Test that groups and patterns are tested correctly when calling exists() for
autocommands.

STARTTEST
:so small.vim
:let results=[]
:augroup auexists
:augroup END
:call add(results, "##BufEnter: " . exists("##BufEnter"))
:call add(results, "#BufEnter: " . exists("#BufEnter"))
:au BufEnter * let g:entered=1
:call add(results, "#BufEnter: " . exists("#BufEnter"))
:call add(results, "#auexists#BufEnter: " . exists("#auexists#BufEnter"))
:augroup auexists
:au BufEnter * let g:entered=1
:augroup END
:call add(results, "#auexists#BufEnter: " . exists("#auexists#BufEnter"))
:call add(results, "#BufEnter#*.test: " . exists("#BufEnter#*.test"))
:au BufEnter *.test let g:entered=1
:call add(results, "#BufEnter#*.test: " . exists("#BufEnter#*.test"))
:edit testfile.test
:call add(results, "#BufEnter#<buffer>: " . exists("#BufEnter#<buffer>"))
:au BufEnter <buffer> let g:entered=1
:call add(results, "#BufEnter#<buffer>: " . exists("#BufEnter#<buffer>"))
:edit testfile2.test
:call add(results, "#BufEnter#<buffer>: " . exists("#BufEnter#<buffer>"))
:e! test.out
:call append(0, results)
:$d
:w
:qa!
ENDTEST