@alcorexchange/alcor-swap-sdk/test/price.test.js

## Installation ​​ **npm** ``` npm i @alcorexchange/alcor-swap-sdk ``` **yarn** ``` yarn add @alcorexchange/alcor-swap-sdk ``` ## Usage ### Import:

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const token_1 = require("entities/token");
const currencyAmount_1 = require("../src/entities/fractions/currencyAmount");
const price_1 = require("../src/entities/fractions/price");
describe("Price", () => {
    const CONTRACT_ZERO = "contracta";
    const CONTRACT_ONE = "contractb";
    const t0 = new token_1.Token(CONTRACT_ZERO, 8, "ABC");
    const t0_6 = new token_1.Token(CONTRACT_ZERO, 6, "BCD");
    const t1 = new token_1.Token(CONTRACT_ONE, 8, "EFG");
    describe("#constructor", () => {
        it("array format works", () => {
            const price = new price_1.Price(t0, t1, 1, 54321);
            expect(price.toSignificant(5)).toEqual("54321");
            expect(price.baseCurrency.equals(t0));
            expect(price.quoteCurrency.equals(t1));
        });
        it("object format works", () => {
            const price = new price_1.Price({
                baseAmount: currencyAmount_1.CurrencyAmount.fromRawAmount(t0, 1),
                quoteAmount: currencyAmount_1.CurrencyAmount.fromRawAmount(t1, 54321),
            });
            expect(price.toSignificant(5)).toEqual("54321");
            expect(price.baseCurrency.equals(t0));
            expect(price.quoteCurrency.equals(t1));
        });
    });
    describe("#quote", () => {
        it("returns correct value", () => {
            const price = new price_1.Price(t0, t1, 1, 5);
            expect(price.quote(currencyAmount_1.CurrencyAmount.fromRawAmount(t0, 10))).toEqual(currencyAmount_1.CurrencyAmount.fromRawAmount(t1, 50));
        });
    });
    describe("#toSignificant", () => {
        it("no decimals", () => {
            const p = new price_1.Price(t0, t1, 123, 456);
            expect(p.toSignificant(4)).toEqual("3.707");
        });
        it("no decimals flip ratio", () => {
            const p = new price_1.Price(t0, t1, 456, 123);
            expect(p.toSignificant(4)).toEqual("0.2697");
        });
        it("with decimal difference", () => {
            const p = new price_1.Price(t0_6, t1, 123, 456);
            expect(p.toSignificant(4)).toEqual("0.03707");
        });
        it("with decimal difference flipped", () => {
            const p = new price_1.Price(t0_6, t1, 456, 123);
            expect(p.toSignificant(4)).toEqual("0.002697");
        });
        it("with decimal difference flipped base quote flipped", () => {
            const p = new price_1.Price(t1, t0_6, 456, 123);
            expect(p.toSignificant(4)).toEqual("26.97");
        });
    });
});