vodQA Pune (2019) - Testing ethereum smart contracts
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This document discusses testing Ethereum smart contracts. It provides an overview of Ethereum as a distributed public network running the Ethereum Virtual Machine. It describes how to set up a testing environment using Geth and Truffle, including developing smart contracts, running unit and integration tests. It also discusses non-functional testing like node, performance, and security testing.
vodQA Pune (2019) - Testing ethereum smart contracts
- 1. GLOBAL SOFTWARE CONSULTANCY TESTING ETHEREUM SMART CONTRACTS By Preet G S Anand and Himanshu Pandey 1©ThoughtWorks 2019 Commercial in Confidence VodQA Pune 2019
- 2. 2©ThoughtWorks 2019 Commercial in Confidence AGENDA BRIEF OVERVIEW OF ETHEREUM DAPP ARCHITECTURE AND TESTING COMPONENTS TESTING IN BLOCKCHAIN PARADIGM
- 3. BRIEF OVERVIEW OF ETHEREUM 3©ThoughtWorks 2019 Commercial in Confidence Decentralized platform that runs smart contracts
- 4. 4©ThoughtWorks 2019 Commercial in Confidence WHAT IS DLT? ● Distributed Ledger Technology ● Distribute the ledger across all nodes ● Every node has complete copy of the ledger, and all ledgers are always in sync
- 5. 5©ThoughtWorks 2019 Commercial in Confidence WHAT IS ETHEREUM ? DISTRIBUTED PUBLIC NETWORK CONSENSUS ETHEREUM VIRTUAL MACHINE
- 6. 6©ThoughtWorks 2019 Commercial in Confidence DISTRIBUTED PUBLIC NETWORK ● Ethereum is a peer to peer network, somewhat like a mesh topology ● Any new node can be added to this network ● Any machine which is part of ethereum network is a node ● There are three types of ethereum nodes: ○ Full node ○ Lightweight node ○ Miner node
- 7. 7©ThoughtWorks 2019 Commercial in Confidence CONSENSUS ● Achieve agreement on a single data value in blockchain ● Involves reward for nodes which participate in consensus resolution ● Types : ○ Proof of Work (POW) ○ Proof of Stake (POS) ○ Proof of Authority (POA)
- 8. 8©ThoughtWorks 2019 Commercial in Confidence ETHEREUM VIRTUAL MACHINE ● Ethereum is a programmable blockchain ● EVM is “Turing Complete” ● EVM is something which differentiates Ethereum with Blockchain ● Each and every node of the network runs the EVM and executes the same instructions
- 9. DAPP ARCHITECTURE AND TESTING COMPONENTS 9©ThoughtWorks 2019 Commercial in Confidence
- 10. DAPP ARCHITECTURE 10 HTML / JS / CSS Block EVM BLOCKCHAIN FRONT END BROWSER ©ThoughtWorks 2019 Commercial in Confidence API DB WEB3 API RPC Smart Contracts
- 11. HOW IS IT DIFFERENT FROM A WEB APP 11 PARTY A PARTY B PARTY C ©ThoughtWorks 2019 Commercial in Confidence
- 12. Different parts of Web3 API ● Node / Java / Python API ○ Uses Web3 library ○ Talks to blockchain via RPC calls ○ Provides wrappers over smart contracts ● Smart Contracts ● Database HOW DOES THE API LAYER LOOK LIKE 12©ThoughtWorks 2019 Commercial in Confidence API DB Smart Contracts
- 13. WHAT IS A SMART CONTRACT ● Smart contracts is a misnomer. ● They : ○ Store rules ○ Verifies rules ○ Self execute rules ● Removes need of a middle man as they are self executing, ex: Vending machines ● Help in exchanging money, property, goods in a transparent, direct and trusted way. ● They are responsible for creating blocks in blockchain. 13©ThoughtWorks 2019 Commercial in Confidence
- 14. SETTING UP A TEST ENVIRONMENT 14©ThoughtWorks 2019 Commercial in Confidence
- 15. ● In order to communicate with the blockchain, we must use a blockchain client ● Geth is an ethereum client and is written in Go ● Enable you to connect with blockchain over RPC endpoint ● Provides API for account management,transaction management, peer management, debugging 15©ThoughtWorks 2019 Commercial in Confidence GETH
- 16. 16©ThoughtWorks 2019 Commercial in Confidence ● Development environment ● Testing framework ● Asset pipeline for blockchains using the Ethereum Virtual Machine TRUFFLE
- 17. ● Install truffle npm i -g truffle ● Initialise project truffle init TRUFFLE SETUP 17©ThoughtWorks 2019 Commercial in Confidence
- 18. TESTING IN BLOCKCHAIN PARADIGM 18©ThoughtWorks 2019 Commercial in Confidence
- 19. UNIT TESTS 19©ThoughtWorks 2019 Commercial in Confidence ● Written in solidity (.sol) files ● Direct access to your deployed contracts ● Ability to import any contract dependency
- 20. INTEGRATION TESTS 20©ThoughtWorks 2019 Commercial in Confidence ● Written in javascript (.js) files ● Uses the Mocha testing framework and Chai for assertions
- 21. NON FUNCTIONAL TESTING 21©ThoughtWorks 2019 Commercial in Confidence
- 22. NODE TESTING ● Network Handshaking ● Consensus Handshaking ● Chain Syncing ● Tools : eth-tester ©ThoughtWorks 2019 Commercial in Confidence
- 23. PERFORMANCE TESTING ● Network Latency ● Transaction Per Second (TPS) ● Block/Transaction Size ● Gas used per transaction ©ThoughtWorks 2019 Commercial in Confidence
- 24. SECURITY TESTING 24 ● Access and Authentication ● Network Permissioning ● Wallet Signature Method ● Private Keys ● Smart Contract Owner Verification ● Tools : a. Solium b. Solhint c. openzeppelin-solidity ©ThoughtWorks 2019 Commercial in Confidence
- 25. THANKYOU 25 Preet G S Anand APPLICATION DEVELOPER preetgsa@thoughtworks.com | thoughtworks.com ©ThoughtWorks 2019 Commercial in Confidence HIMANSHU PANDEY APPLICATION DEVELOPER phiman@thoughtworks.com | thoughtworks.com
Editor's Notes
- #6: . Most popular implementation of DLT . Unlike bitcoin, which is only used to transfer coins, we can have a complete application deployed in ethereum . Ethereum is on a public network . Biggest differance is that data and code won’t be restricted to one party