vim-patch:9.0.0415: on MS-Windows some tests are flaky

Problem:    On MS-Windows some tests are flaky.
Solution:   Add sleeps, disable swapfile, mark test as flaky. (Ken Takata,
            closes vim/vim#11082)

0500e87eba

Co-authored-by: K.Takata <kentkt@csc.jp>

test/old/testdir/test_autocmd.vim

@@ -971,6 +971,7 @@ func Test_autocmd_bufwipe_in_SessLoadPost()
 
   call writefile(content, 'Xvimrc', 'D')
   call system(GetVimCommand('Xvimrc') .. ' --headless --noplugins -S Session.vim -c cq')
+  sleep 50m
   let errors = join(readfile('Xerrors'))
   call assert_match('E814:', errors)
 

test/old/testdir/test_buffer.vim

@@ -379,6 +379,7 @@ endfunc
 func Test_buffer_scheme()
   CheckMSWindows
 
+  set noswapfile
   set noshellslash
   %bwipe!
   let bufnames = [
@@ -401,6 +402,7 @@ func Test_buffer_scheme()
   endfor
 
   set shellslash&
+  set swapfile&
 endfunc
 
 " this was using a NULL pointer after failing to use the pattern

test/old/testdir/test_bufline.vim

@@ -88,6 +88,7 @@ func Test_setline_startup()
   endif
   call writefile(['call setline(1, "Hello")', 'silent w Xtest', 'q!'], 'Xscript', 'D')
   call system(cmd)
+  sleep 50m
   call assert_equal(['Hello'], readfile('Xtest'))
 
   call delete('Xtest')

test/old/testdir/test_profile.vim

@@ -44,6 +44,7 @@ func Test_profile_func()
     \ . ' --cmd "qall!"')
   call assert_equal(0, v:shell_error)
 
+  sleep 50m
   let lines = readfile('Xprofile_func.log')
 
   " - Foo1() is called 3 times but should be reported as called twice

test/old/testdir/test_shell.vim

@@ -5,6 +5,11 @@ source check.vim
 source shared.vim
 
 func Test_shell_options()
+  if has('win32')
+    " FIXME: This test is flaky on MS-Windows.
+    let g:test_is_flaky = 1
+  endif
+
   " The expected value of 'shellcmdflag', 'shellpipe', 'shellquote',
   " 'shellredir', 'shellxescape', 'shellxquote' for the supported shells.
   let shells = []

test/old/testdir/test_undo.vim

@@ -399,6 +399,11 @@ endfunc
 
 func Test_undofile_earlier()
   throw 'Skipped: Nvim does not support test_settime()'
+  if has('win32')
+    " FIXME: This test is flaky on MS-Windows.
+    let g:test_is_flaky = 1
+  endif
+
   " Issue #1254
   " create undofile with timestamps older than Vim startup time.
   let t0 = localtime() - 43200