Support NO_COLOR environment variable

[olafurpg]

Currently, the only way to disable ANSI color output from MUnit is to use the cryptic combination of the testing framework flags testOnly -- -n +l. We should make it easier to disable colors in MUnit by respecting the NO_COLOR environment variable https://no-color.org/

[worace]

This would be great to have. In the process of looking for this I also learned that there is an existing --no-color command line flag accepted by SBT. This seems to work to disable color output for scalatest but not for MUnit.

Would it make sense for MUnit to honor that flag as well, or is it too sbt-specific?

[pokle]

I'd like there to be a way to turn off all terminal escape codes - because they just create a lot of noise in the log output of my build tool (buildkite)

[mzuehlke]

This got fixed by

• Honor the NO_COLOR environment variable. #703