sigma=1.,
istart=0,
lwave=False,
lcharg=False)
calc = Vasp(**settings)
atoms.set_calculator(calc)
en1 = atoms.get_potential_energy()
# Make a parameter change to the calculator
calc.set(sigma=0.5)
# Check that we capture a change for float params
assert calc.check_state(atoms) == ['float_params']
assert calc.calculation_required(atoms, ['energy', 'forces'])
en2 = atoms.get_potential_energy()
# The change in sigma should result in a small change in energy
assert (en1 - en2) > 1e-7
# Now we make a change in input_params instead
calc.kpts = 2
# Check that this requires a new calculation
assert calc.check_state(atoms) == ['input_params']
assert calc.calculation_required(atoms, ['energy', 'forces'])
# Clean up
def test_vasp2_check_state():
"""
Run tests to ensure that the VASP check_state() function call works correctly,
i.e. correctly sets the working directories and works in that directory.
This is conditional on the existence of the VASP_COMMAND or VASP_SCRIPT
environment variables
"""
from ase.test.vasp import installed2 as installed
import os
from ase import Atoms
from ase.calculators.vasp import Vasp2 as Vasp
assert installed()
# Test setup system, borrowed from vasp_co.py
d = 1.14
atoms = Atoms('CO', positions=[(0, 0, 0), (0, 0, d)], pbc=True)
atoms.extend(Atoms('CO', positions=[(0, 2, 0), (0, 2, d)]))
atoms.center(vacuum=5.)
# Test
settings = dict(xc='LDA',
prec='Low',
algo='Fast',
ismear=0,
sigma=1.,
istart=0,
lwave=False,
lcharg=False)
s1 = atoms.get_chemical_symbols()
calc = Vasp(**settings)
atoms.set_calculator(calc)
en1 = atoms.get_potential_energy()
# Test JSON dumping and restarting works
fi = 'json_test.json'
calc.write_json(filename=fi)
assert os.path.isfile(fi)
calc2 = Vasp()
calc2.read_json(fi)
assert not calc2.calculation_required(atoms, ['energy', 'forces'])
en2 = calc2.get_potential_energy()
assert abs(en1 - en2) < 1e-8
os.remove(fi) # Clean up the JSON file
# Check that the symbols remain in order (non-sorted)
s2 = calc.atoms.get_chemical_symbols()
assert s1 == s2
s3 = sorted(s2)
assert s2 != s3
# Check that get_atoms() doesn't reset results
r1 = dict(calc.results) # Force a copy
calc.get_atoms()
r2 = dict(calc.results)
assert r1 == r2
# Make a parameter change to the calculator
calc.set(sigma=0.5)
# Check that we capture a change for float params
assert calc.check_state(atoms) == ['float_params']
assert calc.calculation_required(atoms, ['energy', 'forces'])
en2 = atoms.get_potential_energy()
# The change in sigma should result in a small change in energy
assert (en1 - en2) > 1e-7
# Now we make a change in input_params instead
calc.kpts = 2
# Check that this requires a new calculation
assert calc.check_state(atoms) == ['input_params']
assert calc.calculation_required(atoms, ['energy', 'forces'])
# Clean up
calc.clean()
