TST: Prevent some test cases from being split

tests/test_algorithm.py

@@ -101,6 +101,9 @@ from zipline.protocol import DATASOURCE_TYPE
 from zipline.finance.trading import TradingEnvironment
 from zipline.finance.commission import PerShare
 
+# Because test cases appear to reuse some resources.
+_multiprocess_can_split_ = False
+
 
 class TestRecordAlgorithm(TestCase):
     def setUp(self):

tests/test_examples.py

@@ -26,6 +26,9 @@ from nose_parameterized import parameterized
 import os
 from unittest import TestCase
 
+# Otherwise the next line sometimes complains about being run too late.
+_multiprocess_can_split_ = False
+
 matplotlib.use('Agg')