diff --git a/Lib/test/test_tkinter/test_simpledialog.py b/Lib/test/test_tkinter/test_simpledialog.py
index 313ad82e0a2c0d..9549dab963d92f 100644
--- a/Lib/test/test_tkinter/test_simpledialog.py
+++ b/Lib/test/test_tkinter/test_simpledialog.py
@@ -3,14 +3,14 @@
 from test.support import requires, swap_attr
 from test.test_tkinter.support import setUpModule  # noqa: F401
 from test.test_tkinter.support import AbstractDefaultRootTest
-from tkinter.simpledialog import Dialog, askinteger
+from tkinter.simpledialog import SimpleDialog, Dialog, askinteger, askfloat
 
 requires('gui')
 
 
 class DefaultRootTest(AbstractDefaultRootTest, unittest.TestCase):
 
-    def test_askinteger(self):
+    def test_ask(self):
         @staticmethod
         def mock_wait_window(w):
             nonlocal ismapped
@@ -19,18 +19,38 @@ def mock_wait_window(w):
 
         with swap_attr(Dialog, 'wait_window', mock_wait_window):
             ismapped = None
+
             askinteger("Go To Line", "Line number")
             self.assertEqual(ismapped, False)
+            askfloat("Float", "Enter a float")
+            self.assertEqual(ismapped, False)
 
             root = tkinter.Tk()
             ismapped = None
+
             askinteger("Go To Line", "Line number")
             self.assertEqual(ismapped, True)
-            root.destroy()
+            askfloat("Float", "Enter a float")
+            self.assertEqual(ismapped, True)
 
+            root.destroy()
             tkinter.NoDefaultRoot()
+
             self.assertRaises(RuntimeError, askinteger, "Go To Line", "Line number")
+            self.assertRaises(RuntimeError, askfloat, "Float", "Enter a float")
+
+    def test_simpledialog(self):
+        root = tkinter.Tk()
+
+        dialog = SimpleDialog(
+            root,
+            title="title",
+            text="text",
+            buttons=["b1", "b2", "b3"]
+        )
 
+        root.update()
+        root.destroy()
 
 if __name__ == "__main__":
     unittest.main()