Tests for completefunc/omnifunc. vim: set ft=vim :

STARTTEST
:"Test that nothing happens if the 'completefunc' opens
:"a new window (no completion, no crash)
:so small.vim
:function! DummyCompleteOne(findstart, base)
:  if a:findstart
:    return 0
:  else
:    wincmd n
:    return ['onedef', 'oneDEF']
:  endif
:endfunction
:setlocal completefunc=DummyCompleteOne
/^one
A:q!
:function! DummyCompleteTwo(findstart, base)
:  if a:findstart
:    wincmd n
:    return 0
:  else
:    return ['twodef', 'twoDEF']
:  endif
:endfunction
:setlocal completefunc=DummyCompleteTwo
/^two
A:q!
:"Test that 'completefunc' works when it's OK.
:function! DummyCompleteThree(findstart, base)
:  if a:findstart
:    return 0
:  else
:    return ['threedef', 'threeDEF']
:  endif
:endfunction
:setlocal completefunc=DummyCompleteThree
/^three
A:/^+++/,/^three/w! test.out
:qa!
ENDTEST

+++
one
two
three