Added test case fot the defect MAGN-3784

Added a test case to catch regression.
One more verification pending from Revit side, I need to find out a way to verify there is only one point in Revit.
But for now at least it is checking whether Reference Point updating with its input value change.

BugID: http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-3784 

<h4>Reviewer</h4>
@ikeough @lukechurch