Add Sign In With Ethereum unit test

[JamesSmartCell]

This new addition would make a great unit test. You can connect via WalletConnect using the modal dialog. This might need a little experimentation though - bear in mind that there's only one wallet on the test hardware, so you don't need to select wallets (I think).

[seabornlee]

Can use this test Dapp: https://react-auth-dapp.vercel.app/