From 5e7e56176f13c480012a1bae975813f9babaa3a5 Mon Sep 17 00:00:00 2001
From: Scott Sanderson <ssanderson@quantopian.com>
Date: Wed, 17 Aug 2016 14:30:41 -0400
Subject: [PATCH] BUG: Fix broken fixture resolution.

Make sure that WithDefaultDateBounds is last in everyone's mro().
---
 zipline/testing/fixtures.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/zipline/testing/fixtures.py b/zipline/testing/fixtures.py
index 88af7f1d..88d31f4d 100644
--- a/zipline/testing/fixtures.py
+++ b/zipline/testing/fixtures.py
@@ -235,6 +235,9 @@ class WithDefaultDateBounds(object):
     ZiplineTestCase mixin which makes it possible to synchronize date bounds
     across fixtures.
 
+    This fixture should always be the last fixture in bases of any fixture or
+    test case that uses it.
+
     Attributes
     ----------
     START_DATE : datetime
@@ -420,7 +423,9 @@ class WithTradingCalendars(object):
             cls.trading_calendars[exchange] = get_calendar(cal_str)
 
 
-class WithTradingEnvironment(WithAssetFinder, WithTradingCalendars):
+class WithTradingEnvironment(WithAssetFinder,
+                             WithTradingCalendars,
+                             WithDefaultDateBounds):
     """
     ZiplineTestCase mixin providing cls.env as a class-level fixture.