Issue #22236: Tkinter tests now don't reuse default root window. New root

window is created for every test class.

Fixed Tkinter images copying operations in NoDefaultRoot mode.

Tcl command names generated for "after" callbacks now contains a name of
original function.

12 files changed, 208 insertions, 258 deletions

diff --git a/Lib/tkinter/test/support.py b/Lib/tkinter/test/support.py
index 7ae0cbb..017681f 100644
--- a/Lib/tkinter/test/support.py
+++ b/Lib/tkinter/test/support.py
@@ -3,30 +3,43 @@ import tkinter
 import unittest
 from test.support import requires
 
-def get_tk_root():
-    requires('gui')             # raise exception if tk unavailable
-    try:
-        root = tkinter._default_root
-    except AttributeError:
-        # it is possible to disable default root in Tkinter, although
-        # I haven't seen people doing it (but apparently someone did it
-        # here).
-        root = None
+class AbstractTkTest:
 
-    if root is None:
-        # create a new master only if there isn't one already
-        root = tkinter.Tk()
+    @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
 
-    return root
+    @classmethod
+    def tearDownClass(cls):
+        cls.root.destroy()
+        cls.root = None
+        tkinter._default_root = None
+        tkinter._support_default_root = cls._old_support_default_root
 
-def root_deiconify():
-    root = get_tk_root()
-    root.deiconify()
+    def setUp(self):
+        self.root.deiconify()
 
-def root_withdraw():
-    root = get_tk_root()
-    root.withdraw()
+    def tearDown(self):
+        for w in self.root.winfo_children():
+            w.destroy()
+        self.root.withdraw()
 
+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
diff --git a/Lib/tkinter/test/test_tkinter/test_font.py b/Lib/tkinter/test/test_tkinter/test_font.py
index dfd630b..09c963e 100644
--- a/Lib/tkinter/test/test_tkinter/test_font.py
+++ b/Lib/tkinter/test/test_tkinter/test_font.py
@@ -2,26 +2,20 @@ import unittest
 import tkinter
 from tkinter import font
 from test.support import requires, run_unittest
-import tkinter.test.support as support
+from tkinter.test.support import AbstractTkTest
 
 requires('gui')
 
-class FontTest(unittest.TestCase):
-
-    def setUp(self):
-        support.root_deiconify()
-
-    def tearDown(self):
-        support.root_withdraw()
+class FontTest(AbstractTkTest, unittest.TestCase):
 
     def test_font_eq(self):
         fontname = "TkDefaultFont"
         try:
-            f = font.Font(name=fontname, exists=True)
+            f = font.Font(root=self.root, name=fontname, exists=True)
         except tkinter._tkinter.TclError:
-            f = font.Font(name=fontname, exists=False)
-        font1 = font.nametofont(fontname)
-        font2 = font.nametofont(fontname)
+            f = font.Font(root=self.root, name=fontname, exists=False)
+        font1 = font.Font(root=self.root, name=fontname, exists=True)
+        font2 = font.Font(root=self.root, name=fontname, exists=True)
         self.assertIsNot(font1, font2)
         self.assertEqual(font1, font2)
         self.assertNotEqual(font1, font1.copy())
diff --git a/Lib/tkinter/test/test_tkinter/test_geometry_managers.py b/Lib/tkinter/test/test_tkinter/test_geometry_managers.py
index fe37409..e42b1be 100644
--- a/Lib/tkinter/test/test_tkinter/test_geometry_managers.py
+++ b/Lib/tkinter/test/test_tkinter/test_geometry_managers.py
@@ -278,7 +278,7 @@ class PlaceTest(AbstractWidgetTest, unittest.TestCase):
 
     def create2(self):
         t = tkinter.Toplevel(self.root, width=300, height=200, bd=0)
-        t.wm_geometry('+0+0')
+        t.wm_geometry('300x200+0+0')
         f = tkinter.Frame(t, width=154, height=84, bd=2, relief='raised')
         f.place_configure(x=48, y=38)
         f2 = tkinter.Frame(t, width=30, height=60, bd=2, relief='raised')
@@ -479,7 +479,6 @@ class PlaceTest(AbstractWidgetTest, unittest.TestCase):
 class GridTest(AbstractWidgetTest, unittest.TestCase):
 
     def tearDown(self):
-        super().tearDown()
         cols, rows = self.root.grid_size()
         for i in range(cols + 1):
             self.root.grid_columnconfigure(i, weight=0, minsize=0, pad=0, uniform='')
@@ -488,10 +487,10 @@ class GridTest(AbstractWidgetTest, unittest.TestCase):
         self.root.grid_propagate(1)
         if tcl_version >= (8, 5):
             self.root.grid_anchor('nw')
+        super().tearDown()
 
     def test_grid_configure(self):
         b = tkinter.Button(self.root)
-        self.addCleanup(b.destroy)
         self.assertEqual(b.grid_info(), {})
         b.grid_configure()
         self.assertEqual(b.grid_info()['in'], self.root)
@@ -578,7 +577,6 @@ class GridTest(AbstractWidgetTest, unittest.TestCase):
 
     def test_grid_configure_row(self):
         b = tkinter.Button(self.root)
-        self.addCleanup(b.destroy)
         with self.assertRaisesRegex(TclError, 'bad (row|grid) value "-1": '
                                     'must be a non-negative integer'):
             b.grid_configure(row=-1)
@@ -795,7 +793,7 @@ class GridTest(AbstractWidgetTest, unittest.TestCase):
             self.root.grid_bbox(0, 0, 0, 'x')
         with self.assertRaises(TypeError):
             self.root.grid_bbox(0, 0, 0, 0, 0)
-        t = tkinter.Toplevel(self.root)
+        t = self.root
         # de-maximize
         t.wm_geometry('1x1+0+0')
         t.wm_geometry('')
@@ -823,7 +821,7 @@ class GridTest(AbstractWidgetTest, unittest.TestCase):
             self.root.grid_location('x', 'y')
         with self.assertRaisesRegex(TclError, 'bad screen distance "y"'):
             self.root.grid_location('1c', 'y')
-        t = tkinter.Toplevel(self.root)
+        t = self.root
         # de-maximize
         t.wm_geometry('1x1+0+0')
         t.wm_geometry('')
diff --git a/Lib/tkinter/test/test_tkinter/test_images.py b/Lib/tkinter/test/test_tkinter/test_images.py
index ff05bbe..85a8cd0 100644
--- a/Lib/tkinter/test/test_tkinter/test_images.py
+++ b/Lib/tkinter/test/test_tkinter/test_images.py
@@ -1,16 +1,12 @@
 import unittest
 import tkinter
-from tkinter import ttk
 from test import support
-from tkinter.test.support import requires_tcl
+from tkinter.test.support import AbstractTkTest, requires_tcl
 
 support.requires('gui')
 
