import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest' import { GoogleFinanceExchange } from '../exchanges/google_finance.js' /** * Helper to build a minimal Google Finance HTML response */ function buildGoogleFinanceHtml(from: string, to: string, rate: number): string { return `

${rate}

` } describe('GoogleFinanceExchange', () => { let exchange: GoogleFinanceExchange const originalFetch = globalThis.fetch beforeEach(() => { exchange = new GoogleFinanceExchange({ base: 'USD' }) }) afterEach(() => { globalThis.fetch = originalFetch vi.restoreAllMocks() }) it('should convert currency successfully', async () => { globalThis.fetch = vi.fn().mockResolvedValue({ ok: true, text: () => Promise.resolve(buildGoogleFinanceHtml('USD', 'EUR', 0.85)), }) const result = await exchange.convert({ amount: 100, from: 'USD', to: 'EUR', }) expect(result.success).toBe(true) expect(result.result).toBeLessThan(100) expect(result.info?.rate).toBeLessThan(1) }) it('should handle API errors gracefully', async () => { globalThis.fetch = vi.fn().mockResolvedValue({ ok: false, status: 404, statusText: 'Not Found', }) const result = await exchange.convert({ amount: 100, from: 'USD', to: 'ABC', }) expect(result.success).toBe(false) expect(result.error?.type).toBe('RATE_NOT_FOUND') }) it('should get latest rates', async () => { globalThis.fetch = vi .fn() .mockResolvedValueOnce({ ok: true, text: () => Promise.resolve(buildGoogleFinanceHtml('USD', 'EUR', 0.85)), }) .mockResolvedValueOnce({ ok: true, text: () => Promise.resolve(buildGoogleFinanceHtml('USD', 'GBP', 0.73)), }) const result = await exchange.latestRates({ base: 'USD', codes: ['EUR', 'GBP'], }) expect(result.success).toBe(true) expect(result.rates).toHaveProperty('EUR') expect(result.rates).toHaveProperty('GBP') }) it('should handle network timeouts', async () => { globalThis.fetch = vi.fn().mockRejectedValue(new Error('The operation was aborted')) const result = await exchange.latestRates({ base: 'USD', codes: ['EUR'], }) expect(result.success).toBe(false) }) it('should return same amount for same currency conversion', async () => { const result = await exchange.convert({ amount: 100, from: 'USD', to: 'USD', }) expect(result.success).toBe(true) expect(result.result).toBe(100) expect(result.info?.rate).toBe(1.0) }) })