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"""Test gmxapi functionality described in roadmap.rst."""

import pytest

import gmxapi as gmx
from gmxapi.version import has_feature

@pytest.mark.skipif(not has_feature('fr11'),
                   reason="Feature level not met.")
def test_fr11():
    """FR11: Python access to TPR file contents.

    * gmx.read_tpr utility provides access to TPR file contents
    * gmx.read_tpr operation produces output consumable by gmx.mdrun
    * gmx.mdrun produces gromacs.read_tpr node for tpr filename kwargs
    """
    simulation_input = gmx.read_tpr(initial_tpr)
    nsteps = simulation_input.params('nsteps')
    md = gmx.mdrun(simulation_input)
    assert md.output.trajectory.step.result() == nsteps
