How to wrap ETH to WETH on testnet
Look for the corresponding contract in this article:
https://blog.0xproject.com/canonical-weth-a9aa7d0279dd?gi=ad5edae916c4
For Rinkeby its: https://rinkeby.etherscan.io/address/0xc778417e063141139fce010982780140aa0cd5ab
Go to the Contract > Write Contract and to connect your wallet, click on "Connect on Web3"
Go to function "5. deposit" and write the amount of ETH you would like to wrap to WETH, Click "Write" and wait until your tx is mined
