现象 ： 使用 unittest 写的代码( 其中含有 loader.loadTestsFromModule( ) ) ，用 pytest 执行测试，搜集不到测试用例 。
疑问：难道用 pytest 执行 unittest 测试用例，动态导模块时，一定需要把类也导入 ？
1、项目结构层级如下：
2、各目录代码如下：
test_aa.py 代码：
class TestAA: def __init__(self, a, b): self.a = int(a) self.b = int(b) def add(self): return self.a + self.b
test_bb.py 代码如下：
from unittest import TestCase from aa.test_aa import TestAA class TestBB(TestCase): def setUp(self): print("开始测试") def test_add(self): add = TestAA(3,5) actually_result = add.add() except_result = 8 self.assertEqual(actually_result,except_result) def test_add_02(self): add = TestAA(2,5) actually_result = add.add() except_result = 7 self.assertEqual(actually_result,except_result) def tearDown(self): print("测试结束")
test_cc.py 代码如下：
from bb.test_bb import TestBB
import importlib
from unittest import TestLoader, TestSuite
test_modlue = importlib.import_module('.test_bb', package='bb') #相对导入
suite = TestSuite()
loader = TestLoader()
suite.addTest(loader.loadTestsFromModule(test_modlue))
# suite.addTest(loader.loadTestsFromTestCase(TestBB))
用pytest 的方式执行
执行结果如下，搜集不到测试用例：
D:\SkyWorkSpace\WorkSpace\Pytest\Temp\day14\venv\Scripts\python.exe "C:\SkyWorkSpace\WorkTools\PyCharm\PyCharm_Community_Edition_202003\PyCharm Community Edition 2020.3\plugins\python-ce\helpers\pycharm\_jb_pytest_runner.py" --path D:/SkyWorkSpace/WorkSpace/Pytest/Temp/day14/cc/test_cc.py
Testing started at 0:11 ...
Launching pytest with arguments D:/SkyWorkSpace/WorkSpace/Pytest/Temp/day14/cc/test_cc.py in D:\SkyWorkSpace\WorkSpace\Pytest\Temp\day14\cc
============================= test session starts =============================
platform win32 -- Python 3.8.6, pytest-6.2.4, py-1.10.0, pluggy-0.13.1 -- D:\SkyWorkSpace\WorkSpace\Pytest\Temp\day14\venv\Scripts\python.exe
cachedir: .pytest_cache
rootdir: D:\SkyWorkSpace\WorkSpace\Pytest\Temp\day14\cc
collecting ... collected 0 items
============================== warnings summary ===============================
C:\SkyWorkSpace\WorkTools\python\Python38\lib\unittest\loader.py:66
C:\SkyWorkSpace\WorkTools\python\Python38\lib\unittest\loader.py:66: PytestCollectionWarning: cannot collect test class 'TestLoader' because it has a __init__ constructor (from: test_cc.py)
class TestLoader(object):
C:\SkyWorkSpace\WorkTools\python\Python38\lib\unittest\suite.py:92
C:\SkyWorkSpace\WorkTools\python\Python38\lib\unittest\suite.py:92: PytestCollectionWarning: cannot collect test class 'TestSuite' because it has a __init__ constructor (from: test_cc.py)
class TestSuite(BaseTestSuite):
-- Docs: https://docs.pytest.org/en/stable/warnings.html
============================= 2 warnings in 0.01s =============================
Process finished with exit code 5
Empty suite
1）如果我在 test_cc.py文件中加入导入类 from bb.test_bb import TestBB ，则执行成功。 为什么会是这样呢？
代码如下：
from bb.test_bb import TestBB import importlib from unittest import TestLoader, TestSuite test_modlue = importlib.import_module('.test_bb', package='bb') #相对导入 suite = TestSuite() loader = TestLoader() suite.addTest(loader.loadTestsFromModule(test_modlue)) # suite.addTest(loader.loadTestsFromTestCase(TestMy))
执行结果如下：
D:\SkyWorkSpace\WorkSpace\Pytest\Temp\day14\venv\Scripts\python.exe "C:\SkyWorkSpace\WorkTools\PyCharm\PyCharm_Community_Edition_202003\PyCharm Community Edition 2020.3\plugins\python-ce\helpers\pycharm\_jb_pytest_runner.py" --path D:/SkyWorkSpace/WorkSpace/Pytest/Temp/day14/cc/test_cc.py Testing started at 23:36 ... Launching pytest with arguments D:/SkyWorkSpace/WorkSpace/Pytest/Temp/day14/cc/test_cc.py in D:\SkyWorkSpace\WorkSpace\Pytest\Temp\day14\cc ============================= test session starts ============================= platform win32 -- Python 3.8.6, pytest-6.2.4, py-1.10.0, pluggy-0.13.1 -- D:\SkyWorkSpace\WorkSpace\Pytest\Temp\day14\venv\Scripts\python.exe cachedir: .pytest_cache rootdir: D:\SkyWorkSpace\WorkSpace\Pytest\Temp\day14\cc collecting ... collected 2 items test_cc.py::TestBB::test_add <- ..\bb\test_bb.py PASSED [ 50%]开始测试 测试结束 test_cc.py::TestBB::test_add_02 <- ..\bb\test_bb.py PASSED [100%]开始测试 测试结束 ============================== warnings summary =============================== C:\SkyWorkSpace\WorkTools\python\Python38\lib\unittest\loader.py:66 C:\SkyWorkSpace\WorkTools\python\Python38\lib\unittest\loader.py:66: PytestCollectionWarning: cannot collect test class 'TestLoader' because it has a __init__ constructor (from: test_cc.py) class TestLoader(object): C:\SkyWorkSpace\WorkTools\python\Python38\lib\unittest\suite.py:92 C:\SkyWorkSpace\WorkTools\python\Python38\lib\unittest\suite.py:92: PytestCollectionWarning: cannot collect test class 'TestSuite' because it has a __init__ constructor (from: test_cc.py) class TestSuite(BaseTestSuite): -- Docs: https://docs.pytest.org/en/stable/warnings.html ======================== 2 passed, 2 warnings in 0.02s ======================== Process finished with exit code 0
2）如果我用 suite.addTest(loader.loadTestsFromTestCase(TestMath)) 替换 suite.addTest(loader.loadTestsFromModule(test_modlue)) 是 正常的 。
动态导模块参考： https://blog.csdn.net/edward_zcl/article/details/88809212
二：单独做了个实验 ( 在不导入类的情况下 ，动态导入模块)，如下，是成功的 ：
疑问：难道用 pytest 执行 测试用例，动态导包时，一定需要把类也导入 ？