Reduce codes and add comment

Author: aisk

Lib/test/test_msvcrt.py

@@ -61,15 +61,14 @@ def test_get_osfhandle(self):
 
 
 class TestConsoleIO(unittest.TestCase):
+    @requires_resource('gui')  # CREATE_NEW_CONSOLE will creates a "popup" window.
     def run_in_separated_process(self, code):
         # Run test in a seprated process to avoid stdin conflicts.
         # See: gh-110147
         cmd = [sys.executable, '-c', code]
         subprocess.run(cmd, check=True, capture_output=True,
                        creationflags=subprocess.CREATE_NEW_CONSOLE)
 
-
-    @requires_resource('gui')
     def test_kbhit(self):
         code = dedent('''
             import msvcrt
@@ -91,15 +90,13 @@ def check_getwch(self, funcname):
         ''')
         self.run_in_separated_process(code)
 
-    @requires_resource('gui')
     def test_getwch(self):
         self.check_getwch('getwch')
 
     def test_getche(self):
         msvcrt.ungetch(b'c')
         self.assertEqual(msvcrt.getche(), b'c')
 
-    @requires_resource('gui')
     def test_getwche(self):
         self.check_getwch('getwche')