This page has a test of field colors:

Test simple text values [edit section]

TextColorData
||text||color||
||yes||should be green||
||no||should be red||
||maybe||should be yellow||
||another line||should have no color||

text  ^	color  ^
yes	should be green
no	should be red
maybe	should be yellow
another line	should have no color

Query

Test color expressions on integers [edit section]

IntColorData
||integer||color||
||5||should be light yellow||
||10||should be yellow||
||20||should be yellow||
||50||no color||
||100||no color||
||600||should be red||
||1000||should be red||

integer  ^	color  ^
5	should be light yellow
10	should be yellow
20	should be yellow
50	no color
100	no color
600	should be red
1000	should be red

Query

Test some other expressions [edit section]

This tests use of 'in' and 'startswith' as well as empty lines in the colors list.

FruitData
||fruit||
||apple||
||banana||
||avacado||

fruit  ^

apple

banana

avacado

Query