vim-patch:9.0.1779: Need more state() tests (neovim#24840)

Problem:  Need more state() tests
Solution: Add a few more tests for operater pending mode and register
          yank command

closes: vim/vim#12883

vim/vim@8dabccd

test/functional/vimscript/state_spec.lua

@@ -10,6 +10,7 @@ local poke_eventloop = helpers.poke_eventloop
 before_each(clear)
 
 describe('state() function', function()
+ -- oldtest: Test_state()
  it('works', function()
  meths.ui_attach(80, 24, {}) -- Allow hit-enter-prompt
 
@@ -51,6 +52,20 @@ describe('state() function', function()
  feed(';')
  eq({ 'mS', 'n' }, exec_lua('return _G.res'))
 
+ -- An operator is pending
+ feed([[:call RunTimer()<CR>y]])
+ poke_eventloop() -- Process pending input
+ poke_eventloop() -- Process time_event
+ feed('y')
+ eq({ 'oSc', 'n' }, exec_lua('return _G.res'))
+
+ -- A register was specified
+ feed([[:call RunTimer()<CR>"r]])
+ poke_eventloop() -- Process pending input
+ poke_eventloop() -- Process time_event
+ feed('yy')
+ eq({ 'oSc', 'n' }, exec_lua('return _G.res'))
+
  -- Insert mode completion
  feed([[:call RunTimer()<CR>Got<C-N>]])
  poke_eventloop() -- Process pending input

test/old/testdir/test_functions.vim

@@ -2630,6 +2630,20 @@ func Test_state()
  call term_sendkeys(buf, getstate)
  call WaitForAssert({-> assert_match('state: mSc; mode: n', term_getline(buf, 6))}, 1000)
 
+ " A operator is pending
+ call term_sendkeys(buf, ":call RunTimer()\<CR>y")
+ call TermWait(buf, 25)
+ call term_sendkeys(buf, "y")
+ call term_sendkeys(buf, getstate)
+ call WaitForAssert({-> assert_match('state: oSc; mode: n', term_getline(buf, 6))}, 1000)
+
+ " A register was specified
+ call term_sendkeys(buf, ":call RunTimer()\<CR>\"r")
+ call TermWait(buf, 25)
+ call term_sendkeys(buf, "yy")
+ call term_sendkeys(buf, getstate)
+ call WaitForAssert({-> assert_match('state: oSc; mode: n', term_getline(buf, 6))}, 1000)
+
  " Insert mode completion (bit slower on Mac)
  call term_sendkeys(buf, ":call RunTimer()\<CR>Got\<C-N>")
  call TermWait(buf, 25)