Class B_Check

source code

object --+        
         |        
  Function --+    
             |    
      TestFunc --+
                 |
                B_Check

There is an attempt here to be a little efficient. Instead of having a test function for every variable and free parameter, just have one test function that monitors when one of the boundaries is crossed (self.all). Once this is triggered, find the var/par that crossed and locate using that specific var/par (self.one).