MAINT: Removes references to trading.environment

tests/modelling/test_modelling_algo.py

@@ -203,11 +203,6 @@ class FFCAlgorithmTestCase(TestCase):
         # Do the same checks in before_trading_start
         before_trading_start = handle_data
 
-        # Create fresh trading environment as the algo.run()
-        # method will attempt to write data to disk, and could
-        # violate SQL constraints.
-        trading.environment = trading.TradingEnvironment()
-
         algo = TradingAlgorithm(
             initialize=initialize,
             handle_data=handle_data,

tests/test_algorithm_gen.py

@@ -208,9 +208,6 @@ class AlgorithmGeneratorTestCase(TestCase):
         Ensure the pipeline of generators are in sync, at least as far as
         their current dates.
         """
-        # Ensure we are pointing to the TradingEnvironment for this class
-        trading.environment = AlgorithmGeneratorTestCase.env
-
         sim_params = factory.create_simulation_parameters(
             start=datetime(2008, 1, 1, tzinfo=pytz.utc),
             end=datetime(2008, 1, 5, tzinfo=pytz.utc),