First a simple test to check if the test script works.

STARTTEST
:" If columns or lines are too small, create wrongtermsize.
:" (Some tests will fail. When columns and/or lines are small)
:if &lines < 24 || &columns < 80 | sp another | w! wrongtermsize | qa! | endif
:"
:" Write a single line to test.out to check if testing works at all.
:%d
athis is a test:w! test.out
:qa!
ENDTEST