diff --git a/src/testdir/test76.in b/src/testdir/test76.in
new file mode 100644
index 0000000..db7ebe2
--- /dev/null
+++ b/src/testdir/test76.in
@@ -0,0 +1,46 @@
+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
diff --git a/src/testdir/test76.ok b/src/testdir/test76.ok
new file mode 100644
index 0000000..2a70acb
--- /dev/null
+++ b/src/testdir/test76.ok
@@ -0,0 +1,4 @@
++++
+
+two
+threeDEF