 
-class MiscTest(unittest.TestCase):
-
-    def setUp(self):
-        self.root = ttk.setup_master()
+class MiscTest(AbstractTkTest, unittest.TestCase):
 
     def test_image_types(self):
         image_types = self.root.image_types()
@@ -23,15 +19,13 @@ class MiscTest(unittest.TestCase):
         self.assertIsInstance(image_names, tuple)
 
 
-class BitmapImageTest(unittest.TestCase):
+class BitmapImageTest(AbstractTkTest, unittest.TestCase):
 
     @classmethod
     def setUpClass(cls):
+        AbstractTkTest.setUpClass.__func__(cls)
         cls.testfile = support.findfile('python.xbm', subdir='imghdrdata')
 
-    def setUp(self):
-        self.root = ttk.setup_master()
-
     def test_create_from_file(self):
         image = tkinter.BitmapImage('::img::test', master=self.root,
                                     foreground='yellow', background='blue',
@@ -107,16 +101,13 @@ class BitmapImageTest(unittest.TestCase):
                          '-foreground {} {} #000000 yellow')
 
 
-class PhotoImageTest(unittest.TestCase):
+class PhotoImageTest(AbstractTkTest, unittest.TestCase):
 
     @classmethod
     def setUpClass(cls):
+        AbstractTkTest.setUpClass.__func__(cls)
         cls.testfile = support.findfile('python.gif', subdir='imghdrdata')
 
-    def setUp(self):
-        self.root = ttk.setup_master()
-        self.wantobjects = self.root.wantobjects()
-
     def create(self):
         return tkinter.PhotoImage('::img::test', master=self.root,
                                   file=self.testfile)
diff --git a/Lib/tkinter/test/test_tkinter/test_misc.py b/Lib/tkinter/test/test_tkinter/test_misc.py
index 46f5170..85ee2c7 100644
--- a/Lib/tkinter/test/test_tkinter/test_misc.py
+++ b/Lib/tkinter/test/test_tkinter/test_misc.py
@@ -1,14 +1,11 @@
 import unittest
 import tkinter
-from tkinter import ttk
 from test import support
+from tkinter.test.support import AbstractTkTest
 
 support.requires('gui')
 
-class MiscTest(unittest.TestCase):
-
-    def setUp(self):
-        self.root = ttk.setup_master()
+class MiscTest(AbstractTkTest, unittest.TestCase):
 
     def test_repr(self):
         t = tkinter.Toplevel(self.root, name='top')
diff --git a/Lib/tkinter/test/test_tkinter/test_text.py b/Lib/tkinter/test/test_tkinter/test_text.py
index 4c3fa04..13b7c56 100644
--- a/Lib/tkinter/test/test_tkinter/test_text.py
+++ b/Lib/tkinter/test/test_tkinter/test_text.py
@@ -1,19 +1,16 @@
 import unittest
 import tkinter
 from test.support import requires, run_unittest
-from tkinter.ttk import setup_master
+from tkinter.test.support import AbstractTkTest
 
 requires('gui')
 
-class TextTest(unittest.TestCase):
+class TextTest(AbstractTkTest, unittest.TestCase):
 
     def setUp(self):
-        self.root = setup_master()
+        super().setUp()
         self.text = tkinter.Text(self.root)
 
-    def tearDown(self):
-        self.text.destroy()
-
     def test_debug(self):
         text = self.text
         olddebug = text.debug()
diff --git a/Lib/tkinter/test/test_tkinter/test_variables.py b/Lib/tkinter/test/test_tkinter/test_variables.py
index 9d910ac..7b7e299 100644
--- a/Lib/tkinter/test/test_tkinter/test_variables.py
+++ b/Lib/tkinter/test/test_tkinter/test_variables.py
@@ -1,6 +1,6 @@
 import unittest
 
-from tkinter import Variable, StringVar, IntVar, DoubleVar, BooleanVar, Tk
+from tkinter import Variable, StringVar, IntVar, DoubleVar, BooleanVar, Tcl
 
 
 class Var(Variable):
@@ -16,10 +16,10 @@ class Var(Variable):
 class TestBase(unittest.TestCase):
 
     def setUp(self):
-        self.root = Tk()
+        self.root = Tcl()
 
     def tearDown(self):
-        self.root.destroy()
+        del self.root
 
 
 class TestVariable(TestBase):
@@ -81,7 +81,7 @@ class TestVariable(TestBase):
             self.root.setvar(b'var\x00name', "value")
 
     def test_initialize(self):
-        v = Var()
+        v = Var(self.root)
         self.assertFalse(v.side_effect)
         v.set("value")
         self.assertTrue(v.side_effect)
diff --git a/Lib/tkinter/test/test_tkinter/test_widgets.py b/Lib/tkinter/test/test_tkinter/test_widgets.py
index 6e3836f..25b1a02 100644
--- a/Lib/tkinter/test/test_tkinter/test_widgets.py
+++ b/Lib/tkinter/test/test_tkinter/test_widgets.py
@@ -66,7 +66,7 @@ class ToplevelTest(AbstractToplevelTest, unittest.TestCase):
         'takefocus', 'use', 'visual', 'width',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Toplevel(self.root, **kwargs)
 
     def test_menu(self):
@@ -105,7 +105,7 @@ class FrameTest(AbstractToplevelTest, unittest.TestCase):
         'relief', 'takefocus', 'visual', 'width',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Frame(self.root, **kwargs)
 
