packages/oauth/test/refresh-threshold.test.ts

/**
 * defaultRefreshThreshold — three boundary cases.
 *
 * Formula (oauth-manager.ts:39-44):
 *   threshold = max(MIN_REFRESH_THRESHOLD_SECONDS, expiresIn * 0.5)
 * where MIN_REFRESH_THRESHOLD_SECONDS = 300 and 0 / negative expiresIn
 * fall back to MIN (the implementation short-circuits on `> 0`).
 */

import { describe, expect, it } from 'vitest';

import { defaultRefreshThreshold } from '../src/oauth-manager';

describe('defaultRefreshThreshold — boundary cases', () => {
  it('returns expiresIn * 0.5 when ratio exceeds the 300s minimum (expiresIn=1800 → 900)', () => {
    // 1800 * 0.5 = 900 > 300.
    expect(defaultRefreshThreshold(1800)).toBe(900);
  });

  it('clamps to the 300s minimum when expiresIn * 0.5 falls below (expiresIn=500 → 300)', () => {
    // 500 * 0.5 = 250 < 300, so the floor wins.
    expect(defaultRefreshThreshold(500)).toBe(300);
  });

  it('falls back to the 300s minimum when expiresIn is 0 (expiresIn=0 → 300)', () => {
    // A pathological token with no lifetime still refreshes on a fixed
    // cadence; never produces a zero threshold.
    expect(defaultRefreshThreshold(0)).toBe(300);
  });
});