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# Regina - A Normal Surface Theory Calculator
# Python Test Suite Component
#
# Copyright (c) 2007-2025, Ben Burton
# For further details contact Ben Burton (bab@debian.org).
#
# Tests casts to booleans.
#
# This file is a single component of Regina's python test suite. To run
# the python test suite, move to the main python directory in the source
# tree and run "make check".
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# As an exception, when this program is distributed through (i) the
# App Store by Apple Inc.; (ii) the Mac App Store by Apple Inc.; or
# (iii) Google Play by Google Inc., then that store may impose any
# digital rights management, device limits and/or redistribution
# restrictions that are required by its terms of service.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
if DiscType(0, 0):
print('Non-null disc type')
else:
print('Null disc type')
if DiscType():
print('Non-null disc type')
else:
print('Null disc type')
if ExampleLink.whitehead().component(0):
print('Non-null strand ref')
else:
print('Null strand ref')
if Link(1).component(0):
print('Non-null strand ref')
else:
print('Null strand ref')
g = ModelLinkGraph.fromPlantri('bcdd,aeec,abfd,acfa,bffb,ceed')
if g.node(0).adj(0):
print('Non-null graph arc')
else:
print('Null graph arc')
if ModelLinkGraphArc():
print('Non-null graph arc')
else:
print('Null graph arc')
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