 
@@ -120,7 +120,7 @@ class LabelFrameTest(AbstractToplevelTest, unittest.TestCase):
         'takefocus', 'text', 'visual', 'width',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.LabelFrame(self.root, **kwargs)
 
     def test_labelanchor(self):
@@ -158,7 +158,7 @@ class LabelTest(AbstractLabelTest, unittest.TestCase):
         'underline', 'width', 'wraplength',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Label(self.root, **kwargs)
 
 
@@ -175,7 +175,7 @@ class ButtonTest(AbstractLabelTest, unittest.TestCase):
         'state', 'takefocus', 'text', 'textvariable',
         'underline', 'width', 'wraplength')
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Button(self.root, **kwargs)
 
     def test_default(self):
@@ -199,7 +199,7 @@ class CheckbuttonTest(AbstractLabelTest, unittest.TestCase):
         'underline', 'variable', 'width', 'wraplength',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Checkbutton(self.root, **kwargs)
 
 
@@ -227,7 +227,7 @@ class RadiobuttonTest(AbstractLabelTest, unittest.TestCase):
         'underline', 'value', 'variable', 'width', 'wraplength',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Radiobutton(self.root, **kwargs)
 
     def test_value(self):
@@ -250,7 +250,7 @@ class MenubuttonTest(AbstractLabelTest, unittest.TestCase):
     )
     _conv_pixels = staticmethod(pixels_round)
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Menubutton(self.root, **kwargs)
 
     def test_direction(self):
@@ -268,7 +268,7 @@ class MenubuttonTest(AbstractLabelTest, unittest.TestCase):
                      'crashes with Cocoa Tk (issue19733)')
     def test_image(self):
         widget = self.create()
-        image = tkinter.PhotoImage('image1')
+        image = tkinter.PhotoImage(master=self.root, name='image1')
         self.checkParam(widget, 'image', image, conv=str)
         errmsg = 'image "spam" doesn\'t exist'
         with self.assertRaises(tkinter.TclError) as cm:
@@ -303,7 +303,7 @@ class MenubuttonTest(AbstractLabelTest, unittest.TestCase):
 
 class OptionMenuTest(MenubuttonTest, unittest.TestCase):
 
-    def _create(self, default='b', values=('a', 'b', 'c'), **kwargs):
+    def create(self, default='b', values=('a', 'b', 'c'), **kwargs):
         return tkinter.OptionMenu(self.root, None, default, *values, **kwargs)
 
 
@@ -322,7 +322,7 @@ class EntryTest(AbstractWidgetTest, unittest.TestCase):
         'validate', 'validatecommand', 'width', 'xscrollcommand',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Entry(self.root, **kwargs)
 
     def test_disabledbackground(self):
@@ -396,7 +396,7 @@ class SpinboxTest(EntryTest, unittest.TestCase):
         'width', 'wrap', 'xscrollcommand',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Spinbox(self.root, **kwargs)
 
     test_show = None
@@ -490,9 +490,9 @@ class TextTest(AbstractWidgetTest, unittest.TestCase):
         'xscrollcommand', 'yscrollcommand',
     )
     if tcl_version < (8, 5):
-        wantobjects = False
+        _stringify = True
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Text(self.root, **kwargs)
 
     def test_autoseparators(self):
@@ -644,9 +644,9 @@ class CanvasTest(AbstractWidgetTest, unittest.TestCase):
     )
 
     _conv_pixels = round
-    wantobjects = False
+    _stringify = True
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Canvas(self.root, **kwargs)
 
     def test_closeenough(self):
@@ -699,7 +699,7 @@ class ListboxTest(AbstractWidgetTest, unittest.TestCase):
         'takefocus', 'width', 'xscrollcommand', 'yscrollcommand',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Listbox(self.root, **kwargs)
 
     def test_activestyle(self):
@@ -709,7 +709,7 @@ class ListboxTest(AbstractWidgetTest, unittest.TestCase):
 
     def test_listvariable(self):
         widget = self.create()
-        var = tkinter.DoubleVar()
+        var = tkinter.DoubleVar(self.root)
         self.checkVariableParam(widget, 'listvariable', var)
 
     def test_selectmode(self):
@@ -831,7 +831,7 @@ class ScaleTest(AbstractWidgetTest, unittest.TestCase):
     )
     default_orient = 'vertical'
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Scale(self.root, **kwargs)
 
     def test_bigincrement(self):
@@ -897,10 +897,10 @@ class ScrollbarTest(AbstractWidgetTest, unittest.TestCase):
         'takefocus', 'troughcolor', 'width',
     )
     _conv_pixels = round
-    wantobjects = False
+    _stringify = True
     default_orient = 'vertical'
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Scrollbar(self.root, **kwargs)
 
     def test_activerelief(self):
@@ -947,7 +947,7 @@ class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
     )
     default_orient = 'horizontal'
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.PanedWindow(self.root, **kwargs)
 
     def test_handlepad(self):
@@ -1105,7 +1105,7 @@ class MenuTest(AbstractWidgetTest, unittest.TestCase):
     )
     _conv_pixels = noconv
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Menu(self.root, **kwargs)
 
     def test_postcommand(self):
@@ -1174,7 +1174,7 @@ class MessageTest(AbstractWidgetTest, unittest.TestCase):
     )
     _conv_pad_pixels = noconv
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return tkinter.Message(self.root, **kwargs)
 
     def test_aspect(self):
diff --git a/Lib/tkinter/test/test_ttk/test_extensions.py b/Lib/tkinter/test/test_ttk/test_extensions.py
index d699546..c3af06c 100644
--- a/Lib/tkinter/test/test_ttk/test_extensions.py
+++ b/Lib/tkinter/test/test_ttk/test_extensions.py
@@ -2,34 +2,30 @@ import sys
 import unittest
 import tkinter
 from tkinter import ttk
-from test.support import requires, run_unittest
-
-import tkinter.test.support as support
+from test.support import requires, run_unittest, swap_attr
+from tkinter.test.support import AbstractTkTest, destroy_default_root
 
 requires('gui')
 
