Attempt testing against MySQL.

.travis.yml

@@ -1,6 +1,8 @@
 dist: trusty
 sudo: false
 language: python
+services:
+- mysql
 env:
 - TOXENV=flake8
 - TOXENV=isort
@@ -10,6 +12,8 @@ matrix:
   include:
   - python: 2.7
     env: TOXENV=py27-1.11
+  - python: 2.7
+    env: TOXENV=py27-1.11-mysql DATABASE_BACKEND=mysql DATABASE_NAME=test
   - python: 3.4
     env: TOXENV=py34-1.11
   - python: 3.4

sundial/fields.py

@@ -95,10 +95,11 @@ def from_db_value(self, value, expression, connection, context=None):
             return value
 
         if settings.USE_TZ and not connection.features.supports_timezones:
-            # At this point the value will be in the connection's timezone
-            # even if it's actually stored using self.db_timezone.
-            # Strip the bogus timezone assignment, make it aware in the
-            # appropriate timezone, and convert it it back to UTC.
-            value = timezone.make_aware(value.replace(tzinfo=None), self.db_tzinfo).astimezone(timezone.utc)
+            # At this point the value will be in UTC even if the actual field's
+            # timezone is self.db_timezone. Replace the bogus timezone with the
+            # appropriate one and convert back to the expected UTC.
+            value = timezone.make_aware(
+                value.replace(tzinfo=None), self.db_tzinfo
+            ).astimezone(timezone.utc)
 
         return value

tests/settings.py

@@ -1,12 +1,15 @@
 from __future__ import unicode_literals
 
+import os
+
 SECRET_KEY = 'not-anymore'
 
 TIME_ZONE = 'America/Chicago'
 
 DATABASES = {
     'default': {
-        'ENGINE': 'django.db.backends.sqlite3',
+        'ENGINE': 'django.db.backends.%s' % os.environ.get('DATABASE_BACKEND', 'sqlite3'),
+        'NAME': os.environ.get('DATABASE_NAME', ':memory:')
     }
 }
 

tox.ini

@@ -5,12 +5,16 @@ envlist =
     flake8,
     isort,
     py27-1.11,
+    py27-1.11-mysql,
     py34-{1.11,2.0},
     py35-{1.11,2.0,2.1,master},
     py36-{1.11,2.0,2.1,master},
     py37-{2.0,2.1,master}
 
 [testenv]
+passenv = DATABASE_*
+setenv =
+    mysql: DATABASE_BACKEND=mysql
 basepython =
     py27: python2.7
     py34: python3.4
@@ -27,6 +31,7 @@ deps =
     2.0: Django>=2.0,<2.1
     2.1: Django>=2.1,<2.2
     master: https://github.com/django/django/archive/master.tar.gz
+    mysql: mysqlclient<1.4
 
 [testenv:flake8]
 usedevelop = false