gh-54781: Move Lib/tkinter/test/test_ttk/ to Lib/test/test_ttk/ (#94070)

* Move Lib/tkinter/test/test_tkinter/ to Lib/test/test_tkinter/.
* Move Lib/tkinter/test/test_ttk/ to Lib/test/test_ttk/.
* Add Lib/test/test_ttk/__init__.py based on test_ttk_guionly.py.
* Add Lib/test/test_tkinter/__init__.py
* Remove old Lib/test/test_tk.py.
* Remove old Lib/test/test_ttk_guionly.py.
* Add __main__ sub-modules.
* Update imports and update references to rename files.

Lib/test/test_tkinter/support.py

@@ -0,0 +1,135 @@
+import functools
+import tkinter
+import unittest
+
+class AbstractTkTest:
+
+    @classmethod
+    def setUpClass(cls):
+        cls._old_support_default_root = tkinter._support_default_root
+        destroy_default_root()
+        tkinter.NoDefaultRoot()
+        cls.root = tkinter.Tk()
+        cls.wantobjects = cls.root.wantobjects()
+        # De-maximize main window.
+        # Some window managers can maximize new windows.
+        cls.root.wm_state('normal')
+        try:
+            cls.root.wm_attributes('-zoomed', False)
+        except tkinter.TclError:
+            pass
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.root.update_idletasks()
+        cls.root.destroy()
+        del cls.root
+        tkinter._default_root = None
+        tkinter._support_default_root = cls._old_support_default_root
+
+    def setUp(self):
+        self.root.deiconify()
+
+    def tearDown(self):
+        for w in self.root.winfo_children():
+            w.destroy()
+        self.root.withdraw()
+
+
+class AbstractDefaultRootTest:
+
+    def setUp(self):
+        self._old_support_default_root = tkinter._support_default_root
+        destroy_default_root()
+        tkinter._support_default_root = True
+        self.wantobjects = tkinter.wantobjects
+
+    def tearDown(self):
+        destroy_default_root()
+        tkinter._default_root = None
+        tkinter._support_default_root = self._old_support_default_root
+
+    def _test_widget(self, constructor):
+        # no master passing
+        x = constructor()
+        self.assertIsNotNone(tkinter._default_root)
+        self.assertIs(x.master, tkinter._default_root)
+        self.assertIs(x.tk, tkinter._default_root.tk)
+        x.destroy()
+        destroy_default_root()
+        tkinter.NoDefaultRoot()
+        self.assertRaises(RuntimeError, constructor)
+        self.assertFalse(hasattr(tkinter, '_default_root'))
+
+
+def destroy_default_root():
+    if getattr(tkinter, '_default_root', None):
+        tkinter._default_root.update_idletasks()
+        tkinter._default_root.destroy()
+        tkinter._default_root = None
+
+def simulate_mouse_click(widget, x, y):
+    """Generate proper events to click at the x, y position (tries to act
+    like an X server)."""
+    widget.event_generate('<Enter>', x=0, y=0)
+    widget.event_generate('<Motion>', x=x, y=y)
+    widget.event_generate('<ButtonPress-1>', x=x, y=y)
+    widget.event_generate('<ButtonRelease-1>', x=x, y=y)
+
+
+import _tkinter
+tcl_version = tuple(map(int, _tkinter.TCL_VERSION.split('.')))
+
+def requires_tcl(*version):
+    if len(version) <= 2:
+        return unittest.skipUnless(tcl_version >= version,
+            'requires Tcl version >= ' + '.'.join(map(str, version)))
+
+    def deco(test):
+        @functools.wraps(test)
+        def newtest(self):
+            if get_tk_patchlevel() < version:
+                self.skipTest('requires Tcl version >= ' +
+                                '.'.join(map(str, version)))
+            test(self)
+        return newtest
+    return deco
+
+_tk_patchlevel = None
+def get_tk_patchlevel():
+    global _tk_patchlevel
+    if _tk_patchlevel is None:
+        tcl = tkinter.Tcl()
+        _tk_patchlevel = tcl.info_patchlevel()
+    return _tk_patchlevel
+
+units = {
+    'c': 72 / 2.54,     # centimeters
+    'i': 72,            # inches
+    'm': 72 / 25.4,     # millimeters
+    'p': 1,             # points
+}
+
+def pixels_conv(value):
+    return float(value[:-1]) * units[value[-1:]]
+
+def tcl_obj_eq(actual, expected):
+    if actual == expected:
+        return True
+    if isinstance(actual, _tkinter.Tcl_Obj):
+        if isinstance(expected, str):
+            return str(actual) == expected
+    if isinstance(actual, tuple):
+        if isinstance(expected, tuple):
+            return (len(actual) == len(expected) and
+                    all(tcl_obj_eq(act, exp)
+                        for act, exp in zip(actual, expected)))
+    return False
+
+def widget_eq(actual, expected):
+    if actual == expected:
+        return True
+    if isinstance(actual, (str, tkinter.Widget)):
+        if isinstance(expected, (str, tkinter.Widget)):
+            return str(actual) == str(expected)
+    return False