-class LabeledScaleTest(unittest.TestCase):
-
-    def setUp(self):
-        support.root_deiconify()
+class LabeledScaleTest(AbstractTkTest, unittest.TestCase):
 
     def tearDown(self):
-        support.root_withdraw()
-
+        self.root.update_idletasks()
+        super().tearDown()
 
     def test_widget_destroy(self):
         # automatically created variable
-        x = ttk.LabeledScale()
+        x = ttk.LabeledScale(self.root)
         var = x._variable._name
         x.destroy()
         self.assertRaises(tkinter.TclError, x.tk.globalgetvar, var)
 
         # manually created variable
-        myvar = tkinter.DoubleVar()
+        myvar = tkinter.DoubleVar(self.root)
         name = myvar._name
-        x = ttk.LabeledScale(variable=myvar)
+        x = ttk.LabeledScale(self.root, variable=myvar)
         x.destroy()
-        if x.tk.wantobjects():
+        if self.wantobjects:
             self.assertEqual(x.tk.globalgetvar(name), myvar.get())
         else:
             self.assertEqual(float(x.tk.globalgetvar(name)), myvar.get())
@@ -37,26 +33,36 @@ class LabeledScaleTest(unittest.TestCase):
         self.assertRaises(tkinter.TclError, x.tk.globalgetvar, name)
 
         # checking that the tracing callback is properly removed
-        myvar = tkinter.IntVar()
+        myvar = tkinter.IntVar(self.root)
         # LabeledScale will start tracing myvar
-        x = ttk.LabeledScale(variable=myvar)
+        x = ttk.LabeledScale(self.root, variable=myvar)
         x.destroy()
         # Unless the tracing callback was removed, creating a new
         # LabeledScale with the same var will cause an error now. This
         # happens because the variable will be set to (possibly) a new
         # value which causes the tracing callback to be called and then
         # it tries calling instance attributes not yet defined.
-        ttk.LabeledScale(variable=myvar)
+        ttk.LabeledScale(self.root, variable=myvar)
         if hasattr(sys, 'last_type'):
             self.assertNotEqual(sys.last_type, tkinter.TclError)
 
 
+    def test_initialization_no_master(self):
+        # no master passing
+        with swap_attr(tkinter, '_default_root', None), \
+             swap_attr(tkinter, '_support_default_root', True):
+            try:
+                x = ttk.LabeledScale()
+                self.assertIsNotNone(tkinter._default_root)
+                self.assertEqual(x.master, tkinter._default_root)
+                self.assertEqual(x.tk, tkinter._default_root.tk)
+                x.destroy()
+            finally:
+                destroy_default_root()
+
     def test_initialization(self):
         # master passing
-        x = ttk.LabeledScale()
-        self.assertEqual(x.master, tkinter._default_root)
-        x.destroy()
-        master = tkinter.Frame()
+        master = tkinter.Frame(self.root)
         x = ttk.LabeledScale(master)
         self.assertEqual(x.master, master)
         x.destroy()
@@ -64,25 +70,25 @@ class LabeledScaleTest(unittest.TestCase):
         # variable initialization/passing
         passed_expected = (('0', 0), (0, 0), (10, 10),
             (-1, -1), (sys.maxsize + 1, sys.maxsize + 1))
-        if x.tk.wantobjects():
+        if self.wantobjects:
             passed_expected += ((2.5, 2),)
         for pair in passed_expected:
-            x = ttk.LabeledScale(from_=pair[0])
+            x = ttk.LabeledScale(self.root, from_=pair[0])
             self.assertEqual(x.value, pair[1])
             x.destroy()
-        x = ttk.LabeledScale(from_='2.5')
+        x = ttk.LabeledScale(self.root, from_='2.5')
         self.assertRaises(ValueError, x._variable.get)
         x.destroy()
-        x = ttk.LabeledScale(from_=None)
+        x = ttk.LabeledScale(self.root, from_=None)
         self.assertRaises(ValueError, x._variable.get)
         x.destroy()
         # variable should have its default value set to the from_ value
-        myvar = tkinter.DoubleVar(value=20)
-        x = ttk.LabeledScale(variable=myvar)
+        myvar = tkinter.DoubleVar(self.root, value=20)
+        x = ttk.LabeledScale(self.root, variable=myvar)
         self.assertEqual(x.value, 0)
         x.destroy()
         # check that it is really using a DoubleVar
-        x = ttk.LabeledScale(variable=myvar, from_=0.5)
+        x = ttk.LabeledScale(self.root, variable=myvar, from_=0.5)
         self.assertEqual(x.value, 0.5)
         self.assertEqual(x._variable._name, myvar._name)
         x.destroy()
@@ -91,25 +97,26 @@ class LabeledScaleTest(unittest.TestCase):
         def check_positions(scale, scale_pos, label, label_pos):
             self.assertEqual(scale.pack_info()['side'], scale_pos)
             self.assertEqual(label.place_info()['anchor'], label_pos)
-        x = ttk.LabeledScale(compound='top')
+        x = ttk.LabeledScale(self.root, compound='top')
         check_positions(x.scale, 'bottom', x.label, 'n')
         x.destroy()
-        x = ttk.LabeledScale(compound='bottom')
+        x = ttk.LabeledScale(self.root, compound='bottom')
         check_positions(x.scale, 'top', x.label, 's')
         x.destroy()
-        x = ttk.LabeledScale(compound='unknown') # invert default positions
+        # invert default positions
+        x = ttk.LabeledScale(self.root, compound='unknown')
         check_positions(x.scale, 'top', x.label, 's')
         x.destroy()
-        x = ttk.LabeledScale() # take default positions
+        x = ttk.LabeledScale(self.root) # take default positions
         check_positions(x.scale, 'bottom', x.label, 'n')
         x.destroy()
 
