code: def test_subsequence_at_start(self):
      x = pd.Series(
          [
              -1.38,
              0.15,
              -1.16,
              0.6,
              0.18,
              1.11,
              -0.19,
              0.25,
              -1.41,
              0.54,
              0.29,
              -1.59,
              1.67,
              1.19,
              0.44,
              2.39,
              1.54,
              -0.34,
              -1.41,
              0.58,
          ],
      )
      longest_sequence = [-1.38, 0.15, -1.16]
      primitive_instance = self.primitive()
      primitive_func = primitive_instance.get_function()
      assert primitive_func(x) == len(longest_sequence)
  
file_path: featuretools/featuretools/tests/primitive_tests/aggregation_primitive_tests/test_num_consecutive.py
imports: import numpy
  import pandas
  from featuretools.primitives import NumConsecutiveGreaterMean, NumConsecutiveLessMean
label_desc: Use image node_id 3 for calling the TestNumConsecutiveLessMean obj's underlying member method code with example usage: obj.test_subsequence_at_start() without return types