Add test for rendering of UI accents and selection

[vlsi]

Accent and selection can be changed from the command line, so it should be possible to

1. change settings via command line
2. launch demo, capture screenshots

Here's the source: https://www.reddit.com/r/MacOS/comments/9xtg0y/switching_system_appearance_using_terminal/e9wemy8/

I'm not sure how to generate "UI style updated" in realtime, however, executing defaults write -g AppleAccentColor -int 3 before launching the demo works.

#  Appearance
defaults write -globalDomain "AppleInterfaceStyle" -string "Dark"
#  to Disable: delete entry

#  Accent colour
#  this setting defines two properties:
#    - AppleAccentColor
#    - AppleAquaColorVariant
#  it also presets AppleHighlightColor, but this can be overriden
#
#  note that AppleAquaColorVariant is alway "1" except for "Graphite", where it is "6".
#  note that the AccentColor "Blue" is default (when there is no entry) and has no AppleHighlightColor definition.
#
#  Color    AppleAquaColorVariant    AccentColor    AppleHighlightColor
#    Red            1                   0           "1.000000 0.733333 0.721569 Red"
#    Orange         1                   1           "1.000000 0.874510 0.701961 Orange"
#    Yellow         1                   2           "1.000000 0.937255 0.690196 Yellow"
#    Green          1                   3           "0.752941 0.964706 0.678431 Green"
#    Purple         1                   5           "0.968627 0.831373 1.000000 Purple"
#    Pink           1                   6           "1.000000 0.749020 0.823529 Pink"
#    Blue           1                   deleted     deleted
#    Graphite       6                   -1          "0.847059 0.847059 0.862745 Graphite"
defaults write -globalDomain "AppleAquaColorVariant" -int 6
defaults write -globalDomain "AccentColor" -int -1

#  Highlight colour
#  set to Pink
defaults write -globalDomain "AppleHighlightColor" -string "1.000000 0.749020 0.823529 Pink"

[weisJ]

Does defaults write -globalDomain "AppleHighlightColor" -string "1.000000 0.749020 0.823529 Pink" actually work for you. On github actions:

Runtime.getRuntime.exec("defaults write -globalDomain "AppleHighlightColor" -string \"1.000000 0.749020 0.823529 Pink\"");

produces 2020-04-10 20:12:11.994 defaults[1277:10469] Unexpected argument 0.733333; leaving defaults unchanged.

[weisJ]

Ok. Invoking the command specifically using bash -c does work. However the changes are only applied if the settings are reopened. Maybe this script could work:
https://apple.stackexchange.com/questions/332003/toggle-light-mode-dark-mode-and-accent-color-from-one-to-another