diff --git a/test/old/testdir/test_filetype.vim b/test/old/testdir/test_filetype.vim
index 20c33d4dc4..150cf50c2a 100644
--- a/test/old/testdir/test_filetype.vim
+++ b/test/old/testdir/test_filetype.vim
@@ -14,15 +14,14 @@ endfunc
 
 func Test_conf_type()
   filetype on
-  call writefile(['# some comment', 'must be conf'], 'Xfile')
+  call writefile(['# some comment', 'must be conf'], 'Xconffile', 'D')
   augroup filetypedetect
     au BufNewFile,BufRead *	call assert_equal(0, did_filetype())
   augroup END
-  split Xfile
+  split Xconffile
   call assert_equal('conf', &filetype)
 
   bwipe!
-  call delete('Xfile')
   filetype off
 endfunc
 
@@ -30,15 +29,14 @@ func Test_other_type()
   filetype on
   augroup filetypedetect
     au BufNewFile,BufRead *	call assert_equal(0, did_filetype())
-    au BufNewFile,BufRead Xfile	setf testfile
+    au BufNewFile,BufRead Xotherfile	setf testfile
     au BufNewFile,BufRead *	call assert_equal(1, did_filetype())
   augroup END
-  call writefile(['# some comment', 'must be conf'], 'Xfile')
-  split Xfile
+  call writefile(['# some comment', 'must be conf'], 'Xotherfile', 'D')
+  split Xotherfile
   call assert_equal('testfile', &filetype)
 
   bwipe!
-  call delete('Xfile')
   filetype off
 endfunc
 
@@ -358,6 +356,7 @@ let s:filename_checks = {
     \ 'mailcap': ['.mailcap', 'mailcap'],
     \ 'make': ['file.mk', 'file.mak', 'file.dsp', 'makefile', 'Makefile', 'makefile-file', 'Makefile-file', 'some-makefile', 'some-Makefile'],
     \ 'mallard': ['file.page'],
+    "\ 'man': ['file.man'],
     \ 'manconf': ['/etc/man.conf', 'man.config', 'any/etc/man.conf'],
     \ 'map': ['file.map'],
     \ 'maple': ['file.mv', 'file.mpl', 'file.mws'],
@@ -815,13 +814,12 @@ func Run_script_detection(test_dict)
   filetype on
   for [ft, files] in items(a:test_dict)
     for file in files
-      call writefile(file, 'Xtest')
+      call writefile(file, 'Xtest', 'D')
       split Xtest
       call assert_equal(ft, &filetype, 'for text: ' . string(file))
       bwipe!
     endfor
   endfor
-  call delete('Xtest')
   filetype off
 endfunc
 
@@ -867,7 +865,7 @@ endfunc
 func Test_bas_file()
   filetype on
 
-  call writefile(['looks like BASIC'], 'Xfile.bas')
+  call writefile(['looks like BASIC'], 'Xfile.bas', 'D')
   split Xfile.bas
   call assert_equal('basic', &filetype)
   bwipe!
@@ -921,7 +919,6 @@ func Test_bas_file()
   call assert_equal('vb', &filetype)
   bwipe!
 
-  call delete('Xfile.bas')
   filetype off
 endfunc
 
@@ -930,7 +927,7 @@ func Test_cfg_file()
   filetype on
 
   " *.cfg defaults to cfg
-  call writefile(['looks like cfg'], 'cfgfile.cfg')
+  call writefile(['looks like cfg'], 'cfgfile.cfg', 'D')
   split cfgfile.cfg
   call assert_equal('cfg', &filetype)
 
@@ -959,7 +956,7 @@ endfunc
 func Test_d_file()
   filetype on
 
-  call writefile(['looks like D'], 'Xfile.d')
+  call writefile(['looks like D'], 'Xfile.d', 'D')
   split Xfile.d
   call assert_equal('d', &filetype)
   bwipe!
@@ -991,7 +988,6 @@ func Test_d_file()
 
   " clean up
   filetype off
-  call delete('Xfile.d')
 endfunc
 
 func Test_dat_file()
@@ -1032,7 +1028,7 @@ endfunc
 func Test_dep3patch_file()
   filetype on
 
