dd0c/products/04-lightweight-idp/tests/unit/ownership.test.ts

import { describe, it, expect } from 'vitest';
import { resolveOwnership, type OwnershipRecord } from '../../src/catalog/service.js';

describe('Ownership Resolution', () => {
  it('explicit config overrides AWS tag', () => {
    const candidates: OwnershipRecord[] = [
      { owner: 'team-infra', source: 'aws-tag', confidence: 1 },
      { owner: 'team-platform', source: 'config', confidence: 1 },
    ];
    const result = resolveOwnership(candidates);
    expect(result.owner).toBe('team-platform');
    expect(result.source).toBe('config');
  });

  it('CODEOWNERS overrides AWS tag', () => {
    const candidates: OwnershipRecord[] = [
      { owner: 'team-infra', source: 'aws-tag', confidence: 1 },
      { owner: 'team-platform', source: 'codeowners', confidence: 1 },
    ];
    const result = resolveOwnership(candidates);
    expect(result.owner).toBe('team-platform');
    expect(result.source).toBe('codeowners');
  });

  it('AWS tag overrides heuristic', () => {
    const candidates: OwnershipRecord[] = [
      { owner: 'dev@other.com', source: 'heuristic', confidence: 0.5 },
      { owner: 'team-infra', source: 'aws-tag', confidence: 1 },
    ];
    const result = resolveOwnership(candidates);
    expect(result.owner).toBe('team-infra');
  });

  it('heuristic does not override explicit config', () => {
    const candidates: OwnershipRecord[] = [
      { owner: 'team-platform', source: 'config', confidence: 1 },
      { owner: 'dev@other.com', source: 'heuristic', confidence: 0.8 },
    ];
    const result = resolveOwnership(candidates);
    expect(result.owner).toBe('team-platform');
  });

  it('returns unknown for empty candidates', () => {
    const result = resolveOwnership([]);
    expect(result.owner).toBe('unknown');
    expect(result.source).toBe('heuristic');
    expect(result.confidence).toBe(0);
  });

  it('config > codeowners > aws-tag > heuristic (full chain)', () => {
    const candidates: OwnershipRecord[] = [
      { owner: 'heuristic-team', source: 'heuristic', confidence: 0.3 },
      { owner: 'aws-team', source: 'aws-tag', confidence: 0.8 },
      { owner: 'codeowners-team', source: 'codeowners', confidence: 0.9 },
      { owner: 'config-team', source: 'config', confidence: 1 },
    ];
    const result = resolveOwnership(candidates);
    expect(result.owner).toBe('config-team');
  });
});