fix(tests): update test to use stubbed turbo client

We allow a TurboAuthenticatedClient as an optional constructor param for the TurboRatesOracle. This allows us to stub the client for tests, and validate the reponse returned from the SDK is what we return from our wrapper class.

src/utils/turbo_rates_oracle.test.ts

@@ -1,32 +1,49 @@
 import chai, { expect } from 'chai';
+import sinon from 'sinon';
 import chaiAsPromised from 'chai-as-promised';
-import type { FiatID } from './fiat_oracle_types';
 import { TurboRatesOracle } from './turbo_rates_oracle';
 import { beforeEach, describe, it } from 'vitest';
+import {
+	TurboUnauthenticatedClient,
+	TurboRatesResponse
+} from '@ardrive/turbo-sdk';
 
-chai.use(chaiAsPromised);
+const turboStubbedResponse: TurboRatesResponse = {
+	winc: '10000',
+	fiat: {
+		aud: 10.123,
+		brl: 10.123,
+		cad: 10.123,
+		eur: 10.123,
+		gbp: 10.123,
+		hkd: 10.123,
+		inr: 10.123,
+		jpy: 10.123,
+		sgd: 10.123,
+		usd: 10.123
+	},
+	adjustments: []
+};
 
-const fiat: FiatID = 'usd';
-const examplePriceValue = 15.05;
+chai.use(chaiAsPromised);
 
-const TurboRatesResponseSample = `{
-	"winc": 1,
-	"fiat": {
-		"${fiat}": ${examplePriceValue}
-	}
-}`;
 describe('The TurboRatesOracle class', () => {
 	let turboRatesOracle: TurboRatesOracle;
+	let turboSpy: TurboUnauthenticatedClient;
 
 	beforeEach(() => {
-		turboRatesOracle = new TurboRatesOracle();
+		turboSpy = sinon.createStubInstance(TurboUnauthenticatedClient, {
+			getFiatRates: Promise.resolve(turboStubbedResponse)
+		});
+		turboRatesOracle = new TurboRatesOracle(turboSpy);
 	});
 
 	describe('getFiatRatesForToken function', () => {
-		it('returns the expected response after a single fetch', async () => {
-			expect(await turboRatesOracle.getTurboRates()).to.deep.equal(
-				TurboRatesResponseSample
-			);
+		it('returns the expected response from turbo', async () => {
+			const rates = await turboRatesOracle.getTurboRates();
+			expect(rates).to.deep.equal(turboStubbedResponse);
+			expect((turboSpy.getFiatRates as sinon.SinonStub).calledOnce).to.be
+				.true;
 		});
 	});
 });

src/utils/turbo_rates_oracle.ts

@@ -1,7 +1,13 @@
-import { TurboFactory, TurboRatesResponse } from '@ardrive/turbo-sdk';
+import {
+	TurboFactory,
+	TurboRatesResponse,
+	TurboUnauthenticatedClient
+} from '@ardrive/turbo-sdk';
 
 export class TurboRatesOracle implements RatesOracle {
-	private turbo = TurboFactory.unauthenticated();
+	constructor(
+		private turbo: TurboUnauthenticatedClient = TurboFactory.unauthenticated()
+	) {}
 
 	public async getTurboRates(): Promise<TurboRatesResponse> {
 		return this.turbo.getFiatRates();