-  call assert_true(mkdir('debian/patches', 'p'))
+  call assert_true(mkdir('debian/patches', 'pR'))
 
   " series files are not patches
   call writefile(['Description: some awesome patch'], 'debian/patches/series')
@@ -1065,14 +1061,12 @@ func Test_dep3patch_file()
   split debian/patches/baz
   call assert_notequal('dep3patch', &filetype)
   bwipe!
-
-  call delete('debian', 'rf')
 endfunc
 
 func Test_dsl_file()
   filetype on
 
-  call writefile(['  <!doctype dsssl-spec ['], 'dslfile.dsl')
+  call writefile(['  <!doctype dsssl-spec ['], 'dslfile.dsl', 'D')
   split dslfile.dsl
   call assert_equal('dsl', &filetype)
   bwipe!
@@ -1082,14 +1076,13 @@ func Test_dsl_file()
   call assert_equal('structurizr', &filetype)
   bwipe!
 
-  call delete('dslfile.dsl')
   filetype off
 endfunc
 
 func Test_ex_file()
   filetype on
 
-  call writefile(['arbitrary content'], 'Xfile.ex')
+  call writefile(['arbitrary content'], 'Xfile.ex', 'D')
   split Xfile.ex
   call assert_equal('elixir', &filetype)
   bwipe!
@@ -1119,31 +1112,30 @@ func Test_ex_file()
   call assert_equal('euphoria3', &filetype)
   bwipe!
 
-  call delete('Xfile.ex')
   filetype off
 endfunc
 
 func Test_foam_file()
   filetype on
-  call assert_true(mkdir('0', 'p'))
-  call assert_true(mkdir('0.orig', 'p'))
+  call assert_true(mkdir('0', 'pR'))
+  call assert_true(mkdir('0.orig', 'pR'))
 
-  call writefile(['FoamFile {', '    object something;'], 'Xfile1Dict')
+  call writefile(['FoamFile {', '    object something;'], 'Xfile1Dict', 'D')
   split Xfile1Dict
   call assert_equal('foam', &filetype)
   bwipe!
 
-  call writefile(['FoamFile {', '    object something;'], 'Xfile1Dict.something')
+  call writefile(['FoamFile {', '    object something;'], 'Xfile1Dict.something', 'D')
   split Xfile1Dict.something
   call assert_equal('foam', &filetype)
   bwipe!
 
-  call writefile(['FoamFile {', '    object something;'], 'XfileProperties')
+  call writefile(['FoamFile {', '    object something;'], 'XfileProperties', 'D')
   split XfileProperties
   call assert_equal('foam', &filetype)
   bwipe!
 
-  call writefile(['FoamFile {', '    object something;'], 'XfileProperties.something')
+  call writefile(['FoamFile {', '    object something;'], 'XfileProperties.something', 'D')
   split XfileProperties.something
   call assert_equal('foam', &filetype)
   bwipe!
@@ -1168,19 +1160,13 @@ func Test_foam_file()
   call assert_equal('foam', &filetype)
   bwipe!
 
-  call delete('0', 'rf')
-  call delete('0.orig', 'rf')
-  call delete('Xfile1Dict')
-  call delete('Xfile1Dict.something')
-  call delete('XfileProperties')
-  call delete('XfileProperties.something')
   filetype off
 endfunc
 
 func Test_frm_file()
   filetype on
 
-  call writefile(['looks like FORM'], 'Xfile.frm')
+  call writefile(['looks like FORM'], 'Xfile.frm', 'D')
   split Xfile.frm
   call assert_equal('form', &filetype)
   bwipe!
@@ -1200,14 +1186,13 @@ func Test_frm_file()
   call assert_equal('vb', &filetype)
   bwipe!
 
-  call delete('Xfile.frm')
   filetype off
 endfunc
 
 func Test_fs_file()
   filetype on
 
-  call writefile(['looks like F#'], 'Xfile.fs')
+  call writefile(['looks like F#'], 'Xfile.fs', 'D')
   split Xfile.fs
   call assert_equal('fsharp', &filetype)
   bwipe!
@@ -1237,14 +1222,13 @@ func Test_fs_file()
   call assert_equal('forth', &filetype)
   bwipe!
 
