public void AddTrailingForwardSlashTest()
{
String s = null;
Assert.Throws <ArgumentNullException>(() => s.AddTrailingForwardSlash());
s = "";
Assert.AreEqual("/", s.AddTrailingForwardSlash());
s = "a";
Assert.AreEqual("a/", s.AddTrailingForwardSlash());
s = "a/";
Assert.AreEqual("a/", s.AddTrailingForwardSlash());
s = "a//";
Assert.AreEqual("a//", s.AddTrailingForwardSlash());
s = "a/ ";
Assert.AreEqual("a/ /", s.AddTrailingForwardSlash());
}