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test_lammpsdata.py
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test_lammpsdata.py
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# -*- Mode: python; tab-width: 4; indent-tabs-mode:nil; coding:utf-8 -*-
# vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4 fileencoding=utf-8
#
# MDAnalysis --- https://www.mdanalysis.org
# Copyright (c) 2006-2017 The MDAnalysis Development Team and contributors
# (see the file AUTHORS for the full list of names)
#
# Released under the GNU Public Licence, v2 or any higher version
#
# Please cite your use of MDAnalysis in published work:
#
# R. J. Gowers, M. Linke, J. Barnoud, T. J. E. Reddy, M. N. Melo, S. L. Seyler,
# D. L. Dotson, J. Domanski, S. Buchoux, I. M. Kenney, and O. Beckstein.
# MDAnalysis: A Python package for the rapid analysis of molecular dynamics
# simulations. In S. Benthall and S. Rostrup editors, Proceedings of the 15th
# Python in Science Conference, pages 102-109, Austin, TX, 2016. SciPy.
# doi: 10.25080/majora-629e541a-00e
#
# N. Michaud-Agrawal, E. J. Denning, T. B. Woolf, and O. Beckstein.
# MDAnalysis: A Toolkit for the Analysis of Molecular Dynamics Simulations.
# J. Comput. Chem. 32 (2011), 2319--2327, doi:10.1002/jcc.21787
#
import pytest
from numpy.testing import assert_equal
import numpy as np
from io import StringIO
import MDAnalysis as mda
from MDAnalysisTests.topology.base import ParserBase
from MDAnalysis.tests.datafiles import (
LAMMPSdata,
LAMMPScnt,
LAMMPScnt2,
LAMMPShyd,
LAMMPShyd2,
LAMMPSdata_deletedatoms,
LAMMPSDUMP,
LAMMPSDUMP_long,
)
class LammpsBase(ParserBase):
parser = mda.topology.LAMMPSParser.DATAParser
expected_n_segments = 1
expected_attrs = ['types', 'resids', 'masses', 'charges',
'bonds', 'angles', 'dihedrals', 'impropers']
def test_n_atom_types(self, top):
assert_equal(len(set(top.types.values)), self.expected_n_atom_types)
def test_n_bonds(self, top):
if self.ref_n_bonds:
assert_equal(len(top.bonds.values), self.ref_n_bonds)
else:
assert not hasattr(top, 'bonds')
def test_bond_member(self, top):
if self.ref_n_bonds:
assert self.ref_bond in top.bonds.values
def test_n_angles(self, top):
if self.ref_n_angles:
assert_equal(len(top.angles.values), self.ref_n_angles)
else:
assert not hasattr(self.top, 'angles')
def test_angle_member(self, top):
if self.ref_n_angles:
assert self.ref_angle in top.angles.values
def test_n_dihedrals(self, top):
if self.ref_n_dihedrals:
assert_equal(len(top.dihedrals.values), self.ref_n_dihedrals)
else:
assert not hasattr(self.top, 'dihedrals')
def test_dihedral_member(self, top):
if self.ref_n_dihedrals:
assert self.ref_dihedral in top.dihedrals.values
def test_n_impropers(self, top):
if self.ref_n_impropers:
assert_equal(len(top.impropers.values), self.ref_n_impropers)
else:
assert not hasattr(self.top, 'impropers')
def test_improper_member(self, top):
if self.ref_n_impropers:
assert self.ref_improper in top.impropers.values
def test_creates_universe(self, filename):
u = mda.Universe(filename, format='DATA')
class TestLammpsData(LammpsBase):
"""Tests the reading of lammps .data topology files.
