78 lines
2.0 KiB
TypeScript
78 lines
2.0 KiB
TypeScript
import { describe, expect, it } from "vitest";
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import {
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evaluateBundleBudget,
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evaluateFieldBudget,
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evaluateLabBudget,
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percentile75,
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} from "../../src/application/policies/performance-budgets.ts";
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describe("performance budgets", () => {
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it("rejects initial and lazy JavaScript above their named limits", () => {
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const thresholds = {
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initialJsGzipBytes: 200,
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lazyChunkGzipBytes: 120,
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};
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expect(
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evaluateBundleBudget(
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{ initialJsGzipBytes: 201, lazyChunks: [] },
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thresholds,
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).passed,
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).toBe(false);
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expect(
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evaluateBundleBudget(
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{
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initialJsGzipBytes: 100,
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lazyChunks: [{ path: "lazy.js", gzipBytes: 121 }],
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},
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thresholds,
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).passed,
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).toBe(false);
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});
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it("fails lab evidence when context is absent or a metric is over budget", () => {
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const thresholds = { lcpMs: 2500, cls: 0.1, namedInteractionMs: 200 };
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expect(
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evaluateLabBudget(
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{ metrics: { lcpMs: 1000, cls: 0, namedInteractionMs: 50 } },
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thresholds,
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),
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).toMatchObject({ passed: false });
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expect(
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evaluateLabBudget(
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{
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context: {
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runner: {},
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browser: {},
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viewport: {},
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network: {},
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cpu: {},
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cache: {},
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build: {},
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},
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metrics: { lcpMs: 2501, cls: 0, namedInteractionMs: 50 },
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},
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thresholds,
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).passed,
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).toBe(false);
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});
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it("uses the nearest-rank p75 and fails closed while sample minimum is deferred", () => {
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expect(percentile75([4, 1, 3, 2])).toBe(3);
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expect(
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evaluateFieldBudget(
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{
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metrics: { p75LcpMs: 1000, p75Cls: 0.01, p75InpMs: 50 },
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eligibleSamples: 100,
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},
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{
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p75LcpMs: 2500,
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p75Cls: 0.1,
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p75InpMs: 200,
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minimumEligibleSamples: null,
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},
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),
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).toEqual({ status: "FAIL_UNVERIFIED", passed: false });
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});
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});
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