def test_resolve_symbol(self):
resolvent = resolve_symbol(cnf.c('!b || !c'), cnf.c('b || d'), 'b')
assert resolvent == cnf.c('d || !c')
resolvent = resolve_symbol(cnf.c('!b || !c || e'), cnf.c('b || d'),
'b')
assert resolvent == cnf.c('d || !c || e')
resolvent = resolve_symbol(cnf.c('!b || !c'), cnf.c('b || d'), 'c')
assert resolvent == None
resolvent = resolve_symbol(cnf.c('!b || !c'),
cnf.c('b || c || e || d'), 'b')
assert resolvent == None
resolvent = resolve_symbol(cnf.c('!b || !c'),
cnf.c('b || !c || e || d'), 'b')
assert resolvent == cnf.c('d || !c || e')
def test_resolve_symbol4(self):
resolvent = resolve_symbol(cnf.c('b || !c'), cnf.c('b || d'), 'b')
assert resolvent == None
def test_resolve_symbol2(self):
resolvent = resolve_symbol(cnf.c('!b || !c || e'), cnf.c('b || d'),
'b')
assert resolvent == cnf.c('d || !c || e')