def METHOD_NAME(self):
    self.potential1.train(
        train_structures=self.test_structures,
        train_energies=self.test_energies,
        train_forces=self.test_forces,
        train_stresses=self.test_stresses,
    )
    energy, forces, stress = self.potential1.predict_efs(self.test_struct)
    assert len(forces) == len(self.test_struct)
    assert len(stress) == 6
    self.potential2.train(
        train_structures=self.test_structures,
        train_energies=self.test_energies,
        train_forces=self.test_forces,
        train_stresses=self.test_stresses,
    )
    energy, forces, stress = self.potential2.predict_efs(self.test_struct)
    assert len(forces) == len(self.test_struct)
    assert len(stress) == 6