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[READ-ONLY] Mirror of https://github.com/openstatusHQ/openstatus. 🫖 Status page with uptime monitoring & API monitoring as code 🫖 openstatus.dev
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1.6 kB · 45 lines
TypeScript
at incident-api
12345678910111213141516171819202122232425262728293031323334353637383940414243444546import { expect } from "@std/expect";import { describe, test } from "@std/testing/bdd";import { stub } from "@std/testing/mock";
import { shouldSample } from "./sampling";
function withRandom<T>(value: number, fn: () => T): T { const random = stub(Math, "random", () => value); try { return fn(); } finally { random.restore(); }}
describe("shouldSample", () => { test("always keeps shed and rate-limited events, even when random would drop them", () => { withRandom(0.99, () => { expect(shouldSample({ status_code: 503, shed: true })).toBe(true); expect(shouldSample({ status_code: 429, rate_limited: true })).toBe(true); // status alone is enough: the flag may be missing on a 429 from a route expect(shouldSample({ status_code: 429 })).toBe(true); expect(shouldSample({ status_code: 503 })).toBe(true); }); });
test("keeps 5xx, errors and slow requests", () => { withRandom(0.99, () => { expect(shouldSample({ status_code: 500 })).toBe(true); expect(shouldSample({ status_code: 200, error: { type: "x" } })).toBe( true, ); expect(shouldSample({ status_code: 200, duration_ms: 2001 })).toBe(true); }); });
test("samples ordinary requests at 20%", () => { const ok = { status_code: 200, duration_ms: 12 }; expect(withRandom(0.19, () => shouldSample(ok))).toBe(true); expect(withRandom(0.2, () => shouldSample(ok))).toBe(false); expect(withRandom(0.99, () => shouldSample({ status_code: 404 }))).toBe( false, ); });});