code: def test_pow():
      array = [1, -2, 3, -4, 5, -6]
  
      s = Stream.source(array, dtype="float")
  
      s1 = s.pow(3).rename("s1")
      s2 = (s**3).rename("s2")
  
      expected = list(pd.Series(array) ** 3)
  
      assert_op([s1, s2], expected)
  
file_path: tensortrade/tests/tensortrade/unit/feed/api/float/test_operations.py
imports: import pandas
  from tensortrade.feed import Stream
  from tests.utils.ops import assert_op
label_desc: Use image node_id 11 for calling a global function with example usage: test_pow() without return types