import {Suite, expect} from "cynic"

import {exchangeRates} from "./testing-tools.js"
import {convertCurrency} from "./convert-currency.js"

export default <Suite>{
	"convert values": async() => {
		expect(convertCurrency({
			value: 100,
			inputCurrency: "GBP",
			outputCurrency: "USD",
			exchangeRates,
		})).equals(200)
		expect(convertCurrency({
			value: 200,
			inputCurrency: "USD",
			outputCurrency: "GBP",
			exchangeRates,
		})).equals(100)
		expect(convertCurrency({
			value: 60,
			inputCurrency: "CAD",
			outputCurrency: "USD",
			exchangeRates,
		})).equals(40)
	},
	"survives same input/output currencies": async() => {
		expect(convertCurrency({
			value: 123,
			inputCurrency: "CAD",
			outputCurrency: "CAD",
			exchangeRates,
		})).equals(123)
	},
	"throws on invalid currency": async() => {
		expect(() => convertCurrency({
			value: 100,
			inputCurrency: "xyz",
			outputCurrency: "USD",
			exchangeRates,
		})).throws()
		expect(() => convertCurrency({
			value: 100,
			inputCurrency: null,
			outputCurrency: "USD",
			exchangeRates,
		})).throws()
		expect(() => convertCurrency({
			value: 100,
			inputCurrency: "",
			outputCurrency: "USD",
			exchangeRates,
		})).throws()
		expect(() => convertCurrency({
			value: 100,
			inputCurrency: "GBP",
			outputCurrency: "xyz",
			exchangeRates,
		})).throws()
	},
}