tests/test-status-inprocess.py.out

run-tests: check if stream is a tty before using color

Previous implementation (e80041832eec) checked only if sys.stderr was a tty
which was less general. Also makes sure that colors is never used if pygments is
not available, irrespective of --color flag value.

% creating repo
% add and commit
C test.py
% change
M test.py