diff --git a/src/testdir/test_channel.vim b/src/testdir/test_channel.vim
index bc43b44..c877934 100644
--- a/src/testdir/test_channel.vim
+++ b/src/testdir/test_channel.vim
@@ -339,10 +339,8 @@
 endfunc
 
 func Test_raw_one_time_callback()
-  call ch_logfile('channellog', 'w')
   call ch_log('Test_raw_one_time_callback()')
   call s:run_server('s:raw_one_time_callback')
-  call ch_logfile('')
 endfunc
 
 """""""""
@@ -420,6 +418,9 @@
     call ch_sendraw(handle, "echo something\n")
     call assert_equal("something", ch_readraw(handle))
 
+    call ch_sendraw(handle, "echoerr wrong\n")
+    call assert_equal("wrong", ch_readraw(handle, {'part': 'err'}))
+
     call ch_sendraw(handle, "double this\n")
     call assert_equal("this", ch_readraw(handle))
     call assert_equal("AND this", ch_readraw(handle))
@@ -431,6 +432,25 @@
   endtry
 endfunc
 
+func Test_nl_err_to_out_pipe()
+  if !has('job')
+    return
+  endif
+  call ch_log('Test_nl_err_to_out_pipe()')
+  let job = job_start(s:python . " test_channel_pipe.py", {'err-io': 'out'})
+  call assert_equal("run", job_status(job))
+  try
+    let handle = job_getchannel(job)
+    call ch_sendraw(handle, "echo something\n")
+    call assert_equal("something", ch_readraw(handle))
+
+    call ch_sendraw(handle, "echoerr wrong\n")
+    call assert_equal("wrong", ch_readraw(handle))
+  finally
+    call job_stop(job)
+  endtry
+endfunc
+
 func Test_pipe_to_buffer()
   if !has('job')
     return
diff --git a/src/testdir/test_channel_pipe.py b/src/testdir/test_channel_pipe.py
index 5994d27..2097d3e 100644
--- a/src/testdir/test_channel_pipe.py
+++ b/src/testdir/test_channel_pipe.py
@@ -18,9 +18,12 @@
             print("Goodbye!")
             sys.stdout.flush()
             break
-        if typed.startswith("echo"):
+        if typed.startswith("echo "):
             print(typed[5:-1])
             sys.stdout.flush()
+        if typed.startswith("echoerr"):
+            print(typed[8:-1], file=sys.stderr)
+            sys.stderr.flush()
         if typed.startswith("double"):
             print(typed[7:-1] + "\nAND " + typed[7:-1])
             sys.stdout.flush()