def METHOD_NAME(mock_account, mock_keystore):
    mock_keystore_path = mock_keystore / MOCK_KEYFILE_NAME
    mock_keystore_uri = f'keystore:{mock_keystore_path}'
    # Return a "real" account address from the keyfile
    signer = Signer.from_signer_uri(uri=mock_keystore_uri, testnet=True)  # type: KeystoreSigner
    assert signer.path == mock_keystore_path
    assert len(signer.accounts) == 1
    assert mock_account.address in signer.accounts