code: def test_invalid_rmul():
      BTC = Instrument("BTC", 8, "Bitcoin")
  
      # int
      with pytest.raises(TypeError):
          q = BTC * 8
  
      # float
      with pytest.raises(TypeError):
          q = BTC * 8.0
  
file_path: tensortrade/tests/tensortrade/unit/oms/instruments/test_instrument.py
imports: import pytest
  from tensortrade.oms.instruments import Instrument, Quantity
  from tensortrade.core.exceptions import InvalidTradingPair
label_desc: Use image node_id 5 for calling a global function with example usage: test_invalid_rmul() without return types