Function withHubEnv

test/proxyHubUrlDefault.test.js:11–24

(overrides, fn)

// Save/restore every env var resolveHubUrl() consults so cases don't leak.
const HUB_ENV = ['A2A_HUB_URL', 'EVOMAP_HUB_URL', 'EVOLVER_DEFAULT_HUB_URL', 'EVOMAP_HUB_ALLOW_INSECURE'];
function withHubEnv(overrides, fn) {
  const saved = {};
  for (const k of HUB_ENV) saved[k] = process.env[k];
  for (const k of HUB_ENV) delete process.env[k];
  for (const [k, v] of Object.entries(overrides)) process.env[k] = v;
  try {
    return fn();
  } finally {
    for (const k of HUB_ENV) {
      if (saved[k] === undefined) delete process.env[k];
      else process.env[k] = saved[k];
    }
  }
}

// evolver#567: a freshly-constructed proxy with no explicit Hub URL must default
// to the canonical public Hub instead of '' (hub-less/offline). Previously the