estyrke

Tests for file handle inheritance issues

1. test_write.py uses subprocess.call without redirection

• This fails on Python 2.x because the close_fds argument to call() defaults to False and file handles are inheritable by default
• This succeeds on Python 3.x because the close_fds argument to call() defaults to True when redirection is not used

2. test_write_redirect.py uses subprocess.call with stdout redirection

• This fails on Python 2.x because the close_fds argument to call() defaults to False and file handles are inheritable by default
• This fails on Python 3.x (x < 4) because the close_fds argument to call() defaults to False when redirection is used and file handles are inheritable by default
• This succeeds on Python 3.4 because file handles are non-inheritable by default