-  call delete('Xfile.fs')
   filetype off
 endfunc
 
 func Test_git_file()
   filetype on
 
-  call assert_true(mkdir('Xrepo.git', 'p'))
+  call assert_true(mkdir('Xrepo.git', 'pR'))
 
   call writefile([], 'Xrepo.git/HEAD')
   split Xrepo.git/HEAD
@@ -1266,14 +1250,13 @@ func Test_git_file()
   call assert_equal('git', &filetype)
   bwipe!
 
-  call delete('Xrepo.git', 'rf')
   filetype off
 endfunc
 
 func Test_hook_file()
   filetype on
 
-  call writefile(['[Trigger]', 'this is pacman config'], 'Xfile.hook')
+  call writefile(['[Trigger]', 'this is pacman config'], 'Xfile.hook', 'D')
   split Xfile.hook
   call assert_equal('conf', &filetype)
   bwipe!
@@ -1283,7 +1266,6 @@ func Test_hook_file()
   call assert_notequal('conf', &filetype)
   bwipe!
 
-  call delete('Xfile.hook')
   filetype off
 endfunc
 
@@ -1383,7 +1365,6 @@ func Test_m_file()
   call assert_equal('murphi', &filetype)
   bwipe!
 
-  call delete('Xfile.m')
   filetype off
 endfunc
 
@@ -1465,7 +1446,7 @@ endfunc
 func Test_patch_file()
   filetype on
 
-  call writefile([], 'Xfile.patch')
+  call writefile([], 'Xfile.patch', 'D')
   split Xfile.patch
   call assert_equal('diff', &filetype)
   bwipe!
@@ -1480,7 +1461,6 @@ func Test_patch_file()
   call assert_equal('gitsendemail', &filetype)
   bwipe!
 
-  call delete('Xfile.patch')
   filetype off
 endfunc
 
@@ -1492,19 +1472,18 @@ func Test_perl_file()
 
     use a
   END
-  call writefile(lines, "Xfile.t")
+  call writefile(lines, "Xfile.t", 'D')
   split Xfile.t
   call assert_equal('perl', &filetype)
   bwipe
 
-  call delete('Xfile.t')
   filetype off
 endfunc
 
 func Test_pp_file()
   filetype on
 
-  call writefile(['looks like puppet'], 'Xfile.pp')
+  call writefile(['looks like puppet'], 'Xfile.pp', 'D')
   split Xfile.pp
   call assert_equal('puppet', &filetype)
   bwipe!
@@ -1526,7 +1505,6 @@ func Test_pp_file()
   call assert_equal('pascal', &filetype)
   bwipe!
 
-  call delete('Xfile.pp')
   filetype off
 endfunc
 
@@ -1606,12 +1584,11 @@ endfunc
 func Test_scd_file()
   filetype on
 
-  call writefile(['ijq(1)'], 'srcfile.scd')
+  call writefile(['ijq(1)'], 'srcfile.scd', 'D')
   split srcfile.scd
   call assert_equal('scdoc', &filetype)
-  bwipe!
-  call delete('srcfile.scd')
 
+  bwipe!
   filetype off
 endfunc
 
@@ -1743,7 +1720,7 @@ endfunc
 func Test_tf_file()
   filetype on
 
-  call writefile([';;; TF MUD client is super duper cool'], 'Xfile.tf')
+  call writefile([';;; TF MUD client is super duper cool'], 'Xfile.tf', 'D')
   split Xfile.tf
   call assert_equal('tf', &filetype)
   bwipe!
@@ -1753,14 +1730,13 @@ func Test_tf_file()
   call assert_equal('terraform', &filetype)
   bwipe!
 
