1 files changed, 32 insertions, 19 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