Smart Contract Development and Unit Testing

Monika Raisinghani
5 min readMar 3, 2022


Smart contract development isn’t going to be that much smart if the unit testing is not done right. As the smart contract is something related to transactions there is no scope of having loose ends in it. With continual and diligent unit testing, smart contracts can be free from bugs, security loopholes, and other vulnerabilities.

Through this post, we’re trying to bring the importance of unit testing to the surface and the processes that can make this happen.

General Philosophy of Smart Contract Security Mindset

Cryptocurrency and blockchain technologies are complex, inventive, and have huge scope for experiment and evolvement. Even if new security developments are happening every day, one must not overlook the fact that there is always some scope for new bugs and hassles to show up.

Smart contract programming is a step towards improved security of blockchain and cryptocurrencies like Ethereum. Those who are involved in the task must own an engineering bend of mind. Additionally, one should get familiar with higher failure rates, difficulties in changing the course of action, and the fact that it’s way more than customary web/mobile app development.

Development Recommendations

Effective smart contract development tends to follow a certain path and strategy to achieve impeccable results. Below-mentioned is the six categories of development recommendation for Ethereum smart contracts.

  • The general category explains the basic guidelines and development principles, placed at the core of smart contract development.
  • The precautions category talks about the principles required to keep the vulnerabilities at bay and ways to keep the damage under control.
  • Solidity-specific categories educate developers about the expert tips useful for smart contracts development in solidity.
  • Token-specific category brings the key recommendation to use while handling token implementations.
  • The documentation category features the guidelines to be followed during the smart contract and their surrounding ecosystem processes’ documentation.
  • Deprecated is the last development category that talks about the past vulnerabilities that are no longer relevant.

Security Tools List for Improving Code Quality and Detecting Vulnerabilities

The foundation of unit testing for the smart contract is code quality and early vulnerability detection. Once these two steps are handled correctly, the further unit testing journey isn’t going to be that taxing. Gladly, there are a couple of automated and high-end tools ready to assist greatly in the job. Let’s have a look at them.

Waffle: It’s an ether.js.-based framework for advanced smart contract development and testing. More than 25,000 projects have already been tested with this inventive tool. Qualities like an easy learning curve, simple syntax, and quick contract compilations have made it everyone’s first choice for hassle-free smart contract testing.

Solidity-Coverage: A much-talked-about tool on GitHub, Solidity coverage is used to test code coverage for smart contracts. MIT holds the license of this tool, which means it’s trustworthy and highly feature-rich.

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hevm: Using this tool makes EVM implementation is easier than ever. EVM testing is crucial for smart contract testing and debugging.

Whiteblock Genesis: Dedicated to providing end-to-end testing for blockchain, Whiteblock Genesis assists greatly in the sandbox in an easy manner.

OpenZeppelin Test Environment: Get this tool for blazing-fast smart contract testing. As it features a one-line setup, getting started with it isn’t a tough task. There are no global variables, no hacks, and no gas limit with this tool

OpenZeppelin Test Helpers: This tool is basically an assertion library used commonly in smart contract testing done for Ethereum. It bears the responsibility of ensuring the appropriate behavior of the contracts.

Bug Bounties List

Below mentioned are the key bug bounty programs that aid greatly in the smart contract development, their security, and extend the scope.

  • AirSwap: AirSwap is a decentralized exchange contract helping greatly in the atomic swaps of ERC20 tokens. The exchange happens only on two Ethereum. It considers the ‘on-chain’ part of the protocol along with the ‘off-chain’ work happened between peers.
  • Ethereum Foundation: Dedicated to Ethereum bug bounty, this platform offers huge bug bounty scope for clients, Solidity, Vyper, and other resources.
  • Gitcoin Bounties is a great way to have a hold over bounty-based collaboration tools and learned about their usages.
  • Parity will provide immediate access to clients and contract codes.

Smart Contract Unit Testing — Key Considerations

Now that a lot is learned about smart contract development, bounty programs, and many more related stuff, it’s time to move forward to unit testing.

To begin with unit testing for smart contracts, we need tokens. You can either write them or automatically create them via OpenZeppelin. With the help of the platform, you can create an ERC20 token instantly.

As most developers think thatOZ implementation of ERC20 will lead to perfect code generation, it doesn’t mean code testing isn’t required.

Once the token is ready, begin with the testing suite set-up. You can import the regenerator from the regenerator-runtime package. After that, copy the code mentioned in README, deploy the accurate creation in the create parameter, set up a mint parameter as per the token’s nature, and finally set up the supply and initial balance for the token.

After a successful testing suite set-up, the next step is to call the truffle test command. During this step, it’s natural to see multiple test cases linked with early supply, balances, minting, transfers, and balances. But, that’s a good thing as it refers to full token coverage.

While you continue unit tests for smart contracts, you’re likely to face the shortcoming linked with the tools. So, keep ready to deal with them in advance.

Take a Step towards Secured Smart Contract Development

Smart contracts are key components for blockchain and Ethereum development. Having loopholes in them can lead to endless hassles. With carefully planned unit testing and using inventive tools, developers can develop flawless unit tests, identify the bugs in the early stage, and fix them. If all that sounds too overwhelming for you, hire professionals for the job. But, don’t skip unit testing for smart contracts.

Originally published at on March 3, 2022.