code: def test_jensens_alpha(self):
      bench_return = self.pctret.sample(
          n=self.close.shape[0], random_state=1
      )
      result = pandas_ta.jensens_alpha(self.close, bench_return)
      self.assertIsInstance(result, float)
      self.assertGreaterEqual(result, 0)
  
imports: from unittest import skip, TestCase
  from pandas import DataFrame
  from .config import sample_data
  from .context import pandas_ta
label_desc: Use image node_id 9 for calling the TestUtilityMetrics obj's underlying member method code with example usage: obj.test_jensens_alpha() without return types