List wallets

@Test 
public void listWallets() {
    Wallet bankWallet = Wallet.create(randomUUID(), "bank");
    Wallet ccWallet = Wallet.create(randomUUID(), "credit card");
    db.execSQL(storeWalletSql(bankWallet));
    db.execSQL(storeWalletSql(ccWallet));

    assertThat(storage.list()).containsExactly(bankWallet, ccWallet);
}

private String storeWalletSql(Wallet wallet) {
    return String.format("INSERT INTO tbl_wallet VALUES ('%s', '%s');", wallet.uuid().toString(), wallet.name());
}