CBSE - Certified Blockchain Security Expert Blockchain System Testing Questions and Answers

Question 1

A quality assurance team is testing a decentralized finance (DeFi) protocol where a lending smart contract must interact with a separate staking contract to determine correct interest rates. Which type of testing is MOST critical for verifying that a user staking tokens in the second contract correctly updates the available borrowing rates in the first contract?

Accepted Answer

Integration Testing

Answer

Integration testing is designed to verify the interaction and data flow between different, separate software components. In this scenario, the critical function to test is the communication and state dependency between the lending and staking contracts, which is the primary focus of integration testing.

Question 2

A development team wants to ensure their new decentralized exchange (DEX) can handle an anticipated launch-day load of 1,000 transactions per second (TPS) without significant delays. Which type of system testing should be prioritized to validate this specific non-functional requirement?

Accepted Answer

Performance Testing

Answer

Performance testing is used to evaluate how a system behaves under a specific workload, measuring key indicators like transaction throughput (TPS), latency, and stability. This is the correct method to determine if the DEX can meet the 1,000 TPS requirement.

Question 3

A team is in the final stages of testing their dApp. They require an environment that closely mimics the public mainnet, including unpredictable block times and potential network congestion, to conduct a final public test run without using real assets. Which environment best suits this need?

Accepted Answer

A public testnet like Sepolia

Answer

Public testnets (like Sepolia for Ethereum) are designed to simulate the real mainnet environment as closely as possible. They are publicly accessible and use valueless test tokens, allowing developers and users to experience real-world network conditions (e.g., latency, congestion) before a mainnet deployment.

Question 4

What is the primary objective of applying fuzz testing to a smart contract's functions?

Accepted Answer

To automatically discover security vulnerabilities by providing unexpected or random data to function inputs.

Answer

Fuzz testing, or fuzzing, is an automated testing technique that involves feeding a program invalid, unexpected, or random data to its inputs. The primary goal is to trigger unexpected states or errors, thereby discovering security vulnerabilities like integer overflows, unhandled exceptions, or denial-of-service possibilities that might be missed by standard testing.

Question 5

When testing a blockchain application, which of the following presents a unique and fundamental challenge not typically encountered when testing traditional, centralized web applications?

Accepted Answer

The immutability of deployed on-chain code and the difficulty of patching bugs.

Answer

The immutability of the blockchain is a core principle that makes it fundamentally different from traditional systems. Once a smart contract is deployed, its code cannot be easily altered. This makes fixing bugs post-deployment exceptionally difficult and expensive, placing immense importance on thorough pre-deployment testing. Traditional applications, by contrast, can be patched and redeployed with relative ease.

(CBSE) Certified Blockchain Security Expert Practice Test

(CBSE) Certified Blockchain Security Expert Practice Test

CBSE - Certified Blockchain Security Expert Blockchain System Testing Questions and Answers