CorDapp Development and Lifecycle BDC Practice Questions (Page 8)

Questions 36–38

1. 36expert · hard

   A CorDapp has a flow that collects signatures from two parties. The flow uses CollectSignaturesFlow. During testing, the flow hangs and never completes. The developer checks the logs and sees that the counterparty is waiting for a message. What is the most likely cause?

   • AThe transaction was not signed by the initiating party before calling CollectSignaturesFlow.
   • BThe flow did not call the counterparty's flow via a session, so the counterparty never received the transaction to sign.
   • CThe flow used a non-final transaction, and the counterparty is waiting for the finality step.
   • DThe contract's verify() failed on the counterparty's node, causing the flow to wait for a response that never comes.
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2. 37expert · hard

   A developer is writing a test for a flow that involves a contract with a complex verification logic. The test must verify that the contract rejects invalid transactions. What is the best testing approach?

   • AUse a flow test that runs the flow and checks that the transaction is rejected
   • BUse a MockNetwork test that runs the flow and inspects the ledger
   • CUse a unit test that directly calls the contract's verify method with invalid transactions
   • DUse a test that only checks the state's properties
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3. 38application · medium

   A developer has built a CorDapp and wants to deploy it to a Corda network. The CorDapp consists of a contracts module and a workflows module. What is the correct deployment process?

   • ACopy the source code to the nodes and compile it on each node
   • BBuild separate JARs for the contracts and workflows modules and copy both to each node's cordapps directory
   • CBuild the entire project into a single JAR and copy it to the nodes' cordapps directory
   • DBuild the workflows JAR and copy it to the nodes' cordapps directory, as it includes the contracts
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