public void TestEscape()
 {
     Assert.AreEqual(null, StandardFilters.Escape(null));
     Assert.AreEqual("", StandardFilters.Escape(""));
     Assert.AreEqual("&lt;strong&gt;", StandardFilters.Escape("<strong>"));
     Assert.AreEqual("&lt;strong&gt;", StandardFilters.H("<strong>"));
 }