tests: Use direct values instead of raw SQL

Supercedes disqus#11.

Fixes: eea01c6 (use the db_column attribute of a model field if set https://docs.djangoproject.com/en/dev/ref/models/fields/#db-column, 2012-01-05)

Author: iamahuman

bitfield/tests/tests.py

@@ -155,11 +155,12 @@ def test_regression_1425(self):
         self.assertTrue(instance.flags.FLAG_2)
         self.assertTrue(instance.flags.FLAG_3)
 
-        cursor = connection.cursor()
-        flags_field = BitFieldTestModel._meta.get_field('flags')
-        flags_db_column = flags_field.db_column or flags_field.name
-        cursor.execute("INSERT INTO %s (%s) VALUES (-1)" % (BitFieldTestModel._meta.db_table, flags_db_column))
-        # There should only be the one row we inserted through the cursor.
+        # Bypass BitField.to_python and insert (-1) directly.
+        instance = BitFieldTestModel()
+        instance.__dict__['flags'] = models.Value(-1, output_field=models.IntegerField())
+        instance.save()
+
+        # There should only be the one row we inserted with a direct value.
         instance = BitFieldTestModel.objects.get(flags=-1)
         self.assertTrue(instance.flags.FLAG_0)
         self.assertTrue(instance.flags.FLAG_1)