From 44b1896b9ec8af72aa0eb25e8c89a4cc0c841766 Mon Sep 17 00:00:00 2001 From: Florian Dold Date: Mon, 15 Mar 2021 13:43:53 +0100 Subject: improved pay coin selection support for multiple exchanges and healing a previous selection --- .../src/util/coinSelection-test.ts | 186 +++++++++++++++++++++ 1 file changed, 186 insertions(+) create mode 100644 packages/taler-wallet-core/src/util/coinSelection-test.ts (limited to 'packages/taler-wallet-core/src/util/coinSelection-test.ts') diff --git a/packages/taler-wallet-core/src/util/coinSelection-test.ts b/packages/taler-wallet-core/src/util/coinSelection-test.ts new file mode 100644 index 000000000..3ac718aaf --- /dev/null +++ b/packages/taler-wallet-core/src/util/coinSelection-test.ts @@ -0,0 +1,186 @@ +/* + This file is part of GNU Taler + (C) 2021 Taler Systems S.A. + + GNU Taler is free software; you can redistribute it and/or modify it under the + terms of the GNU General Public License as published by the Free Software + Foundation; either version 3, or (at your option) any later version. + + GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + A PARTICULAR PURPOSE. See the GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along with + GNU Taler; see the file COPYING. If not, see + */ + +/** + * Imports. + */ +import test from "ava"; +import { AmountJson, Amounts } from ".."; +import { AvailableCoinInfo, selectPayCoins } from "./coinSelection"; + +function a(x: string): AmountJson { + const amt = Amounts.parse(x); + if (!amt) { + throw Error("invalid amount"); + } + return amt; +} + +function fakeAci(current: string, feeDeposit: string): AvailableCoinInfo { + return { + availableAmount: a(current), + coinPub: "foobar", + denomPub: "foobar", + feeDeposit: a(feeDeposit), + exchangeBaseUrl: "https://example.com/", + }; +} + +test("coin selection 1", (t) => { + const acis: AvailableCoinInfo[] = [ + fakeAci("EUR:1.0", "EUR:0.1"), + fakeAci("EUR:1.0", "EUR:0.0"), + ]; + + const res = selectPayCoins({ + candidates: { + candidateCoins: acis, + wireFeesPerExchange: {}, + }, + contractTermsAmount: a("EUR:2.0"), + depositFeeLimit: a("EUR:0.1"), + wireFeeLimit: a("EUR:0"), + wireFeeAmortization: 1, + }); + + if (!res) { + t.fail(); + return; + } + t.true(res.coinPubs.length === 2); + t.pass(); +}); + +test("coin selection 2", (t) => { + const acis: AvailableCoinInfo[] = [ + fakeAci("EUR:1.0", "EUR:0.5"), + fakeAci("EUR:1.0", "EUR:0.0"), + // Merchant covers the fee, this one shouldn't be used + fakeAci("EUR:1.0", "EUR:0.0"), + ]; + + const res = selectPayCoins({ + candidates: { + candidateCoins: acis, + wireFeesPerExchange: {}, + }, + contractTermsAmount: a("EUR:2.0"), + depositFeeLimit: a("EUR:0.5"), + wireFeeLimit: a("EUR:0"), + wireFeeAmortization: 1, + }); + + if (!res) { + t.fail(); + return; + } + t.true(res.coinPubs.length === 2); + t.pass(); +}); + +test("coin selection 3", (t) => { + const acis: AvailableCoinInfo[] = [ + fakeAci("EUR:1.0", "EUR:0.5"), + fakeAci("EUR:1.0", "EUR:0.5"), + // this coin should be selected instead of previous one with fee + fakeAci("EUR:1.0", "EUR:0.0"), + ]; + + const res = selectPayCoins({ + candidates: { + candidateCoins: acis, + wireFeesPerExchange: {}, + }, + contractTermsAmount: a("EUR:2.0"), + depositFeeLimit: a("EUR:0.5"), + wireFeeLimit: a("EUR:0"), + wireFeeAmortization: 1, + }); + + if (!res) { + t.fail(); + return; + } + t.true(res.coinPubs.length === 2); + t.pass(); +}); + +test("coin selection 4", (t) => { + const acis: AvailableCoinInfo[] = [ + fakeAci("EUR:1.0", "EUR:0.5"), + fakeAci("EUR:1.0", "EUR:0.5"), + fakeAci("EUR:1.0", "EUR:0.5"), + ]; + + const res = selectPayCoins({ + candidates: { + candidateCoins: acis, + wireFeesPerExchange: {}, + }, + contractTermsAmount: a("EUR:2.0"), + depositFeeLimit: a("EUR:0.5"), + wireFeeLimit: a("EUR:0"), + wireFeeAmortization: 1, + }); + + if (!res) { + t.fail(); + return; + } + t.true(res.coinPubs.length === 3); + t.pass(); +}); + +test("coin selection 5", (t) => { + const acis: AvailableCoinInfo[] = [ + fakeAci("EUR:1.0", "EUR:0.5"), + fakeAci("EUR:1.0", "EUR:0.5"), + fakeAci("EUR:1.0", "EUR:0.5"), + ]; + + const res = selectPayCoins({ + candidates: { + candidateCoins: acis, + wireFeesPerExchange: {}, + }, + contractTermsAmount: a("EUR:4.0"), + depositFeeLimit: a("EUR:0.2"), + wireFeeLimit: a("EUR:0"), + wireFeeAmortization: 1, + }); + + t.true(!res); + t.pass(); +}); + +test("coin selection 6", (t) => { + const acis: AvailableCoinInfo[] = [ + fakeAci("EUR:1.0", "EUR:0.5"), + fakeAci("EUR:1.0", "EUR:0.5"), + ]; + const res = selectPayCoins({ + candidates: { + candidateCoins: acis, + wireFeesPerExchange: {}, + }, + contractTermsAmount: a("EUR:2.0"), + depositFeeLimit: a("EUR:0.2"), + wireFeeLimit: a("EUR:0"), + wireFeeAmortization: 1, + }); + t.true(!res); + t.pass(); +}); -- cgit v1.2.3