public void ValidKeyShouldAuthorize()
        {
            // Arrange
            var securityDoor = new SecurityDoor { Timeout = this.timeout };
            var tracking = new MemoryTrackingParticipant();
            try
            {
                // Act
                // Insert a valid key
                securityDoor.InsertKey(Guid.NewGuid());

                // Assert
                Assert.AreEqual(DoorState.ClosedUnlocked, securityDoor.State);
            }
            finally
            {
                tracking.Trace();
                securityDoor.Trace();
            }
        }