Getting error with Chapter 7, Trading Strategy Unit Test

[jbh1128d1]

Hello,

I keep getting the following bug when trying to run the unit test for Trading Strategy.

TradingStrategy_ut.py::TestMarketSimulator::test_filled_order FAILED     [ 33%]
TradingStrategy_ut.py:45 (TestMarketSimulator.test_filled_order)
self = <TradingStrategy_ut.TestMarketSimulator testMethod=test_filled_order>

    def setUp(self):
>       self.trading_strategy= TradingStrategy()
E       TypeError: __init__() missing 3 required positional arguments: 'ob_2_ts', 'ts_2_om', and 'om_2_ts'

TradingStrategy_ut.py:8: TypeError
FAILED [ 66%]
TradingStrategy_ut.py:10 (TestMarketSimulator.test_receive_top_of_book)
self = <TradingStrategy_ut.TestMarketSimulator testMethod=test_receive_top_of_book>

    def setUp(self):
>       self.trading_strategy= TradingStrategy()
E       TypeError: __init__() missing 3 required positional arguments: 'ob_2_ts', 'ts_2_om', and 'om_2_ts'

TradingStrategy_ut.py:8: TypeError
FAILED   [100%]
TradingStrategy_ut.py:29 (TestMarketSimulator.test_rejected_order)
self = <TradingStrategy_ut.TestMarketSimulator testMethod=test_rejected_order>

    def setUp(self):
>       self.trading_strategy= TradingStrategy()
E       TypeError: __init__() missing 3 required positional arguments: 'ob_2_ts', 'ts_2_om', and 'om_2_ts'

TradingStrategy_ut.py:8: TypeError