diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index 6ad0cf1..718be6e 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -2908,8 +2908,9 @@
     def debug(self, boolean=None):
         """Turn on the internal consistency checks of the B-Tree inside the text
         widget according to BOOLEAN."""
-        return self.tk.getboolean(self.tk.call(
-            self._w, 'debug', boolean))
+        if boolean is None:
+            return self.tk.call(self._w, 'debug')
+        self.tk.call(self._w, 'debug', boolean)
     def delete(self, index1, index2=None):
         """Delete the characters between INDEX1 and INDEX2 (not included)."""
         self.tk.call(self._w, 'delete', index1, index2)
diff --git a/Lib/lib-tk/test/test_tkinter/test_text.py b/Lib/lib-tk/test/test_tkinter/test_text.py
index e6c08be..ca21b60 100644
--- a/Lib/lib-tk/test/test_tkinter/test_text.py
+++ b/Lib/lib-tk/test/test_tkinter/test_text.py
@@ -14,6 +14,17 @@
     def tearDown(self):
         self.text.destroy()
 
+    def test_debug(self):
+        text = self.text
+        olddebug = text.debug()
+        try:
+            text.debug(0)
+            self.assertEqual(text.debug(), 0)
+            text.debug(1)
+            self.assertEqual(text.debug(), 1)
+        finally:
+            text.debug(olddebug)
+            self.assertEqual(text.debug(), olddebug)
 
     def test_search(self):
         text = self.text
diff --git a/Lib/lib-tk/test/test_tkinter/test_widgets.py b/Lib/lib-tk/test/test_tkinter/test_widgets.py
index cfbc0b3..3042599 100644
--- a/Lib/lib-tk/test/test_tkinter/test_widgets.py
+++ b/Lib/lib-tk/test/test_tkinter/test_widgets.py
@@ -607,6 +607,19 @@
         else:
             self.checkEnumParam(widget, 'wrap', 'char', 'none', 'word')
 
+    def test_bbox(self):
+        widget = self.create()
+        bbox = widget.bbox('1.1')
+        self.assertEqual(len(bbox), 4)
+        for item in bbox:
+            self.assertIsInstance(item, int)
+
+        self.assertIsNone(widget.bbox('end'))
+        self.assertRaises(Tkinter.TclError, widget.bbox, 'noindex')
+        self.assertRaises(Tkinter.TclError, widget.bbox, None)
+        self.assertRaises(Tkinter.TclError, widget.bbox)
+        self.assertRaises(Tkinter.TclError, widget.bbox, '1.1', 'end')
+
 
 @add_standard_options(PixelSizeTests, StandardOptionsTests)
 class CanvasTest(AbstractWidgetTest, unittest.TestCase):