Incorrect coverage report with WebTest

[qlands]

As described in StackOverflow I have simple WebApp that I am testing with WebTest but the coverage result report missed lines that are executed. This might be related to #117
My test file is very simple:

class FunctionalTests(unittest.TestCase):
    def setUp(self):
        from test_app import main        
        app = main({})
        from webtest import TestApp

        self.testapp = TestApp(app)


    def test_not_found(self):
        self.testapp.get("/not_found", status=404)

The view code is:

@notfound_view_config(renderer="../templates/404.jinja2")
    def notfound_view(request):
        request.response.status = 404 # This is line 6
        return {}  # This is line 7

The coverage result is:

     Name                                                    Stmts   Miss Branch BrPart  Cover   Missing
      test_app/views/notfound.py                                 4      2      0      0    50%   6-7

But those lines are executed
Im using python3 with:

This is pytest version 5.4.1, imported from /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest/__init__.py
setuptools registered plugins:
  celery-4.4.2 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/celery/contrib/pytest.py
  pytest-pyramid-server-1.7.0 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_pyramid_server.py
  pytest-shutil-1.7.0 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_shutil/workspace.py
  pytest-cov-2.8.1 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_cov/plugin.py
  pytest-webdriver-1.7.0 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_webdriver.py
  pytest-server-fixtures-1.7.0 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_server_fixtures/httpd.py
  pytest-server-fixtures-1.7.0 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_server_fixtures/jenkins.py
  pytest-server-fixtures-1.7.0 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_server_fixtures/mongo.py
  pytest-server-fixtures-1.7.0 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_server_fixtures/postgres.py
  pytest-server-fixtures-1.7.0 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_server_fixtures/redis.py
  pytest-server-fixtures-1.7.0 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_server_fixtures/rethink.py
  pytest-server-fixtures-1.7.0 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_server_fixtures/s3.py
  pytest-server-fixtures-1.7.0 at /home/cquiros/data/projects2017/personal/software/env_formshare/lib/python3.6/site-packages/pytest_server_fixtures/xvfb.py

[ionelmc]

Perhaps you're installing the code in site-packages and the report runs on whatever you have in CWD? Post your project layout and coveragerc.