Tests for signs
STARTTEST
:so small.vim
:if !has("signs")
:  e! test.ok
:  wq! test.out
:endif
:"
:sign define JumpSign text=x
:exe 'sign place 42 line=2 name=JumpSign buffer=' . bufnr('')
:" Split the window to the bottom to verify :sign-jump will stay in the current
:" window if the buffer is displayed there
:bot split
:exe 'sign jump 42 buffer=' . bufnr('')
:call append(line('$'), winnr())
:$-1,$w! test.out
ENDTEST

STARTTEST
:qa!
ENDTEST