[PATCH stable] tests: add support in run-tests.py for an environment variable to stop color

[Yuya Nishihara]

On Wed, 26 Jul 2017 17:58:38 -0400, Augie Fackler wrote:
> # HG changeset patch
> # User Augie Fackler <augie at google.com>
> # Date 1501106204 14400
> #      Wed Jul 26 17:56:44 2017 -0400
> # Branch stable
> # Node ID bf9183f48b08e1bde191139b0c83b766fe13cba5
> # Parent  99277f2f93979456860e5a619b819b64e813b81c
> tests: add support in run-tests.py for an environment variable to stop color

Seems reasonable. Queued, thanks.

> --- a/tests/run-tests.py
> +++ b/tests/run-tests.py
> @@ -269,7 +269,7 @@ def getparser():
>      parser.add_option("-c", "--cover", action="store_true",
>          help="print a test coverage report")
>      parser.add_option("--color", choices=["always", "auto", "never"],
> -                      default="auto",
> +                      default=os.environ.get('HGRUNTESTSCOLOR', 'auto'),

Nit: HGRUNTESTSCOLOR=whatever raises exception because possible values are
restricted.