code: def test_normal_no_terms():
      """
      Tests the length of the latent variable vector for an GASReg model
      with no AR or MA terms, and tests that the values are not nan
      """
      model = pf.GASReg(formula="y ~ x1", data=data, family=pf.Cauchy())
      x = model.fit()
      assert len(model.latent_variables.z_list) == 3
      lvs = np.array([i.value for i in model.latent_variables.z_list])
      assert len(lvs[np.isnan(lvs)]) == 0
  
imports: import numpy
  import pandas
  import pyflux
label_desc: Use image node_id 1 for calling a global function with example usage: test_normal_no_terms() without return types