-  call delete('Xfile.tf')
   filetype off
 endfunc
 
 func Test_ts_file()
   filetype on
 
-  call writefile(['<?xml version="1.0" encoding="utf-8"?>'], 'Xfile.ts')
+  call writefile(['<?xml version="1.0" encoding="utf-8"?>'], 'Xfile.ts', 'D')
   split Xfile.ts
   call assert_equal('xml', &filetype)
   bwipe!
@@ -1770,14 +1746,13 @@ func Test_ts_file()
   call assert_equal('typescript', &filetype)
   bwipe!
 
-  call delete('Xfile.ts')
   filetype off
 endfunc
 
 func Test_ttl_file()
   filetype on
 
-  call writefile(['@base <http://example.org/> .'], 'Xfile.ttl')
+  call writefile(['@base <http://example.org/> .'], 'Xfile.ttl', 'D')
   split Xfile.ttl
   call assert_equal('turtle', &filetype)
   bwipe!
@@ -1787,26 +1762,24 @@ func Test_ttl_file()
   call assert_equal('teraterm', &filetype)
   bwipe!
 
-  call delete('Xfile.ttl')
   filetype off
 endfunc
 
 func Test_xpm_file()
   filetype on
 
-  call writefile(['this is XPM2'], 'file.xpm')
+  call writefile(['this is XPM2'], 'file.xpm', 'D')
   split file.xpm
   call assert_equal('xpm2', &filetype)
   bwipe!
 
-  call delete('file.xpm')
   filetype off
 endfunc
 
 func Test_cls_file()
   filetype on
 
-  call writefile(['looks like Smalltalk'], 'Xfile.cls')
+  call writefile(['looks like Smalltalk'], 'Xfile.cls', 'D')
   split Xfile.cls
   call assert_equal('st', &filetype)
   bwipe!
@@ -1845,14 +1818,13 @@ func Test_cls_file()
   call assert_equal('vb', &filetype)
   bwipe!
 
-  call delete('Xfile.cls')
   filetype off
 endfunc
 
 func Test_sig_file()
   filetype on
 
-  call writefile(['this is neither Lambda Prolog nor SML'], 'Xfile.sig')
+  call writefile(['this is neither Lambda Prolog nor SML'], 'Xfile.sig', 'D')
   split Xfile.sig
   call assert_equal('', &filetype)
   bwipe!
@@ -1899,7 +1871,6 @@ func Test_sig_file()
   call assert_equal('sml', &filetype)
   bwipe!
 
-  call delete('Xfile.sig')
   filetype off
 endfunc
 
@@ -1919,7 +1890,7 @@ func Test_sil_file()
   let protoErasedPathA =
           \ABCProtocol.a
   END
-  call writefile(lines, 'Xfile.sil')
+  call writefile(lines, 'Xfile.sil', 'D')
 
   split Xfile.sil
   call assert_equal('sil', &filetype)
@@ -1937,14 +1908,13 @@ func Test_sil_file()
   call assert_equal('sile', &filetype)
   bwipe!
 
-  call delete('Xfile.sil')
   filetype off
 endfunc
 
 func Test_inc_file()
   filetype on
 
-  call writefile(['this is the fallback'], 'Xfile.inc')
+  call writefile(['this is the fallback'], 'Xfile.inc', 'D')
   split Xfile.inc
   call assert_equal('pov', &filetype)
   bwipe!
@@ -2011,19 +1981,18 @@ func Test_inc_file()
   bwipe!
 
   " asm
-  call writefile(['asmsyntax=bar'], 'Xfile.inc')
+  call writefile(['asmsyntax=foo'], 'Xfile.inc')
   split Xfile.inc
-  call assert_equal('bar', &filetype)
+  call assert_equal('foo', &filetype)
   bwipe!
 
-  call delete('Xfile.inc')
   filetype off
 endfunc
 
 func Test_lsl_file()
   filetype on
 
-  call writefile(['looks like Linden Scripting Language'], 'Xfile.lsl')
+  call writefile(['looks like Linden Scripting Language'], 'Xfile.lsl', 'D')
   split Xfile.lsl
   call assert_equal('lsl', &filetype)
   bwipe!
@@ -2048,7 +2017,6 @@ func Test_lsl_file()
   call assert_equal('larch', &filetype)
   bwipe!
 
-  call delete('Xfile.lsl')
   filetype off
 endfunc