code: def test_protein():
      r = PandasPdb.rmsd(
          p1t48.df["ATOM"], p1t49.df["ATOM"], s="c-alpha", invert=False
      )
      assert r == 0.4785, r
  
file_path: biopandas/biopandas/pdb/tests/test_rmsd.py
imports: from biopandas.pdb import PandasPdb
  import os
  from nose.tools import raises
label_desc: Use image node_id 5 for calling a global function with example usage: test_protein() without return types