269 lines
6.7 KiB
TypeScript
269 lines
6.7 KiB
TypeScript
/*
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This file is part of GNU Taler
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(C) 2021 Taler Systems S.A.
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GNU Taler is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* Imports.
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*/
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import test from "ava";
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import { AmountJson, Amounts, DenomKeyType } from "@gnu-taler/taler-util";
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import { AvailableCoinInfo, selectPayCoins } from "./coinSelection.js";
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function a(x: string): AmountJson {
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const amt = Amounts.parse(x);
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if (!amt) {
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throw Error("invalid amount");
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}
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return amt;
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}
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function fakeAci(current: string, feeDeposit: string): AvailableCoinInfo {
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return {
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availableAmount: a(current),
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coinPub: "foobar",
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denomPub: {
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cipher: DenomKeyType.Rsa,
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rsa_public_key: "foobar",
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},
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feeDeposit: a(feeDeposit),
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exchangeBaseUrl: "https://example.com/",
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};
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}
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test("it should be able to pay if merchant takes the fees", (t) => {
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const acis: AvailableCoinInfo[] = [
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fakeAci("EUR:1.0", "EUR:0.1"),
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fakeAci("EUR:1.0", "EUR:0.0"),
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];
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acis.forEach((x, i) => (x.coinPub = String(i)));
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const res = selectPayCoins({
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candidates: {
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candidateCoins: acis,
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wireFeesPerExchange: {},
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},
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contractTermsAmount: a("EUR:2.0"),
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depositFeeLimit: a("EUR:0.1"),
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wireFeeLimit: a("EUR:0"),
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wireFeeAmortization: 1,
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});
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if (!res) {
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t.fail();
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return;
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}
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t.deepEqual(res.coinPubs, ["1", "0"]);
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t.pass();
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});
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test("it should take the last two coins if it pays less fees", (t) => {
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const acis: AvailableCoinInfo[] = [
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fakeAci("EUR:1.0", "EUR:0.5"),
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fakeAci("EUR:1.0", "EUR:0.0"),
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// Merchant covers the fee, this one shouldn't be used
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fakeAci("EUR:1.0", "EUR:0.0"),
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];
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acis.forEach((x, i) => (x.coinPub = String(i)));
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const res = selectPayCoins({
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candidates: {
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candidateCoins: acis,
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wireFeesPerExchange: {},
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},
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contractTermsAmount: a("EUR:2.0"),
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depositFeeLimit: a("EUR:0.5"),
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wireFeeLimit: a("EUR:0"),
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wireFeeAmortization: 1,
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});
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if (!res) {
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t.fail();
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return;
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}
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t.deepEqual(res.coinPubs, ["1", "2"]);
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t.pass();
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});
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test("it should take the last coins if the merchant doest not take all the fee", (t) => {
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const acis: AvailableCoinInfo[] = [
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fakeAci("EUR:1.0", "EUR:0.5"),
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fakeAci("EUR:1.0", "EUR:0.5"),
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// this coin should be selected instead of previous one with fee
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fakeAci("EUR:1.0", "EUR:0.0"),
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];
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acis.forEach((x, i) => (x.coinPub = String(i)));
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const res = selectPayCoins({
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candidates: {
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candidateCoins: acis,
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wireFeesPerExchange: {},
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},
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contractTermsAmount: a("EUR:2.0"),
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depositFeeLimit: a("EUR:0.5"),
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wireFeeLimit: a("EUR:0"),
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wireFeeAmortization: 1,
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});
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if (!res) {
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t.fail();
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return;
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}
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t.deepEqual(res.coinPubs, ["2", "0"]);
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t.pass();
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});
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test("it should use 3 coins to cover fees and payment", (t) => {
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const acis: AvailableCoinInfo[] = [
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fakeAci("EUR:1.0", "EUR:0.5"), //contributed value 1 (fee by the merchant)
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fakeAci("EUR:1.0", "EUR:0.5"), //contributed value .5
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fakeAci("EUR:1.0", "EUR:0.5"), //contributed value .5
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];
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const res = selectPayCoins({
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candidates: {
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candidateCoins: acis,
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wireFeesPerExchange: {},
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},
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contractTermsAmount: a("EUR:2.0"),
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depositFeeLimit: a("EUR:0.5"),
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wireFeeLimit: a("EUR:0"),