         # extra, and invalid, kwargs
-        self.assertRaises(tkinter.TclError, ttk.LabeledScale, a='b')
+        self.assertRaises(tkinter.TclError, ttk.LabeledScale, master, a='b')
 
 
     def test_horizontal_range(self):
-        lscale = ttk.LabeledScale(from_=0, to=10)
+        lscale = ttk.LabeledScale(self.root, from_=0, to=10)
         lscale.pack()
         lscale.wait_visibility()
         lscale.update()
@@ -128,7 +135,7 @@ class LabeledScaleTest(unittest.TestCase):
         self.assertNotEqual(prev_xcoord, curr_xcoord)
         # the label widget should have been repositioned too
         linfo_2 = lscale.label.place_info()
-        self.assertEqual(lscale.label['text'], 0 if lscale.tk.wantobjects() else '0')
+        self.assertEqual(lscale.label['text'], 0 if self.wantobjects else '0')
         self.assertEqual(curr_xcoord, int(linfo_2['x']))
         # change the range back
         lscale.scale.configure(from_=0, to=10)
@@ -139,7 +146,7 @@ class LabeledScaleTest(unittest.TestCase):
 
 
     def test_variable_change(self):
-        x = ttk.LabeledScale()
+        x = ttk.LabeledScale(self.root)
         x.pack()
         x.wait_visibility()
         x.update()
@@ -151,13 +158,13 @@ class LabeledScaleTest(unittest.TestCase):
         # at the same time this shouldn't affect test outcome
         x.update()
         self.assertEqual(x.label['text'],
-                         newval if x.tk.wantobjects() else str(newval))
+                         newval if self.wantobjects else str(newval))
         self.assertGreater(x.scale.coords()[0], curr_xcoord)
         self.assertEqual(x.scale.coords()[0],
             int(x.label.place_info()['x']))
 
         # value outside range
-        if x.tk.wantobjects():
+        if self.wantobjects:
             conv = lambda x: x
         else:
             conv = int
@@ -171,7 +178,7 @@ class LabeledScaleTest(unittest.TestCase):
 
 
     def test_resize(self):
-        x = ttk.LabeledScale()
+        x = ttk.LabeledScale(self.root)
         x.pack(expand=True, fill='both')
         x.wait_visibility()
         x.update()
@@ -190,20 +197,20 @@ class LabeledScaleTest(unittest.TestCase):
         x.destroy()
 
 
-class OptionMenuTest(unittest.TestCase):
+class OptionMenuTest(AbstractTkTest, unittest.TestCase):
 
     def setUp(self):
-        support.root_deiconify()
-        self.textvar = tkinter.StringVar()
+        super().setUp()
+        self.textvar = tkinter.StringVar(self.root)
 
     def tearDown(self):
         del self.textvar
-        support.root_withdraw()
+        super().tearDown()
 
 
     def test_widget_destroy(self):
-        var = tkinter.StringVar()
-        optmenu = ttk.OptionMenu(None, var)
+        var = tkinter.StringVar(self.root)
+        optmenu = ttk.OptionMenu(self.root, var)
         name = var._name
         optmenu.update_idletasks()
         optmenu.destroy()
@@ -214,9 +221,9 @@ class OptionMenuTest(unittest.TestCase):
 
     def test_initialization(self):
         self.assertRaises(tkinter.TclError,
-            ttk.OptionMenu, None, self.textvar, invalid='thing')
+            ttk.OptionMenu, self.root, self.textvar, invalid='thing')
 
-        optmenu = ttk.OptionMenu(None, self.textvar, 'b', 'a', 'b')
+        optmenu = ttk.OptionMenu(self.root, self.textvar, 'b', 'a', 'b')
         self.assertEqual(optmenu._variable.get(), 'b')
 
         self.assertTrue(optmenu['menu'])
@@ -228,7 +235,7 @@ class OptionMenuTest(unittest.TestCase):
     def test_menu(self):
         items = ('a', 'b', 'c')
         default = 'a'
-        optmenu = ttk.OptionMenu(None, self.textvar, default, *items)
+        optmenu = ttk.OptionMenu(self.root, self.textvar, default, *items)
         found_default = False
         for i in range(len(items)):
             value = optmenu['menu'].entrycget(i, 'value')
@@ -240,7 +247,7 @@ class OptionMenuTest(unittest.TestCase):
 
         # default shouldn't be in menu if it is not part of values
         default = 'd'
-        optmenu = ttk.OptionMenu(None, self.textvar, default, *items)
+        optmenu = ttk.OptionMenu(self.root, self.textvar, default, *items)
         curr = None
         i = 0
         while True:
@@ -269,7 +276,7 @@ class OptionMenuTest(unittest.TestCase):
         def cb_test(item):
             self.assertEqual(item, items[1])
             success.append(True)
-        optmenu = ttk.OptionMenu(None, self.textvar, 'a', command=cb_test,
+        optmenu = ttk.OptionMenu(self.root, self.textvar, 'a', command=cb_test,
             *items)
         optmenu['menu'].invoke(1)
         if not success:
diff --git a/Lib/tkinter/test/test_ttk/test_style.py b/Lib/tkinter/test/test_ttk/test_style.py
index 0da0e5d..3537536 100644
--- a/Lib/tkinter/test/test_ttk/test_style.py
+++ b/Lib/tkinter/test/test_ttk/test_style.py
@@ -2,15 +2,15 @@ import unittest
 import tkinter
 from tkinter import ttk
 from test.support import requires, run_unittest
-
-import tkinter.test.support as support
+from tkinter.test.support import AbstractTkTest
 
 requires('gui')
 
-class StyleTest(unittest.TestCase):
+class StyleTest(AbstractTkTest, unittest.TestCase):
 
     def setUp(self):
-        self.style = ttk.Style()
+        super().setUp()
+        self.style = ttk.Style(self.root)
 
 
     def test_configure(self):
@@ -25,7 +25,7 @@ class StyleTest(unittest.TestCase):
         style = self.style
         style.map('TButton', background=[('active', 'background', 'blue')])
         self.assertEqual(style.map('TButton', 'background'),
-            [('active', 'background', 'blue')] if style.tk.wantobjects() else
+            [('active', 'background', 'blue')] if self.wantobjects else
             [('active background', 'blue')])
         self.assertIsInstance(style.map('TButton'), dict)
 
diff --git a/Lib/tkinter/test/test_ttk/test_widgets.py b/Lib/tkinter/test/test_ttk/test_widgets.py
index 41927dd..f73ac79 100644
--- a/Lib/tkinter/test/test_ttk/test_widgets.py
+++ b/Lib/tkinter/test/test_ttk/test_widgets.py
@@ -4,9 +4,9 @@ from tkinter import ttk
 from test.support import requires
 import sys
 
