Project #3: ERC20+ETH Wrapper
ERC20 Wrapper
Users can exchange ERC20 TokenA for ERC20 TokenB via a contract called Wrapper. Wrapper contract will do a 1 for 1 exchange. (Similar to WETH contract)
Objectives
Users can send a pre-specified ERC20 token to a Wrapper contract (also an ERC20).
Wrapper contract issues an equal number of Wrapper tokens to the sender.
Holder of wrapper tokens can claim their original ERC20 tokens, by burning wrapped tokens.
The functions used will be similar to those in the Vault, but you will notice that now we use tokens as a system of record.
Contracts
Create a mock token (inherit ERC20.sol)
ERC20Wrapper.sol
ERC20Wrapper.sol will store mock tokens and issue out wrapper tokens for the same amount.
Testing
Focus will be on the ERC20Wrapper contract.
Testing states:
Stretch Goals
Ether is not an ERC-20 token. Code a Wrapper that takes Ether as it's currency.
Contract
ETHWrapper.sol
Testing
StateZeroTest: (user has 1 ETH)
Test if user can send ether, and receive the corresponding amount of wrapped tokens. (testReceive)
StateUserWithWrappedETHTest: (user has 0.5 ETH, 0.5 WETH)
Test if user can receive their ETH back, by calling unwrap (testUnwrap)
Deployment
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