code: def atest2_normal_predict_is_length():
      """
      Tests that the length of the predict IS dataframe is equal to no of steps h
      """
      model = pf.GASReg(
          formula="y ~ x1 + x2", data=data, family=pf.Laplace()
      )
      x = model.fit()
      assert model.predict_is(h=5).shape[0] == 5
  
imports: import numpy
  import pandas
  import pyflux
label_desc: Use image node_id 30 for calling a global function with example usage: atest2_normal_predict_is_length() without return types