public void RuleNotFire()
{
Rule rule = new Rule(new Fact[] {
new IsFact("Temperature", 40),
new IsFact("Age", 50)
}, null);
World world = new World();
world.AssertFact(new IsFact("Age", 60));
world.AssertFact(new IsFact("Temperature", 40));
Assert.IsFalse(rule.FireIfReady(world));
}