semantic-ds-toolkit/dist/test/operators/fx-cache-preload.test.js

Performance-first semantic layer for modern data stacks - Stable Column Anchors & intelligent inference

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const fx_cache_1 = require("../../src/operators/fx-cache");
describe('Operators: FXCache preload & warmup', () => {
    const realFetch = global.fetch;
    beforeEach(() => {
        jest.useRealTimers();
        const tmpFx = new fx_cache_1.FXCache(1000);
        const codes = tmpFx.getSupportedCurrencies();
        global.fetch = jest.fn(async (_url) => ({
            ok: true,
            status: 200,
            json: async () => ({
                rates: Object.fromEntries(codes.map((c) => [c, 1 + (c.charCodeAt(0) % 7) / 10]))
            })
        }));
    });
    afterEach(() => {
        global.fetch = realFetch;
    });
    it('preloadRates populates cache and produces stats', async () => {
        const fx = new fx_cache_1.FXCache(5_000, { dataSources: ['ecb'] });
        await fx.preloadRates([
            { from: 'USD', to: 'EUR' },
            { from: 'USD', to: 'GBP' },
            { from: 'EUR', to: 'USD' }
        ]);
        const stats = fx.getCacheStats();
        expect(stats.size).toBeGreaterThanOrEqual(3);
        expect(stats.oldestEntry).not.toBeNull();
        expect(stats.newestEntry).not.toBeNull();
    });
    it('warmupCache populates many entries from ECB', async () => {
        const fx = new fx_cache_1.FXCache(5_000, { dataSources: ['ecb'] });
        await fx.warmupCache('USD');
        const stats = fx.getCacheStats();
        expect(stats.size).toBeGreaterThan(20);
        expect(stats.newestEntry).toBeInstanceOf(Date);
    });
});
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