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wireFeeAmortization: 1,
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});
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if (!res) {
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t.fail();
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return;
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}
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t.true(res.coinPubs.length === 3);
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t.pass();
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});
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test("it should return undefined if there is not enough coins", (t) => {
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const acis: AvailableCoinInfo[] = [
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fakeAci("EUR:1.0", "EUR:0.5"),
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fakeAci("EUR:1.0", "EUR:0.5"),
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fakeAci("EUR:1.0", "EUR:0.5"),
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];
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const res = selectPayCoins({
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candidates: {
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candidateCoins: acis,
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wireFeesPerExchange: {},
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},
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contractTermsAmount: a("EUR:4.0"),
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depositFeeLimit: a("EUR:0.2"),
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wireFeeLimit: a("EUR:0"),
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wireFeeAmortization: 1,
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});
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t.true(!res);
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t.pass();
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});
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test("it should return undefined if there is not enough coins (taking into account fees)", (t) => {
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const acis: AvailableCoinInfo[] = [
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fakeAci("EUR:1.0", "EUR:0.5"),
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fakeAci("EUR:1.0", "EUR:0.5"),
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];
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const res = selectPayCoins({
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candidates: {
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candidateCoins: acis,
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wireFeesPerExchange: {},
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},
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contractTermsAmount: a("EUR:2.0"),
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depositFeeLimit: a("EUR:0.2"),
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wireFeeLimit: a("EUR:0"),
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wireFeeAmortization: 1,
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});
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t.true(!res);
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t.pass();
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});
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test("it should not count into customer fee if merchant can afford it", (t) => {
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const acis: AvailableCoinInfo[] = [
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fakeAci("EUR:1.0", "EUR:0.1"),
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fakeAci("EUR:1.0", "EUR:0.1"),
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];
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const res = selectPayCoins({
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candidates: {
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candidateCoins: acis,
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wireFeesPerExchange: {},
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},
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contractTermsAmount: a("EUR:2.0"),
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depositFeeLimit: a("EUR:0.2"),
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wireFeeLimit: a("EUR:0"),
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wireFeeAmortization: 1,
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});
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t.truthy(res);
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t.true(Amounts.cmp(res!.customerDepositFees, "EUR:0.0") === 0);
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t.true(
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Amounts.cmp(Amounts.sum(res!.coinContributions).amount, "EUR:2.0") === 0,
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);
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t.pass();
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});
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test("it should use the coins that spent less relative fee", (t) => {
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const acis: AvailableCoinInfo[] = [
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fakeAci("EUR:1.0", "EUR:0.2"),
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fakeAci("EUR:0.1", "EUR:0.2"),
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fakeAci("EUR:0.05", "EUR:0.05"),
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fakeAci("EUR:0.05", "EUR:0.05"),
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];
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acis.forEach((x, i) => (x.coinPub = String(i)));
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const res = selectPayCoins({
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candidates: {
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candidateCoins: acis,
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wireFeesPerExchange: {},
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},
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contractTermsAmount: a("EUR:1.1"),
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depositFeeLimit: a("EUR:0.4"),
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wireFeeLimit: a("EUR:0"),
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wireFeeAmortization: 1,
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});
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if (!res) {
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t.fail();
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return;
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}
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t.deepEqual(res.coinPubs, ["0", "2", "3"]);
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t.pass();
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});
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test("coin selection 9", (t) => {
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const acis: AvailableCoinInfo[] = [
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fakeAci("EUR:1.0", "EUR:0.2"),
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fakeAci("EUR:0.2", "EUR:0.2"),
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];
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const res = selectPayCoins({
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candidates: {
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candidateCoins: acis,
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wireFeesPerExchange: {},
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},
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contractTermsAmount: a("EUR:1.2"),
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depositFeeLimit: a("EUR:0.4"),
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wireFeeLimit: a("EUR:0"),
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wireFeeAmortization: 1,
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});
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if (!res) {
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t.fail();
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return;
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}
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t.true(res.coinContributions.length === 2);
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t.true(
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Amounts.cmp(Amounts.sum(res.coinContributions).amount, "EUR:1.2") === 0,
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);
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t.pass();
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});
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