public void AssertTemperatureAgeRunRetractAgeRunHasNoFever()
{
this.world.AssertFact(new IsFact("Temperature", 38));
this.world.AssertFact(new IsFact("Age", 30));
this.world.Run();
Assert.IsTrue(this.HasFever());
this.world.RetractFact(new IsFact("Temperature", 38));
this.world.Run();
Assert.IsFalse(this.HasFever());
}