diff --git a/src/testdir/test_channel.vim b/src/testdir/test_channel.vim
index 6b595d0..930868f 100644
--- a/src/testdir/test_channel.vim
+++ b/src/testdir/test_channel.vim
@@ -714,7 +714,7 @@
 endfunc
 
 func Test_nl_read_file()
-  call writefile(['echo something', 'echoerr wrong', 'double this'], 'Xinput')
+  call writefile(['echo something', 'echoerr wrong', 'double this'], 'Xinput', 'D')
   let g:job = job_start(s:python . " test_channel_pipe.py",
 	\ {'in_io': 'file', 'in_name': 'Xinput'})
   call assert_equal("run", job_status(g:job))
@@ -726,7 +726,6 @@
     call assert_equal("AND this", ch_readraw(handle))
   finally
     call Stop_g_job()
-    call delete('Xinput')
   endtry
   call assert_fails("echo ch_read(test_null_channel(), {'callback' : 'abc'})", 'E475:')
 endfunc
@@ -1161,14 +1160,13 @@
       endif
       call job_start(cmd, #{out_io: 'buffer', out_name: 'Xscrollbuffer'})
   END
-  call writefile(lines, 'XtestBufferScroll')
+  call writefile(lines, 'XtestBufferScroll', 'D')
   let buf = RunVimInTerminal('-S XtestBufferScroll', #{rows: 10})
   call TermWait(buf, 50)
   call VerifyScreenDump(buf, 'Test_job_buffer_scroll_1', {})
 
   " clean up
   call StopVimInTerminal(buf)
-  call delete('XtestBufferScroll')
 endfunc
 
 func Test_pipe_null()
@@ -2178,7 +2176,7 @@
 func Test_job_tty_in_out()
   CheckUnix
 
-  call writefile(['test'], 'Xtestin')
+  call writefile(['test'], 'Xtestin', 'D')
   let in_opts = [{},
         \ {'in_io': 'null'},
         \ {'in_io': 'file', 'in_name': 'Xtestin'}]
@@ -2220,7 +2218,6 @@
     call WaitForAssert({-> assert_equal('dead', job_status(job))})
   endfor
 
-  call delete('Xtestin')
   call delete('Xtestout')
   call delete('Xtesterr')
 endfunc
@@ -2281,9 +2278,9 @@
   let text = readfile('Xlog')
   call assert_match("hello there", text[1])
   call assert_match("%s%s", text[2])
-  call mkdir("Xchlogdir1")
+  call mkdir("Xchlogdir1", 'D')
   call assert_fails("call ch_logfile('Xchlogdir1')", 'E484:')
-  cal delete("Xchlogdir1", 'd')
+
   call delete('Xlog')
 endfunc