code: def test_r_glm():
      dataset = sm.datasets.get_rdataset("cars").data
      genotype_df = dataset.loc[:, ["speed"]]
      phenotype_df = dataset.loc[:, ["dist"]]
      covariate_df = pd.DataFrame({})
      assert_glow_equals_golden(genotype_df, phenotype_df, covariate_df)
  
imports: import functions
  import numpy
  import statsmodels.api
  import pandas
  import glow.gwas.functions
  import glow.gwas.lin_reg
  import pytest
label_desc: Use image node_id 9 for calling a global function with example usage: test_r_glm() without return types