patch 8.1.2067: no tests for SafeState and SafeStateAgain

Problem:    No tests for SafeState and SafeStateAgain.
Solution:   Add tests.

src/testdir/test_autocmd.vim

@@ -2,6 +2,7 @@
 
 source shared.vim
 source check.vim
+source term_util.vim
 
 func s:cleanup_buffers() abort
   for bnr in range(1, bufnr('$'))
@@ -2225,3 +2226,33 @@ func Test_throw_in_BufWritePre()
   bwipe!
   au! throwing
 endfunc
+
+func Test_autocmd_SafeState()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+	let g:safe = 0
+	let g:again = ''
+	au SafeState * let g:safe += 1
+	au SafeStateAgain * let g:again ..= 'x'
+	func CallTimer()
+	  call timer_start(10, {id -> execute('let g:again ..= "t"')})
+	endfunc
+  END
+  call writefile(lines, 'XSafeState')
+  let buf = RunVimInTerminal('-S XSafeState', #{rows: 6})
+
+  call term_sendkeys(buf, ":echo g:safe\<CR>")
+  call WaitForAssert({-> assert_match('^2 ', term_getline(buf, 6))}, 1000)
+
+  call term_sendkeys(buf, ":echo g:again\<CR>")
+  call WaitForAssert({-> assert_match('^xxxx', term_getline(buf, 6))}, 1000)
+
+  call term_sendkeys(buf, ":let g:again = ''\<CR>:call CallTimer()\<CR>")
+  call term_wait(buf)
+  call term_sendkeys(buf, ":echo g:again\<CR>")
+  call WaitForAssert({-> assert_match('xtx', term_getline(buf, 6))}, 1000)
+
+  call StopVimInTerminal(buf)
+  call delete('XSafeState')
+endfunc

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2067,
 /**/
     2066,
 /**/