1 files changed, 35 insertions, 0 deletions
diff --git a/Lib/test/test_tkinter/test_simpledialog.py b/Lib/test/test_tkinter/test_simpledialog.py
new file mode 100644
index 00000000000..502f7f7098a
--- /dev/null
+++ b/Lib/test/test_tkinter/test_simpledialog.py
@@ -0,0 +1,35 @@
+import unittest
+import tkinter
+from test.support import requires, swap_attr
+from test.test_tkinter.support import AbstractDefaultRootTest
+from tkinter.simpledialog import Dialog, askinteger
+
+requires('gui')
+
+
+class DefaultRootTest(AbstractDefaultRootTest, unittest.TestCase):
+
+    def test_askinteger(self):
+        @staticmethod
+        def mock_wait_window(w):
+            nonlocal ismapped
+            ismapped = w.master.winfo_ismapped()
+            w.destroy()
+
+        with swap_attr(Dialog, 'wait_window', mock_wait_window):
+            ismapped = None
+            askinteger("Go To Line", "Line number")
+            self.assertEqual(ismapped, False)
+
+            root = tkinter.Tk()
+            ismapped = None
+            askinteger("Go To Line", "Line number")
+            self.assertEqual(ismapped, True)
+            root.destroy()
+
+            tkinter.NoDefaultRoot()
+            self.assertRaises(RuntimeError, askinteger, "Go To Line", "Line number")
+
+
+if __name__ == "__main__":
+    unittest.main()