我有一个Python库，其中正在设置一些测试。作为测试的一部分，我使用MagicMock模拟了某些功能，例如JSON加载以及打开和关闭文件。测试正常，一切正常。
当我尝试覆盖测试时，问题就来了。自从我介绍了使用模拟的新测试以来，我的报道就崩溃了。
这是我实现模拟的部分：
def setUp(self):
# Setup the content of the config files for the tests
json.load = MagicMock(side_effect=file_content)
# Opening a file returns the name of the file
def get_mock_context(filename):
mock_context = MagicMock()
mock_context.__enter__.return_value = filename
mock_context.__exit__.return_value = False
return mock_context
builtins.open = MagicMock(side_effect=get_mock_context)
如前所述，当我运行测试时，一切似乎都正常运行
python -m unittest discover -s tests -p "*Tests.py"
...........................
----------------------------------------------------------------------
Ran 27 tests in 1.322s
OK
尽管如此，我一介绍一下覆盖范围：
coverage run -m unittest discover -s tests -p "*Tests.py"
...........................
----------------------------------------------------------------------
Ran 27 tests in 1.759s
OK
Traceback (most recent call last):
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/cmdline.py", line 627, in do_run
self.run_python_module(args[0], args)
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/execfile.py", line 122, in run_python_module
run_python_file(pathname, args, package=packagename, modulename=modulename, path0=path0)
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/execfile.py", line 192, in run_python_file
exec(code, main_mod.__dict__)
File "/anaconda3/envs/c360/lib/python3.7/unittest/__main__.py", line 18, in <module>
main(module=None)
File "/anaconda3/envs/c360/lib/python3.7/unittest/main.py", line 101, in __init__
self.runTests()
File "/anaconda3/envs/c360/lib/python3.7/unittest/main.py", line 273, in runTests
sys.exit(not self.result.wasSuccessful())
SystemExit: False
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/anaconda3/envs/c360/bin/coverage", line 10, in <module>
sys.exit(main())
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/cmdline.py", line 756, in main
status = CoverageScript().command_line(argv)
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/cmdline.py", line 491, in command_line
return self.do_run(options, args)
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/cmdline.py", line 641, in do_run
self.coverage.save()
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/control.py", line 782, in save
self.data_files.write(self.data, suffix=self.data_suffix)
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/data.py", line 680, in write
data.write_file(filename)
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/data.py", line 467, in write_file
with open(filename, 'w') as fdata:
File "/anaconda3/envs/c360/lib/python3.7/unittest/mock.py", line 951, in __call__
return _mock_self._mock_call(*args, **kwargs)
File "/anaconda3/envs/c360/lib/python3.7/unittest/mock.py", line 1017, in _mock_call
result = effect(*args, **kwargs)
TypeError: get_mock_context() takes 1 positional argument but 2 were given
我不知道可能是什么问题。我尝试排除测试文件中包含pragma: no cover进行模拟的行，但没有执行任何操作。我找不到重新进行这项工作的方法。有什么想法或您认为我可能会错过的东西吗？
编辑：
我只是清理了一下以前粘贴的代码。如果我运行coverage指定我只想将本地目录中的文件用作源（以避免在python库等中使用Coverage），则会收到以下错误。仍然无法正常工作，但与众不同：
Traceback (most recent call last):
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/cmdline.py", line 627, in do_run
self.run_python_module(args[0], args)
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/execfile.py", line 122, in run_python_module
run_python_file(pathname, args, package=packagename, modulename=modulename, path0=path0)
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/execfile.py", line 192, in run_python_file
exec(code, main_mod.__dict__)
File "/anaconda3/envs/c360/lib/python3.7/unittest/__main__.py", line 18, in <module>
main(module=None)
File "/anaconda3/envs/c360/lib/python3.7/unittest/main.py", line 101, in __init__
self.runTests()
File "/anaconda3/envs/c360/lib/python3.7/unittest/main.py", line 273, in runTests
sys.exit(not self.result.wasSuccessful())
SystemExit: False
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/anaconda3/envs/c360/bin/coverage", line 10, in <module>
sys.exit(main())
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/cmdline.py", line 756, in main
status = CoverageScript().command_line(argv)
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/cmdline.py", line 491, in command_line
return self.do_run(options, args)
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/cmdline.py", line 641, in do_run
self.coverage.save()
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/control.py", line 781, in save
self.get_data()
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/control.py", line 834, in get_data
self._post_save_work()
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/control.py", line 864, in _post_save_work
self._find_unexecuted_files(src)
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/control.py", line 913, in _find_unexecuted_files
for file_path, plugin_name in itertools.chain(py_files, plugin_files):
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/control.py", line 910, in <genexpr>
py_files = ((py_file, None) for py_file in find_python_files(src_dir))
File "/anaconda3/envs/c360/lib/python3.7/site-packages/coverage/files.py", line 416, in find_python_files
del dirnames[:]
TypeError: 'tuple' object does not support item deletion