title: pytest is not parsing command line arguments on windows <instead running all the tests>
body: <p>I have 2.3.3 version of pytest running on windows. I have a test folder which contains bunch of test files like test1.py, test2.py, test3.py etc. If i open command prompt and navigate to this folder to run a particular test </p>
  
  <p>pytest test1.py</p>
  
  <p>Instead of just running test1.py, it is running all the tests in the folder. Like test1.py, test2.py, test3.py etc.
  So pytest is not taking arguments and parsing them. I am seeing this only on windows. Does anyone know what is happening here?</p>
  
  <p>Thanks a bunch in advance.</p>