[ROS2][Windows] ROS Tests fail to build

When running ROS tests using colcon test --event-handlers console_direct+ on the Windows build (https://github.com/ros-planning/srdfdom/pull/91),
I believe this is related to ROS2 tests not working on Ubuntu (https://github.com/ros-planning/srdfdom/issues/92).
test 1
    Start 1: test_parser

1: Test command: C:\opt\ros\foxy\x64\python.exe "-u" "C:/opt/ros/foxy/x64/share/ament_cmake_test/cmake/run_test.py" "C:/ws/moveit2_ws/build/srdfdom/test_results/srdfdom/test_parser.xunit.xml" "--package-name" "srdfdom" "--output-file" "C:/ws/moveit2_ws/build/srdfdom/ament_cmake_pytest/test_parser.txt" "--command" "C:/opt/ros/foxy/x64/python.exe" "-u" "-m" "pytest" "C:/ws/moveit2_ws/src/srdfdom/test/test.py" "-o" "cache_dir=C:/ws/moveit2_ws/build/srdfdom/ament_cmake_pytest/test_parser/.cache" "--junit-xml=C:/ws/moveit2_ws/build/srdfdom/test_results/srdfdom/test_parser.xunit.xml" "--junit-prefix=srdfdom"
1: Test timeout computed to be: 60
1: -- run_test.py: invoking following command in 'C:\ws\moveit2_ws\build\srdfdom':
1:  - C:/opt/ros/foxy/x64/python.exe -u -m pytest C:/ws/moveit2_ws/src/srdfdom/test/test.py -o cache_dir=C:/ws/moveit2_ws/build/srdfdom/ament_cmake_pytest/test_parser/.cache --junit-xml=C:/ws/moveit2_ws/build/srdfdom/test_results/srdfdom/test_parser.xunit.xml --junit-prefix=srdfdom
1: ============================= test session starts =============================
1: platform win32 -- Python 3.8.3, pytest-6.0.1, py-1.9.0, pluggy-0.13.1
1: cachedir: C:\ws\moveit2_ws\build\srdfdom\ament_cmake_pytest\test_parser\.cache
1: rootdir: C:\ws\moveit2_ws\src\srdfdom
1: plugins: ament-copyright-0.9.5, ament-flake8-0.9.5, ament-lint-0.9.5, ament-mypy-0.9.5, ament-pep257-0.9.5, ament-xmllint-0.9.5, colcon-core-0.6.0, launch-testing-0.10.3, launch-testing-ros-0.10.3, cov-2.10.1, mock-3.3.1, repeat-0.8.0, rerunfailures-9.1
1: collected 0 items / 1 error
1:
1: =================================== ERRORS ====================================
1: ________________________ ERROR collecting test session ________________________
1: C:\opt\ros\foxy\x64\lib\site-packages\pluggy\hooks.py:286: in __call__
1:     return self._hookexec(self, self.get_hookimpls(), kwargs)
1: C:\opt\ros\foxy\x64\lib\site-packages\pluggy\manager.py:93: in _hookexec
1:     return self._inner_hookexec(hook, methods, kwargs)
1: C:\opt\ros\foxy\x64\lib\site-packages\pluggy\manager.py:84: in <lambda>
1:     self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
1: C:\opt\ros\foxy\x64\lib\site-packages\_pytest\python.py:195: in pytest_collect_file
1:     module = ihook.pytest_pycollect_makemodule(
1: C:\opt\ros\foxy\x64\lib\site-packages\pluggy\hooks.py:286: in __call__
1:     return self._hookexec(self, self.get_hookimpls(), kwargs)
1: C:\opt\ros\foxy\x64\lib\site-packages\pluggy\manager.py:93: in _hookexec
1:     return self._inner_hookexec(hook, methods, kwargs)
1: C:\opt\ros\foxy\x64\lib\site-packages\pluggy\manager.py:84: in <lambda>
1:     self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
1: C:\opt\ros\foxy\x64\lib\site-packages\launch_testing\pytest\hooks.py:160: in pytest_pycollect_makemodule
1:     entrypoint = find_launch_test_entrypoint(path)
1: C:\opt\ros\foxy\x64\lib\site-packages\launch_testing\pytest\hooks.py:154: in find_launch_test_entrypoint
1:     return getattr(path.pyimport(), 'generate_test_description', None)
1: C:\opt\ros\foxy\x64\lib\site-packages\py\_path\local.py:704: in pyimport
1:     __import__(modname)
1: C:\opt\ros\foxy\x64\lib\site-packages\_pytest\assertion\rewrite.py:170: in exec_module
1:     exec(co, module.__dict__)
1: ..\..\src\srdfdom\test\test.py:7: in <module>
1:     from srdfdom.srdf import SRDF
1: E   ModuleNotFoundError: No module named 'srdfdom'
1: ============================== warnings summary ===============================
1: C:\opt\ros\foxy\x64\lib\site-packages\_pytest\junitxml.py:446
1:   Warning: The 'junit_family' default value will change to 'xunit2' in pytest 6.0. See:
1:     https://docs.pytest.org/en/stable/deprecations.html#junit-family-default-value-change-to-xunit2
1:   for more information.
1:
1: -- Docs: https://docs.pytest.org/en/stable/warnings.html
1: - generated xml file: C:\ws\moveit2_ws\build\srdfdom\test_results\srdfdom\test_parser.xunit.xml -
1: =========================== short test summary info ===========================
1: ERROR ..\..\src\srdfdom - ModuleNotFoundError: No module named 'srdfdom'
1: !!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!
1: ========================= 1 warning, 1 error in 0.30s =========================
1: -- run_test.py: return code 2
moveit / srdfdom

[ROS2][Windows] ROS Tests fail to build #93
