关于python：无法调试Pycharm中的单元测试

Can't debug unittests in Pycharm

在Pycharm中调试单元测试时遇到问题。我可以用我的配置运行它们，但是当我运行调试器时，会得到以下错误输出：

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Error
Traceback (most recent call last):
File"/usr/local/Cellar/python3/3.6.4_2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/unittest/case.py", line 59, in testPartExecutor
yield
File"/usr/local/Cellar/python3/3.6.4_2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/unittest/case.py", line 605, in run
testMethod()
File"/usr/local/Cellar/python3/3.6.4_2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/unittest/loader.py", line 34, in testFailure
raise self._exception
ImportError: Failed to import test module: tests
Traceback (most recent call last):
File"/usr/local/Cellar/python3/3.6.4_2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/unittest/loader.py", line 462, in _find_test_path
package = self._get_module_from_name(name)
File"/usr/local/Cellar/python3/3.6.4_2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/unittest/loader.py", line 369, in _get_module_from_name
__import__(name)
File"/Users/paymahn/solvvy/scheduler/tests/__init__.py", line 2, in
import tests.test_setup_script
File"/Users/paymahn/solvvy/scheduler/tests/test_setup_script.py", line 3, in
import setup
File"/Applications/PyCharm.app/Contents/helpers/pydev/setup.py", line 87, in
data_files.append(('pydevd_attach_to_process', [os.path.join('pydevd_attach_to_process', f) for f in os.listdir('pydevd_attach_to_process') if accept_file(f)]))
FileNotFoundError: [Errno 2] No such file or directory: 'pydevd_attach_to_process'

我的目录结构是：

enter image description here

我的UnitTest配置是：

enter image description here

tests/test_setup_script.py看起来像：

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import unittest
import os
import setup # the path to this file is scheduler/setup.py. This import may be breaking things

class TestSetupScript(unittest.TestCase):

def test_load_db_connection_valid_yaml_file(self):
file_name ="valid-yaml.yml"
with open(file_name, 'w') as file:
file.write("""
test:
hello world
a = b
""")

yaml = setup.load_yaml_configuration(file_name)
# I want to debug the line above, hence no assertions here

pydevd_attach_to_process做什么？如何确保在调试期间找到它？问题是否与正在查找的文件/目录无关？