The reading of coords and velocities is done separately in
test_coordinates
"""
ref_filename = LAMMPSdata
expected_n_atoms = 18364
expected_n_atom_types = 10
expected_n_residues = 25
ref_n_bonds = 18336
ref_bond = (12, 14)
ref_n_angles = 29904
ref_angle = (3, 6, 9)
ref_n_dihedrals = 5712
ref_dihedral = (82, 85, 88, 89)
ref_n_impropers = 0
class TestLAMMPSCNT(LammpsBase):
expected_n_atoms = 604
expected_n_atom_types = 1
expected_n_residues = 1
ref_n_bonds = 906
ref_bond = (9, 467)
ref_n_angles = 1812
ref_angle = (17, 16, 31)
ref_n_dihedrals = 3624
ref_dihedral = (22, 39, 40, 41)
ref_n_impropers = 604
ref_improper = (210, 159, 212, 566)
@pytest.fixture(params=[LAMMPScnt, LAMMPScnt2])
def filename(self, request):
return request.param
class TestLAMMPSHYD(LammpsBase):
expected_n_atoms = 2
expected_n_atom_types = 1
expected_n_residues = 1
ref_n_bonds = 1
ref_bond = (0, 1)
ref_n_angles = 0
ref_n_dihedrals = 0
ref_n_impropers = 0
@pytest.fixture(params=[LAMMPShyd, LAMMPShyd2])
def filename(self, request):
return request.param
class TestLAMMPSDeletedAtoms(LammpsBase):
ref_filename = LAMMPSdata_deletedatoms
expected_n_atoms = 10
expected_n_atom_types = 2
expected_n_residues = 1
ref_n_bonds = 9
ref_bond = (0, 3)
ref_n_angles = 0
ref_n_dihedrals = 0
ref_n_impropers = 0
def test_atom_ids(self, filename):
u = mda.Universe(filename)
assert_equal(u.atoms.ids,
[1, 10, 1002, 2003, 2004, 2005, 2006, 2007, 2008, 2009])
def test_traj(self, filename):
u = mda.Universe(filename)
assert_equal(u.atoms.positions,
np.array([[11.8998565674, 48.4455718994, 19.0971984863],
[14.5285415649, 50.6892776489, 19.9419136047],
[12.8466796875, 48.1473007202, 18.6461906433],
[11.0093536377, 48.7145767212, 18.5247917175],
[12.4033203125, 49.2582168579, 20.2825050354],
[13.0947723389, 48.8437194824, 21.0175533295],
[11.540184021, 49.6138534546, 20.8459072113],
[13.0085144043, 50.6062469482, 19.9141769409],
[12.9834518433, 51.1562423706, 18.9713554382],
[12.6588821411, 51.4160842896, 20.5548400879]],
dtype=np.float32))
LAMMPS_NORESID = """\
LAMMPS data file via write_data, version 11 Aug 2017, timestep = 0
1 atoms
1 atom types
0.0000000000000000e+00 4.3008000000000003e+01 xlo xhi
0.0000000000000000e+00 4.3008000000000003e+01 ylo yhi
0.0000000000000000e+00 4.3008000000000003e+01 zlo zhi
Masses
1 28
Pair Coeffs # lj/cut
1 0.1892 3.75
Atoms # atomic
1 1 3.7151744275286681e+01 1.8684434743140471e+01 1.9285127961842125e+01 0 0 0
"""
def test_noresid():
u = mda.Universe(StringIO(LAMMPS_NORESID), format='data',
atom_style='id type x y z')
assert len(u.atoms) == 1
assert_equal(u.atoms[0].mass, 28.0)
assert_equal(u.atoms.positions,
np.array([[3.7151744275286681e+01,
1.8684434743140471e+01,
1.9285127961842125e+01]], dtype=np.float32))
def test_noresid_failure():
with pytest.raises(
ValueError,
match='.+?You can supply a description of the atom_style.+?',
):
u = mda.Universe(StringIO(LAMMPS_NORESID), format='data')
def test_interpret_atom_style():
style = mda.topology.LAMMPSParser.DATAParser._interpret_atom_style(
'id charge type z y x')
assert isinstance(style, dict)
assert style['id'] == 0
assert style['type'] == 2
assert style['charge'] == 1
assert style['x'] == 5
assert style['y'] == 4
assert style['z'] == 3
def test_interpret_atom_style_missing():
with pytest.raises(ValueError,
match='atom_style string missing required.+?'):
style = mda.topology.LAMMPSParser.DATAParser._interpret_atom_style(
'id charge z y x')
class TestDumpParser(ParserBase):
expected_attrs = ['types', 'masses']
expected_n_atoms = 24
expected_n_residues = 1
expected_n_segments = 1
parser = mda.topology.LAMMPSParser.LammpsDumpParser
ref_filename = LAMMPSDUMP
def test_creates_universe(self):
u = mda.Universe(self.ref_filename, format='LAMMPSDUMP')
assert isinstance(u, mda.Universe)
assert len(u.atoms) == 24
def test_id_ordering(self):
# ids are nonsequential in file, but should get rearranged
u = mda.Universe(self.ref_filename, format='LAMMPSDUMP')
# the 4th in file has id==13, but should have been sorted
assert u.atoms[3].id == 4
# this tests that topology can still be constructed if non-standard or uneven
# column present.
class TestDumpParserLong(TestDumpParser):
ref_filename = LAMMPSDUMP_long