// Get the standard ethers contract
const token = await ethers.Contract(address, abi, signer);

const account = Account.create(token, "password123");
await account.loginWithEthersSigner(signer);

expect(account.isLoggedIn()).toBe(true);

// Generate proof that shields 1 token
// Call the deposit method on the contract which will
// call `transferFrom` to spend 1 of your ERC-20 tokens and
// commit the transaction. If the transfer fails the transaction will fail
const shieldProof = await account.proveShield(1e18);
await token.deposit(shieldProof);

// Generate proof that sends 0.5 tokens to toAddress
const transferProof = await account.proveTransfer(5e17, receiver);

// Call the transfer method on the contract which will
// verify and commit the transaction
await token.transfer(transferProof);

// Generate proof that burns 0.5 tokens to the receiver address
const unshieldProof = await account.proveUnshield(5e17, receiver);

// Call the withdraw method on the contract which will
// call `transferFrom` to return 0.5 of your ERC-20 tokens to your public account
await token.withdraw(unshieldProof);