def test_KnowledgeEngine_reset_resets_facts():
from pyknow.engine import KnowledgeEngine
ke = KnowledgeEngine()
ke._facts = None
ke.reset()
assert ke._facts is not None
def test_KnowledgeEngine_retract_retracts_fact():
from pyknow.engine import KnowledgeEngine
from unittest.mock import patch
ke = KnowledgeEngine()
with patch('pyknow.factlist.FactList') as mock:
ke._facts = mock
ke.retract(0)
assert mock.retract.called
def test_KnowledgeEngine_declare_define_fact():
from pyknow.engine import KnowledgeEngine
from pyknow.fact import Fact
from unittest.mock import patch
ke = KnowledgeEngine()
with patch('pyknow.factlist.FactList') as mock:
ke._facts = mock
ke.declare(Fact())
assert mock.declare.called
