ValueError: I/O operation on closed file while running tests

[abhijeetkaurav1st]

When we invoke command make test, it runs all the test successfully.
But produces logging error at the end.

Results (157.68s):
     202 passed
      68 deselected
--- Logging error ---
Traceback (most recent call last):
  File "/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/logging/__init__.py", line 1028, in emit
    stream.write(msg + self.terminator)
  File "/Users/abhijeet.kaurav/calm-dsl/venv/lib/python3.7/site-packages/colorama/ansitowin32.py", line 41, in write
    self.__convertor.write(text)
  File "/Users/abhijeet.kaurav/calm-dsl/venv/lib/python3.7/site-packages/colorama/ansitowin32.py", line 162, in write
    self.write_and_convert(text)
  File "/Users/abhijeet.kaurav/calm-dsl/venv/lib/python3.7/site-packages/colorama/ansitowin32.py", line 187, in write_and_convert
    self.write_plain_text(text, cursor, start)
  File "/Users/abhijeet.kaurav/calm-dsl/venv/lib/python3.7/site-packages/colorama/ansitowin32.py", line 195, in write_plain_text
    self.wrapped.write(text[start:end])
  File "/Users/abhijeet.kaurav/calm-dsl/venv/lib/python3.7/site-packages/_pytest/capture.py", line 427, in write
    self.buffer.write(obj)
ValueError: I/O operation on closed file
Call stack:
  File "/Users/abhijeet.kaurav/calm-dsl/calm/dsl/db/handler.py", line 62, in close
    LOG.debug("Closing connection to local DB")
  File "/Users/abhijeet.kaurav/calm-dsl/calm/dsl/tools/logger.py", line 193, in debug
    return logger.debug(self.__add_caller_info(msg), *args, **kwargs)
Message: ':62] Closing connection to local DB'
Arguments: ()

Findings: This is producible because atexit handler is registered with db.close() method. And inside this method we are logging debug message Closing connection to local DB.

[abhijeetkaurav1st]

Related pytest issues for it: pytest-dev/pytest#5577 and pytest-dev/pytest#5502

[abhijeetkaurav1st]

Added an extra try-catch while closing db connection for handling this error for now.