-import tkinter.test.support as support
 from tkinter.test.test_ttk.test_functions import MockTclObj
-from tkinter.test.support import tcl_version, get_tk_patchlevel
+from tkinter.test.support import (AbstractTkTest, tcl_version, get_tk_patchlevel,
+                                  simulate_mouse_click)
 from tkinter.test.widget_tests import (add_standard_options, noconv,
     AbstractWidgetTest, StandardOptionsTests, IntegerSizeTests, PixelSizeTests,
     setUpModule)
@@ -53,19 +53,15 @@ class StandardTtkOptionsTests(StandardOptionsTests):
         pass
 
 
-class WidgetTest(unittest.TestCase):
+class WidgetTest(AbstractTkTest, unittest.TestCase):
     """Tests methods available in every ttk widget."""
 
     def setUp(self):
-        support.root_deiconify()
-        self.widget = ttk.Button(width=0, text="Text")
+        super().setUp()
+        self.widget = ttk.Button(self.root, width=0, text="Text")
         self.widget.pack()
         self.widget.wait_visibility()
 
-    def tearDown(self):
-        self.widget.destroy()
-        support.root_withdraw()
-
 
     def test_identify(self):
         self.widget.update_idletasks()
@@ -128,7 +124,7 @@ class FrameTest(AbstractToplevelTest, unittest.TestCase):
         'width',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Frame(self.root, **kwargs)
 
 
@@ -141,7 +137,7 @@ class LabelFrameTest(AbstractToplevelTest, unittest.TestCase):
         'text', 'underline', 'width',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.LabelFrame(self.root, **kwargs)
 
     def test_labelanchor(self):
@@ -161,8 +157,8 @@ class LabelFrameTest(AbstractToplevelTest, unittest.TestCase):
 class AbstractLabelTest(AbstractWidgetTest):
 
     def checkImageParam(self, widget, name):
-        image = tkinter.PhotoImage('image1')
-        image2 = tkinter.PhotoImage('image2')
+        image = tkinter.PhotoImage(master=self.root, name='image1')
+        image2 = tkinter.PhotoImage(master=self.root, name='image2')
         self.checkParam(widget, name, image, expected=('image1',))
         self.checkParam(widget, name, 'image1', expected=('image1',))
         self.checkParam(widget, name, (image,), expected=('image1',))
@@ -199,7 +195,7 @@ class LabelTest(AbstractLabelTest, unittest.TestCase):
     )
     _conv_pixels = noconv
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Label(self.root, **kwargs)
 
     def test_font(self):
@@ -216,7 +212,7 @@ class ButtonTest(AbstractLabelTest, unittest.TestCase):
         'underline', 'width',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Button(self.root, **kwargs)
 
     def test_default(self):
@@ -225,7 +221,7 @@ class ButtonTest(AbstractLabelTest, unittest.TestCase):
 
     def test_invoke(self):
         success = []
-        btn = ttk.Button(command=lambda: success.append(1))
+        btn = ttk.Button(self.root, command=lambda: success.append(1))
         btn.invoke()
         self.assertTrue(success)
 
@@ -241,7 +237,7 @@ class CheckbuttonTest(AbstractLabelTest, unittest.TestCase):
         'underline', 'variable', 'width',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Checkbutton(self.root, **kwargs)
 
     def test_offvalue(self):
@@ -258,7 +254,7 @@ class CheckbuttonTest(AbstractLabelTest, unittest.TestCase):
             success.append(1)
             return "cb test called"
 
-        cbtn = ttk.Checkbutton(command=cb_test)
+        cbtn = ttk.Checkbutton(self.root, command=cb_test)
         # the variable automatically created by ttk.Checkbutton is actually
         # undefined till we invoke the Checkbutton
         self.assertEqual(cbtn.state(), ('alternate', ))
@@ -289,15 +285,9 @@ class ComboboxTest(AbstractWidgetTest, unittest.TestCase):
 
     def setUp(self):
         super().setUp()
-        support.root_deiconify()
         self.combo = self.create()
 
-    def tearDown(self):
-        self.combo.destroy()
-        support.root_withdraw()
-        super().tearDown()
-
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Combobox(self.root, **kwargs)
 
     def test_height(self):
@@ -405,7 +395,7 @@ class ComboboxTest(AbstractWidgetTest, unittest.TestCase):
         self.assertRaises(tkinter.TclError, self.combo.current, '')
 
         # testing creating combobox with empty string in values
-        combo2 = ttk.Combobox(values=[1, 2, ''])
+        combo2 = ttk.Combobox(self.root, values=[1, 2, ''])
         self.assertEqual(combo2['values'],
                          ('1', '2', '') if self.wantobjects else '1 2 {}')
         combo2.destroy()
@@ -423,15 +413,9 @@ class EntryTest(AbstractWidgetTest, unittest.TestCase):
 
     def setUp(self):
         super().setUp()
-        support.root_deiconify()
         self.entry = self.create()
 
-    def tearDown(self):
-        self.entry.destroy()
-        support.root_withdraw()
-        super().tearDown()
-
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Entry(self.root, **kwargs)
 
     def test_invalidcommand(self):
@@ -558,15 +542,9 @@ class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
 
     def setUp(self):
         super().setUp()
-        support.root_deiconify()
         self.paned = self.create()
 
-    def tearDown(self):
-        self.paned.destroy()
-        support.root_withdraw()
-        super().tearDown()
-
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.PanedWindow(self.root, **kwargs)
 
     def test_orient(self):
@@ -588,13 +566,13 @@ class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
         label.destroy()
         child.destroy()
         # another attempt
-        label = ttk.Label()
+        label = ttk.Label(self.root)
         child = ttk.Label(label)
         self.assertRaises(tkinter.TclError, self.paned.add, child)
         child.destroy()
         label.destroy()
 
