tests: conditionalize output for Python 3
It appears that the random.randint() behavior is different between Python 2
and Python 3. So make the test conditional on that.
This makes the test pass on Python 3.7 (and presumably other Python 3 versions).
Differential Revision: https://phab.mercurial-scm.org/D6964
warning
error
b'buffered\n'
colored? True
colored? True