problems.test.ts•2.01 kB
import { describe, it, expect } from 'vitest';
import { detectProblems } from '../../../src/analyzers/problems.js';
const makeReport = () => ({
categories: {
performance: {
auditRefs: [
{ id: 'first-contentful-paint', weight: 10 },
{ id: 'speed-index', weight: 20 },
],
},
},
audits: {
'first-contentful-paint': {
score: 0.5,
title: 'First Contentful Paint',
description: 'Paint quickly',
},
'speed-index': {
score: 0.8,
title: 'Speed Index',
description: 'Overall speed',
},
'third-party-summary': {
score: 0.95,
title: 'Third party summary',
description: 'Informative',
},
},
});
describe('detectProblems', () => {
it('calculates weighted impact using audit weights', () => {
const report = makeReport();
const result = detectProblems(report as any);
const fcp = result.find(problem => problem.id === 'first-contentful-paint');
const speedIndex = result.find(problem => problem.id === 'speed-index');
expect(fcp).toBeDefined();
expect(speedIndex).toBeDefined();
expect(fcp?.weight).toBeCloseTo(10 / 30, 5);
expect(speedIndex?.weight).toBeCloseTo(20 / 30, 5);
const expectedFcpImpact = (1 - 0.5) * 100 * (10 / 30);
const expectedSiImpact = (1 - 0.8) * 100 * (20 / 30);
expect(fcp?.weightedImpact).toBeCloseTo(expectedFcpImpact, 5);
expect(speedIndex?.weightedImpact).toBeCloseTo(expectedSiImpact, 5);
// Highest weighted impact should come first
expect(result[0].id).toBe('first-contentful-paint');
});
it('falls back to heuristic category when weight not defined', () => {
const report = makeReport();
delete (report.categories as any).performance;
const result = detectProblems(report as any);
const fcp = result.find(problem => problem.id === 'first-contentful-paint');
expect(fcp?.category).toBe('rendering');
expect(fcp?.weight).toBe(0);
expect(fcp?.weightedImpact).toBe(0);
});
});