-        good_child = ttk.Label()
+        good_child = ttk.Label(self.root)
         self.paned.add(good_child)
         # re-adding a child is not accepted
         self.assertRaises(tkinter.TclError, self.paned.add, good_child)
@@ -612,7 +590,7 @@ class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
         self.assertRaises(tkinter.TclError, self.paned.forget, None)
         self.assertRaises(tkinter.TclError, self.paned.forget, 0)
 
-        self.paned.add(ttk.Label())
+        self.paned.add(ttk.Label(self.root))
         self.paned.forget(0)
         self.assertRaises(tkinter.TclError, self.paned.forget, 0)
 
@@ -622,9 +600,9 @@ class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
         self.assertRaises(tkinter.TclError, self.paned.insert, 0, None)
         self.assertRaises(tkinter.TclError, self.paned.insert, 0, 0)
 
-        child = ttk.Label()
-        child2 = ttk.Label()
-        child3 = ttk.Label()
+        child = ttk.Label(self.root)
+        child2 = ttk.Label(self.root)
+        child3 = ttk.Label(self.root)
 
         self.assertRaises(tkinter.TclError, self.paned.insert, 0, child)
 
@@ -655,7 +633,7 @@ class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
     def test_pane(self):
         self.assertRaises(tkinter.TclError, self.paned.pane, 0)
 
-        child = ttk.Label()
+        child = ttk.Label(self.root)
         self.paned.add(child)
         self.assertIsInstance(self.paned.pane(0), dict)
         self.assertEqual(self.paned.pane(0, weight=None),
@@ -700,7 +678,7 @@ class RadiobuttonTest(AbstractLabelTest, unittest.TestCase):
         'underline', 'value', 'variable', 'width',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Radiobutton(self.root, **kwargs)
 
     def test_value(self):
@@ -713,9 +691,11 @@ class RadiobuttonTest(AbstractLabelTest, unittest.TestCase):
             success.append(1)
             return "cb test called"
 
-        myvar = tkinter.IntVar()
-        cbtn = ttk.Radiobutton(command=cb_test, variable=myvar, value=0)
-        cbtn2 = ttk.Radiobutton(command=cb_test, variable=myvar, value=1)
+        myvar = tkinter.IntVar(self.root)
+        cbtn = ttk.Radiobutton(self.root, command=cb_test,
+                               variable=myvar, value=0)
+        cbtn2 = ttk.Radiobutton(self.root, command=cb_test,
+                                variable=myvar, value=1)
 
         if self.wantobjects:
             conv = lambda x: x
@@ -748,7 +728,7 @@ class MenubuttonTest(AbstractLabelTest, unittest.TestCase):
         'underline', 'width',
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Menubutton(self.root, **kwargs)
 
     def test_direction(self):
@@ -774,17 +754,11 @@ class ScaleTest(AbstractWidgetTest, unittest.TestCase):
 
     def setUp(self):
         super().setUp()
-        support.root_deiconify()
         self.scale = self.create()
         self.scale.pack()
         self.scale.update()
 
-    def tearDown(self):
-        self.scale.destroy()
-        support.root_withdraw()
-        super().tearDown()
-
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Scale(self.root, **kwargs)
 
     def test_from(self):
@@ -856,7 +830,7 @@ class ScaleTest(AbstractWidgetTest, unittest.TestCase):
         self.assertEqual(conv(self.scale.get()), min)
 
         # changing directly the variable doesn't impose this limitation tho
-        var = tkinter.DoubleVar()
+        var = tkinter.DoubleVar(self.root)
         self.scale['variable'] = var
         var.set(max + 5)
         self.assertEqual(conv(self.scale.get()), var.get())
@@ -886,7 +860,7 @@ class ProgressbarTest(AbstractWidgetTest, unittest.TestCase):
     _conv_pixels = noconv
     default_orient = 'horizontal'
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Progressbar(self.root, **kwargs)
 
     def test_length(self):
@@ -920,7 +894,7 @@ class ScrollbarTest(AbstractWidgetTest, unittest.TestCase):
     )
     default_orient = 'vertical'
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Scrollbar(self.root, **kwargs)
 
 
@@ -932,21 +906,13 @@ class NotebookTest(AbstractWidgetTest, unittest.TestCase):
 
     def setUp(self):
         super().setUp()
-        support.root_deiconify()
         self.nb = self.create(padding=0)
-        self.child1 = ttk.Label()
-        self.child2 = ttk.Label()
+        self.child1 = ttk.Label(self.root)
+        self.child2 = ttk.Label(self.root)
         self.nb.add(self.child1, text='a')
         self.nb.add(self.child2, text='b')
 
-    def tearDown(self):
-        self.child1.destroy()
-        self.child2.destroy()
-        self.nb.destroy()
-        support.root_withdraw()
-        super().tearDown()
-
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Notebook(self.root, **kwargs)
 
     def test_tab_identifiers(self):
@@ -985,7 +951,7 @@ class NotebookTest(AbstractWidgetTest, unittest.TestCase):
         self.assertRaises(tkinter.TclError, self.nb.hide, 'hi')
         self.assertRaises(tkinter.TclError, self.nb.hide, None)
         self.assertRaises(tkinter.TclError, self.nb.add, None)
-        self.assertRaises(tkinter.TclError, self.nb.add, ttk.Label(),
+        self.assertRaises(tkinter.TclError, self.nb.add, ttk.Label(self.root),
             unknown='option')
 
         tabs = self.nb.tabs()
@@ -993,7 +959,7 @@ class NotebookTest(AbstractWidgetTest, unittest.TestCase):
         self.nb.add(self.child1)
         self.assertEqual(self.nb.tabs(), tabs)
 
-        child = ttk.Label()
+        child = ttk.Label(self.root)
         self.nb.add(child, text='c')
         tabs = self.nb.tabs()
 
@@ -1051,7 +1017,7 @@ class NotebookTest(AbstractWidgetTest, unittest.TestCase):
         self.assertRaises(tkinter.TclError, self.nb.insert, -1, tabs[0])
 
         # new tab
-        child3 = ttk.Label()
+        child3 = ttk.Label(self.root)
         self.nb.insert(1, child3)
         self.assertEqual(self.nb.tabs(), (tabs[0], str(child3), tabs[1]))
         self.nb.forget(child3)
@@ -1117,7 +1083,7 @@ class NotebookTest(AbstractWidgetTest, unittest.TestCase):
 
         self.nb.select(0)
 
