diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index ea95cbf..c0d01fb 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -691,7 +691,7 @@
     bw Xtest\
   endif
 
-  call assert_fails("call getcompletion('\\\\@!\\\\@=', 'buffer')", 'E871:')
+  call assert_fails("call getcompletion('\\\\@!\\\\@=', 'buffer')", 'E866:')
   call assert_fails('call getcompletion("", "burp")', 'E475:')
   call assert_fails('call getcompletion("abc", [])', 'E1174:')
 endfunc
@@ -3755,4 +3755,21 @@
   call assert_equal(expected, winheight(0))
 endfunc
 
+" verify that buffer-completion finds all buffer names matching a pattern
+func Test_buffer_completion()
+  " should return empty list
+  call assert_equal([], getcompletion('', 'buffer'))
+
+  call mkdir('Xbuf_complete', 'R')
+  e Xbuf_complete/Foobar.c
+  e Xbuf_complete/MyFoobar.c
+  e AFoobar.h
+  let expected = ["Xbuf_complete/Foobar.c", "Xbuf_complete/MyFoobar.c", "AFoobar.h"]
+
+  call assert_equal(3, len(getcompletion('Foo', 'buffer')))
+  call assert_equal(expected, getcompletion('Foo', 'buffer'))
+  call feedkeys(":b Foo\<C-A>\<C-B>\"\<CR>", 'xt')
+  call assert_equal("\"b Xbuf_complete/Foobar.c Xbuf_complete/MyFoobar.c AFoobar.h", @:)
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab