test: add reasons to some skipped tests (#37632)

test/functional/autocmd/termxx_spec.lua

@@ -92,7 +92,7 @@ describe('autocmd TermClose', function()
   end)
 
   it('kills job trapping SIGTERM', function()
-    skip(is_os('win'))
+    skip(is_os('win'), 'N/A for Windows')
     api.nvim_set_option_value('shell', 'sh', {})
     api.nvim_set_option_value('shellcmdflag', '-c', {})
     command(
@@ -118,7 +118,7 @@ describe('autocmd TermClose', function()
   end)
 
   it('kills PTY job trapping SIGHUP and SIGTERM', function()
-    skip(is_os('win'))
+    skip(is_os('win'), 'N/A for Windows')
     api.nvim_set_option_value('shell', 'sh', {})
     api.nvim_set_option_value('shellcmdflag', '-c', {})
     command(

test/functional/ex_cmds/cd_spec.lua

@@ -294,7 +294,7 @@ describe('getcwd()', function()
   end)
 
   it('returns empty string if working directory does not exist', function()
-    skip(is_os('win'))
+    skip(is_os('win'), 'N/A for Windows')
     command('cd ' .. directories.global)
     command("call delete('../" .. directories.global .. "', 'd')")
     eq('', n.eval('getcwd()'))

test/functional/ex_cmds/swapfile_preserve_recover_spec.lua

@@ -114,7 +114,7 @@ describe("preserve and (R)ecover with custom 'directory'", function()
   end)
 
   it('killing TUI process without :preserve #22096', function()
-    t.skip(t.is_os('win'))
+    t.skip(t.is_os('win'), 'n.connect() hangs on Windows')
     local screen0 = Screen.new()
     local child_server = new_pipename()
     fn.jobstart({ nvim_prog, '-u', 'NONE', '-i', 'NONE', '--listen', child_server }, {

test/functional/ui/embed_spec.lua

@@ -284,7 +284,7 @@ describe('--embed UI', function()
   end)
 
   it('closing stdio with another remote UI does not leak memory #36392', function()
-    t.skip(t.is_os('win')) -- n.connect() hangs on Windows
+    t.skip(t.is_os('win'), 'n.connect() hangs on Windows')
     clear({ args_rm = { '--headless' } })
     Screen.new()
     eq(1, #api.nvim_list_uis())

test/functional/ui/messages_spec.lua

@@ -3113,7 +3113,7 @@ aliquip ex ea commodo consequat.]]
 end)
 
 it('pager works in headless mode with UI attached', function()
-  skip(is_os('win'))
+  skip(is_os('win'), 'n.connect() hangs on Windows')
   clear()
   local child_server = assert(n.new_pipename())
   fn.jobstart({ nvim_prog, '--clean', '--headless', '--listen', child_server })