def test_check_when_not_satisfiable_returns_unsatisfied():
a = Bool("a")
lit = Literal(a, negated=False)
clause = Clause([lit])
model = {a: False}
value = clause.check(model)
assert value == SatisfyStatus.Unsatisfied
def test_check_when_unit_returns_unit():
a = Bool("a")
b = Bool("b")
lit_a = Literal(a, negated=False)
lit_b = Literal(b, negated=False)
clause = Clause([lit_a, lit_b])
model = {a: False}
value = clause.check(model)
assert value == SatisfyStatus.Unit
def test_check_when_not_fully_defined_returns_pending():
a = Bool("a")
b = Bool("b")
c = Bool("c")
lit_a = Literal(a, negated=False)
lit_b = Literal(b, negated=False)
lit_c = Literal(c, negated=False)
clause = Clause([lit_a, lit_b, lit_c])
model = {a: False}
value = clause.check(model)
assert value == SatisfyStatus.Pending