From e8d8fb3295ee6d34fc8430fbf264b997335db390 Mon Sep 17 00:00:00 2001
From: Tim Graham <timograham@gmail.com>
Date: Mon, 19 Dec 2016 18:47:30 -0500
Subject: [PATCH] Added a test for NullBooleanField.formfield().

---
 tests/model_fields/test_booleanfield.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tests/model_fields/test_booleanfield.py b/tests/model_fields/test_booleanfield.py
index f61be4e28a..f295f24980 100644
--- a/tests/model_fields/test_booleanfield.py
+++ b/tests/model_fields/test_booleanfield.py
@@ -1,3 +1,4 @@
+from django import forms
 from django.core.exceptions import ValidationError
 from django.db import IntegrityError, models, transaction
 from django.test import SimpleTestCase, TestCase
@@ -40,6 +41,10 @@ class BooleanFieldTests(TestCase):
         f = models.BooleanField(choices=choices, default=1, null=False)
         self.assertEqual(f.formfield().choices, choices)
 
+    def test_nullbooleanfield_formfield(self):
+        f = models.NullBooleanField()
+        self.assertIsInstance(f.formfield(), forms.NullBooleanField)
+
     def test_return_type(self):
         b = BooleanModel.objects.create(bfield=True)
         b.refresh_from_db()