Proxy auth required event.
Наследование: ExceptionEvent
 public void ReturnsStringOnToString()
 {
     var exception = new Mock<CmisRuntimeException>();
     string message = "AuthRequiredException";
     exception.Setup(e => e.ToString()).Returns(message);
     exception.Setup(e => e.Message).Returns(message);
     var ev = new ProxyAuthRequiredEvent(exception.Object);
     string s = ev.ToString();
     Assert.IsNotNullOrEmpty(s);
 }