Write a simple test like so

• ROOT (which is B) performs successive CALL's to contracts
  • A with value 1
  • B with value 2 (selfcall)
  • A with value 3
  • C with value 4
  • B with value 5 (selfcall)
  • A with value 6
• finish with a REVERT (optionally)

The next level of testing would have A be callable either with a simple transfer function or with a tipTheSender function where A performs a CALL to its caller address and gives back half the money it got i.e. half of the CALLVALUE.

Also the ROOT should have the option to use a sendAll method where it sends its entire balance. The target should be allowed to be any of the above.

Furthermore we want the choice between using normal CALL's and CALLCODE's.

Also, run the same test not from ROOT but from one level above ROOT twice in a row (in the same transaction, covering all 4 possibilities of reverting, e.g., first reverting and second not).