def test_default_construction():
"""LogicEngine is not default constructible."""
with pytest.raises(TypeError):
#pylint: disable=no-value-for-parameter
engine = LogicEngine()
def test_configuration_with_numy_facts():
facts = {"f1": "vals.sum() > blob.available"}
rules = {"r1": {"expression": "f1", "actions": ["launch"]}}
le = LogicEngine({"rules": rules, "facts": facts})
assert le.produces() == ["actions", "newfacts"]
assert set(le.consumes()) == set(["vals", "blob"])
def test_trivial_configuration():
"""Logic engine constructed with trivial rules and facts."""
cfg = {"rules": {}, "facts": {}}
le = LogicEngine(cfg)
assert le.produces() == ["actions", "newfacts"]
assert le.consumes() == []
def test_configuration_with_fact_using_function():
facts = {"f1": "len(vals) == 10"}
rules = {"r1": {"expression": "f1", "actions": ["launch"]}}
le = LogicEngine({"rules": rules, "facts": facts})
assert le.produces() == ["actions", "newfacts"]
assert le.consumes() == ["vals"]
def test_wrong_configuration():
"""LogicEngine construction requires rules and facts;
if we don't supply them it is an error."""
with pytest.raises(KeyError):
engine = LogicEngine({})