TST: Add logging of sim params for perf tracker tests.

These tests use the random simulation parameters, which is leading
to an intermittent failure.

We may want to consider removing the randomness, but in the meantime
the randomness is exposing a case where the cost basis is not the value
expected, so logging the sim parameter values to help track down what
parameters cause the failure.

tests/test_perf_tracking.py

@@ -15,6 +15,7 @@
 
 import collections
 import heapq
+import logging
 import operator
 
 import unittest
@@ -37,6 +38,8 @@ from zipline.utils.factory import create_random_simulation_parameters
 import zipline.protocol
 from zipline.protocol import Event
 
+logger = logging.getLogger('Test Perf Tracking')
+
 onesec = datetime.timedelta(seconds=1)
 oneday = datetime.timedelta(days=1)
 tradingday = datetime.timedelta(hours=6, minutes=30)
@@ -151,6 +154,9 @@ class TestCommissionEvents(unittest.TestCase):
         self.sim_params, self.dt, self.end_dt = \
             create_random_simulation_parameters()
 
+        logger.info("sim_params: %s, dt: %s, end_dt: %s" %
+                    (self.sim_params, self.dt, self.end_dt))
+
         self.sim_params.capital_base = 10e3
 
         self.benchmark_events = benchmark_events_in_range(self.sim_params)