On debian 9 using lxterminal I had to modify lib/util/test.sh to make unit test work.

[constrict0r]

The test is the sample test on README.md:
#!/bin/bash
source "$( cd "${BASH_SOURCE[0]%/*}" && pwd )/lib/oo-bootstrap.sh"
import util/test UI/Color
it 'should make a number and change its value'
try
integer aNumber=10
aNumber=12
test $aNumber == 12
expectPass

When the test is runned the next error is shown:
UI.Color.Red: order not found
UI.Color.Default: order not found

The problem happens on line 70 of test.sh:
alias caught="echo "CAUGHT: $(UI.Color.Red)$BACKTRACE_COMMAND$(UI.Color.Default) in $BACKTRACE_SOURCE:$BACKTRACE_LINE""

Why it did as a workaround was to put the aliases on the same file just above the conflicting line:
alias UI.Color.Default="echo"
alias UI.Color.Red="echo"
alias describe='Test NewGroup'
alias summary='Test DisplaySummary'
alias caught="echo "CAUGHT: $(UI.Color.Red)$BACKTRACE_COMMAND$(UI.Color.Default) in $BACKTRACE_SOURCE:$BACKTRACE_LINE""

And all work.

The lxterminal I'm using uses 8 colors:.