Issue #20635: Added tests for Tk geometry managers.

Lib/tkinter/test/widget_tests.py

@@ -33,6 +33,17 @@ class AbstractWidgetTest:
         if not self.root.wantobjects():
             self.wantobjects = False
 
+    def tearDown(self):
+        for w in self.root.winfo_children():
+            w.destroy()
+
+    def _str(self, value):
+        if 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)