Thanks Paul for giving your inputs on this.

To elaborate on the need/idea that I am looking at is:

1) Let's say we have 3 graph nodes that's getting developed by 3 different 
people with clear input/output definitions at each node.
2) We want to have a unit test framework that each developer can independantly 
test their nodes before integrating. 
3) To achieve this, what I was thinking is to have one testHarness graph node ( 
may be written in python ), which can inject a vector of packets based on the 
testcase. This may use scapy as a packet crafting tool internally.
4) Once the packet is processed by the DUT graph node, the test result would 
obviously need to be cross checked against the next node index. For cross 
checking this, somehow this packet needs to be tapped again by the testHarness 
graph node ( though the next_index is set to some other functional graph node 
). Not sure, if this is achievable with VPP framework or not.

Please let me know your views on this.

Thanks & Regards,
Satish
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