diff --git a/src/testdir/test_startup_utf8.vim b/src/testdir/test_startup_utf8.vim
index e8b99e7..9377667 100644
--- a/src/testdir/test_startup_utf8.vim
+++ b/src/testdir/test_startup_utf8.vim
@@ -60,6 +60,33 @@
   call delete('Xtestout')
 endfunc
 
+func Test_detect_fifo()
+  CheckUnix
+  " Using bash/zsh's process substitution.
+  if executable('bash')
+    set shell=bash
+  elseif executable('zsh')
+    set shell=zsh
+  else
+    throw 'Skipped: bash or zsh is required'
+  endif
+  let linesin = ['one', 'two']
+  call writefile(linesin, 'Xtestin_fifo', 'D')
+  let after = [
+	\ 'call writefile(split(execute(":mess"), "\\n"), "Xtestout")',
+	\ 'quit!',
+	\ ]
+  if RunVim([], after, '<(cat Xtestin_fifo)')
+    let lines = readfile('Xtestout')
+    call assert_match('\[fifo\]', lines[0])
+    call assert_match('\[fifo\]', lines[1])
+  else
+    call assert_equal('', 'RunVim failed.')
+  endif
+
+  call delete('Xtestout')
+endfunc
+
 func Test_detect_ambiwidth()
   CheckRunVimInTerminal