old_contents: """
  Tests to compare EEX energies to reference energies computed by amber
  """
  
  import os
  import eex
  import numpy as np
  import pandas as pd
  import pytest
  import eex_find_files
  import glob
  import eex_build_dl
  
  # Build out file list
  _test_directories = ["alkanes", "alcohols", "cyclic"]
  _test_systems = []
  
  for test_dir in _test_directories:
      print(test_dir)
      test_dir = eex_find_files.get_example_filename("amber", test_dir)
      systems = glob.glob(test_dir + "/*prmtop")
      for s in systems:
          # Grab test dir and system name
          _test_systems.append((test_dir, s.split('/')[-1]))
  
  # List current energy tests
  _energy_types = {"two-body" : "bond", "three-body": "angle"}
  
  def test_references(amber_references):
  
      test_dir, system_name = amber_references
      molecule = str(system_name.split("/")[-1]).split(".")[0]
  
      data, dl = eex_build_dl.build_dl("amber", test_dir, molecule)
      dl_energies = dl.evaluate(utype='kcal * mol ** -1')
  
      reference_file = eex_find_files.get_example_filename("amber", test_dir, "energies.csv")
      reference_energies = pd.read_csv(reference_file, header=0)
  
      reference = reference_energies.loc[reference_energies['molecule'] == molecule]
  
      for k in _energy_types:
          k_reference = reference[_energy_types[k]].get_values()[0]
  
          # Test against reference values in CSV -- absolute toloerance of 0.001 is used since amber only
          # outputs energies to third decimal place
          success = dl_energies[k] == pytest.approx(k_reference, abs=0.001)
          if not success:
              raise ValueError("AMBER Test failed, energy type %s.\n"
                               "   Test description: %s" % (k, molecule))
  
  
  # Loop over amber test directories
  @pytest.fixture(scope="module", params=_test_systems)
  def amber_references(request):
      test_dir, test_system = request.param
      return (test_dir, test_system)
  
new_contents: """
  Tests to compare EEX energies to reference energies computed by amber
  """
  
  import os
  import eex
  import numpy as np
  import pandas as pd
  import pytest
  import eex_find_files
  import glob
  import eex_build_dl
  
  # Build out file list
  _test_directories = ["alkanes", "alcohols", "cyclic"]
  _test_systems = []
  
  for test_dir in _test_directories:
      print(test_dir)
      test_dir = eex_find_files.get_example_filename("amber", test_dir)
      systems = glob.glob(test_dir + "/*.prmtop")
      for s in systems:
          path, file = os.path.split(s)
          # Grab test dir and system name
          _test_systems.append((path, file))
  
  # List current energy tests
  _energy_types = {"two-body" : "bond", "three-body": "angle"}
  
  def test_references(amber_references):
  
      test_dir, system_name = amber_references
      molecule = str(system_name.split("/")[-1]).split(".")[0]
  
      data, dl = eex_build_dl.build_dl("amber", test_dir, molecule)
      dl_energies = dl.evaluate(utype='kcal * mol ** -1')
  
      reference_file = eex_find_files.get_example_filename("amber", test_dir, "energies.csv")
      reference_energies = pd.read_csv(reference_file, header=0)
  
      reference = reference_energies.loc[reference_energies['molecule'] == molecule]
  
      for k in _energy_types:
          k_reference = reference[_energy_types[k]].get_values()[0]
  
          # Test against reference values in CSV -- absolute toloerance of 0.001 is used since amber only
          # outputs energies to third decimal place
          success = dl_energies[k] == pytest.approx(k_reference, abs=0.001)
          if not success:
              raise ValueError("AMBER Test failed, energy type %s.\n"
                               "   Test description: %s" % (k, molecule))
  
  
  # Loop over amber test directories
  @pytest.fixture(scope="module", params=_test_systems)
  def amber_references(request):
      test_dir, test_system = request.param
      return (test_dir, test_system)
  
subject: use os.path.split in amber_reference tests