different way

src/testdir/runtest.vim

@@ -411,7 +411,21 @@ func RunTheTest(test)
   endif
 endfunc
 
+function Delete_Xtest_Files()
+  for file in glob('Xtest*', v:false, v:true)
+    call add(v:errors, file .. " exists when it shouldn't, trying to delete it!")
+    call delete(file)
+    if !empty(glob(file, v:false, v:true))
+      call add(v:errors, file .. " still exists after trying to delete it!")
+      if has('unix')
+        call system('rm -rf  ' .. file)
+      endif
+    endif
+  endfor
+endfunc
+
 func AfterTheTest(func_name)
+  call Delete_Xtest_Files()
   if len(v:errors) > 0
     if match(s:may_fail_list, '^' .. a:func_name) >= 0
       let s:fail_expected += 1

src/testdir/test_quickfix.vim

@@ -8,6 +8,19 @@ source screendump.vim
 
 set encoding=utf-8
 
+function Kill_Xtest_stable_xxd()
+  if !empty(glob('Xtest_stable_xxd.txt', v:false, v:true))
+    call add(v:errors, "Xtest_stable_xxd.txt exists when it shouldn't, trying to delete it!")
+    call delete('Xtest_stable_xxd.txt')
+    if !empty(glob('Xtest_stable_xxd.txt', v:false, v:true))
+      call add(v:errors, "Xtest_stable_xxd.txt still exists after trying to delete it!")
+      if has('unix')
+        call system('rm -rf  Xtest_stable_xxd.txt')
+      endif
+    endif
+  endif
+endfunc
+
 func s:setup_commands(cchar)
   if a:cchar == 'c'
     command! -nargs=* -bang Xlist <mods>clist<bang> <args>
@@ -4255,6 +4268,7 @@ endfunc
 
 " The following test used to crash Vim
 func Test_lvimgrep_crash()
+  call Kill_Xtest_stable_xxd()
   sv Xtest
   augroup QF_Test
     au!