public void CanIsFalse()
{
var env = new StandardEnvironment();
// null and false are "falsy", all other values are "truthy"
// Generally, IsFalse(x) != IsTrue(x) for all x except null.
Assert.IsFalse(env.IsFalse(null));
Assert.IsTrue(env.IsFalse(false));
Assert.IsFalse(env.IsFalse(true));
Assert.IsFalse(env.IsFalse(0.0));
Assert.IsFalse(env.IsFalse(-2.5));
Assert.IsFalse(env.IsFalse(string.Empty));
Assert.IsFalse(env.IsFalse("foo"));
}