punnkam / solidity_takehome

Element Takehome Solidity Test

This trial project is designed to test basic and intermediate solidity knowledge. In this folder we have pre-initialized a development and testing environment called hardhat and created an example test. Please fork this repo, download a local copy, and develop a set of solutions to the problems. Please do not make your forked repo or solutions public. We look forward to learning more about your skills!

Tasks

The following tasks test solidity fluency and fluency with the solidity testing. They do not need to be completed in order and it is possible to be a successful candidate without completing all of them, please address them in whatever way you think demonstrates your best work.

Beginner Tasks

The following are designed to be solvable by all candidates.

1. We have created a basic ERC20 contract (contracts/ERC20.sol) and a partially complete test file for it (tests/ERC20.ts) which currently only tests the transfer functionality. Please add more tests to this file to increase the coverage level. Some examples of functions which may need more testing are transferFrom and approve.
2. Please create a grant funding contract which allows the account which deployed it to:
   1. Create new grants which transfer a variable amount of ERC20 tokens into the contract and store the amount and recipient with an unlock timestamp.
   2. Allows the funder to remove a grant before it unlocks for collection by the recipient.
   3. Allows the recipient to claim a grant after the unlock timestamp and transfer the funds out of the contract.
3. Please create a testing file and test the smart contract you wrote.
   • Hint - we have added a convenience method increaseBlockTimestamp which fast forwards the block timestamp for the locally deployed test ethereum network.

Intermediate tasks

The following are intermediate tasks and are optional for candidates for Junior roles.

1. Please review ‘contracts/Market.sol’ for security vulnerabilities and write a small amount of text explaining any you find.
2. Please design a new feature or set of features for the grant contract which extend on the functionality of the contract. This is intentionally open ended, creative and ux improving features will be highly appreciated.

Build and Testing

Please note that we want to see your coding ability, and not your ability to solve weird deployment installation or environment configuration problems for this reason if you encounter any problems unrelated to your code please reach out to your point of contact for support.

1. Getting Started (Prerequisites)

• Install npm

2. Setup

git clone https://github.com/element-fi/solidity_takehome.git

cd solidity_takehome
npm install

3. Build

npm run build

4. Test

npm run test