例。

Answer 1

为了详细说明我的 'EDIT'，一种选择是这样。我对该解决方案不满意，因为全局代码执行会对 side-effects 和其他细微错误开放。关于如何将其纳入 class Tester 范围的任何建议？

import inspect
import unittest
import functools
def auto_generate_test_cases(Tester, Testee):
    def run(self, fn):
        fn(Tester._testee)
    for name, member in inspect.getmembers(
        object=Testee, predicate=inspect.isfunction or inspect.iscoroutine):
        if len(inspect.signature(member).parameters) == 1:            
            setattr(Tester,'test_' + name, functools.partialmethod(run, member))

class Testee:
    def __init__(self):
        self._a = 'a'
    def a(self):
        print(self._a)
    def ab(self, a, b):
        print('a')
    def b(self):
        print('b')    
    def h(self):
        print('h')    
    async def q(self):
        print('async q')
    #...

    #...
    def z(self):
        print('z')

class Tester(unittest.TestCase):
    _testee = Testee()
auto_generate_test_cases(Tester, Testee)

py.test。输出：

C:\tests>py.test sandbox.py --verbose
============================= test session starts =============================
platform win32 -- Python 3.5.1, pytest-2.9.2, py-1.4.31, pluggy-0.3.1 -- c:\program files\python35\python.exe
cachedir: .cache
rootdir: C:\tests, inifile:
collected 5 items

sandbox.py::Tester::test_a PASSED
sandbox.py::Tester::test_b PASSED
sandbox.py::Tester::test_h PASSED
sandbox.py::Tester::test_q PASSED
sandbox.py::Tester::test_z PASSED

========================== 5 passed in 0.07 seconds ===========================

如何为无参数方法自动生成测试用例？

how to auto generate test cases for parameter-less methods?

python

pytest