public void CanLogicalOr()
{
var env = new StandardEnvironment();
Assert.AreEqual(null, env.Or(null, null));
Assert.AreEqual(null, env.Or(null, false));
Assert.AreEqual(true, env.Or(null, true));
Assert.AreEqual(null, env.Or(false, null));
Assert.AreEqual(false, env.Or(false, false));
Assert.AreEqual(true, env.Or(false, true));
Assert.AreEqual(true, env.Or(true, null));
Assert.AreEqual(true, env.Or(true, false));
Assert.AreEqual(true, env.Or(true, true));
}