-        support.simulate_mouse_click(self.nb, 5, 5)
+        simulate_mouse_click(self.nb, 5, 5)
         self.nb.focus_force()
         self.nb.event_generate('<Control-Tab>')
         self.assertEqual(self.nb.select(), str(self.child2))
@@ -1131,7 +1097,7 @@ class NotebookTest(AbstractWidgetTest, unittest.TestCase):
         self.nb.tab(self.child1, text='a', underline=0)
         self.nb.enable_traversal()
         self.nb.focus_force()
-        support.simulate_mouse_click(self.nb, 5, 5)
+        simulate_mouse_click(self.nb, 5, 5)
         if sys.platform == 'darwin':
             self.nb.event_generate('<Option-a>')
         else:
@@ -1149,15 +1115,9 @@ class TreeviewTest(AbstractWidgetTest, unittest.TestCase):
 
     def setUp(self):
         super().setUp()
-        support.root_deiconify()
         self.tv = self.create(padding=0)
 
-    def tearDown(self):
-        self.tv.destroy()
-        support.root_withdraw()
-        super().tearDown()
-
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Treeview(self.root, **kwargs)
 
     def test_columns(self):
@@ -1393,7 +1353,7 @@ class TreeviewTest(AbstractWidgetTest, unittest.TestCase):
 
     def test_heading_callback(self):
         def simulate_heading_click(x, y):
-            support.simulate_mouse_click(self.tv, x, y)
+            simulate_mouse_click(self.tv, x, y)
             self.tv.update()
 
         success = [] # no success for now
@@ -1582,7 +1542,7 @@ class TreeviewTest(AbstractWidgetTest, unittest.TestCase):
 
         self.assertEqual(len(pos_y), 2) # item1 and item2 y pos
         for y in pos_y:
-            support.simulate_mouse_click(self.tv, 0, y)
+            simulate_mouse_click(self.tv, 0, y)
 
         # by now there should be 4 things in the events list, since each
         # item had a bind for two events that were simulated above
@@ -1612,7 +1572,7 @@ class SeparatorTest(AbstractWidgetTest, unittest.TestCase):
     )
     default_orient = 'horizontal'
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Separator(self.root, **kwargs)
 
 
@@ -1623,7 +1583,7 @@ class SizegripTest(AbstractWidgetTest, unittest.TestCase):
         # 'state'?
     )
 
-    def _create(self, **kwargs):
+    def create(self, **kwargs):
         return ttk.Sizegrip(self.root, **kwargs)
 
 tests_gui = (
diff --git a/Lib/tkinter/test/widget_tests.py b/Lib/tkinter/test/widget_tests.py
index 26bf162..779538d 100644
--- a/Lib/tkinter/test/widget_tests.py
+++ b/Lib/tkinter/test/widget_tests.py
@@ -3,9 +3,9 @@
 import unittest
 import sys
 import tkinter
-from tkinter.ttk import setup_master, Scale
-from tkinter.test.support import (tcl_version, requires_tcl, get_tk_patchlevel,
-                                  pixels_conv, tcl_obj_eq)
+from tkinter.ttk import Scale
+from tkinter.test.support import (AbstractTkTest, tcl_version, requires_tcl,
+                                  get_tk_patchlevel, pixels_conv, tcl_obj_eq)
 import test.support
 
 
@@ -22,33 +22,26 @@ if get_tk_patchlevel()[:3] == (8, 5, 11):
 
 _sentinel = object()
 
-class AbstractWidgetTest:
+class AbstractWidgetTest(AbstractTkTest):
     _conv_pixels = staticmethod(pixels_round)
     _conv_pad_pixels = None
-    wantobjects = True
+    _stringify = False
 
-    def setUp(self):
-        self.root = setup_master()
-        self.scaling = float(self.root.call('tk', 'scaling'))
-        if not self.root.wantobjects():
-            self.wantobjects = False
-
-    def tearDown(self):
-        for w in self.root.winfo_children():
-            w.destroy()
+    @property
+    def scaling(self):
+        try:
+            return self._scaling
+        except AttributeError:
+            self._scaling = float(self.root.call('tk', 'scaling'))
+            return self._scaling
 
     def _str(self, value):
-        if self.wantobjects and tcl_version >= (8, 6):
+        if not self._stringify and self.wantobjects and tcl_version >= (8, 6):
             return value
         if isinstance(value, tuple):
             return ' '.join(map(self._str, value))
         return str(value)
 
-    def create(self, **kwargs):
-        widget = self._create(**kwargs)
-        self.addCleanup(widget.destroy)
-        return widget
-
     def assertEqual2(self, actual, expected, msg=None, eq=object.__eq__):
         if eq(actual, expected):
             return
@@ -61,7 +54,7 @@ class AbstractWidgetTest:
             expected = value
         if conv:
             expected = conv(expected)
-        if not self.wantobjects:
+        if self._stringify or not self.wantobjects:
             if isinstance(expected, tuple):
                 expected = tkinter._join(expected)
             else:
@@ -193,7 +186,7 @@ class AbstractWidgetTest:
                 errmsg=errmsg)
 
     def checkImageParam(self, widget, name):
-        image = tkinter.PhotoImage('image1')
+        image = tkinter.PhotoImage(master=self.root, name='image1')
         self.checkParam(widget, name, image, conv=str)
         self.checkInvalidParam(widget, name, 'spam',
                 errmsg='image "spam" doesn\'t exist')
@@ -414,7 +407,7 @@ class StandardOptionsTests:
 
     def test_textvariable(self):
         widget = self.create()
-        var = tkinter.StringVar()
+        var = tkinter.StringVar(self.root)
         self.checkVariableParam(widget, 'textvariable', var)
 
     def test_troughcolor(self):
@@ -475,7 +468,7 @@ class StandardOptionsTests:
 
     def test_variable(self):
         widget = self.create()
-        var = tkinter.DoubleVar()
+        var = tkinter.DoubleVar(self.root)
         self.checkVariableParam(widget, 'variable', var)