The following excerpt is taken from the tutorial, and demonstrates how to set the outcome of a test case (if the condition is not met) to failed.
...
if function numval(distance-km) not equal 4787
string "Incorrect distance in kilometers returned - "
distance-km delimited by size
x"0" delimited by size
into errormessage
end-string
call MFU-ASSERT-FAIL-Z using errormessage
end-if
...
This code will also display the errormessage text in the output pane if distance-km is not equal to 4,787: