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| 1 | +import { describe, expect, it, vi, beforeEach, afterEach } from 'vitest'; |
| 2 | +import { act, renderHook } from '@testing-library/react'; |
| 3 | +import { useStaleData } from '@/hooks/useStaleData'; |
| 4 | + |
| 5 | +describe('useStaleData', () => { |
| 6 | + beforeEach(() => { |
| 7 | + vi.useFakeTimers(); |
| 8 | + vi.setSystemTime(new Date('2026-05-28T00:00:00Z')); |
| 9 | + }); |
| 10 | + afterEach(() => { |
| 11 | + vi.useRealTimers(); |
| 12 | + }); |
| 13 | + |
| 14 | + it('reports the data as fresh when lastFetchedAt is within the window', () => { |
| 15 | + const now = Date.now(); |
| 16 | + const { result } = renderHook(() => |
| 17 | + useStaleData(now - 10_000, { thresholdMs: 60_000, autoEvaluate: false }) |
| 18 | + ); |
| 19 | + expect(result.current.stale).toBe(false); |
| 20 | + expect(result.current.ageMs).toBe(10_000); |
| 21 | + }); |
| 22 | + |
| 23 | + it('reports the data as stale once the timestamp crosses the threshold', () => { |
| 24 | + const now = Date.now(); |
| 25 | + const { result } = renderHook(() => |
| 26 | + useStaleData(now - 60_000, { thresholdMs: 60_000, autoEvaluate: false }) |
| 27 | + ); |
| 28 | + expect(result.current.stale).toBe(true); |
| 29 | + }); |
| 30 | + |
| 31 | + it('fires onStale exactly once per lastFetchedAt epoch', () => { |
| 32 | + const onStale = vi.fn(); |
| 33 | + const now = Date.now(); |
| 34 | + |
| 35 | + const { rerender } = renderHook( |
| 36 | + ({ ts }) => |
| 37 | + useStaleData(ts, { |
| 38 | + thresholdMs: 60_000, |
| 39 | + autoEvaluate: false, |
| 40 | + onStale, |
| 41 | + }), |
| 42 | + { initialProps: { ts: now - 90_000 } } |
| 43 | + ); |
| 44 | + |
| 45 | + // Stale from the get-go → fires once. |
| 46 | + expect(onStale).toHaveBeenCalledTimes(1); |
| 47 | + |
| 48 | + // Re-render with the SAME timestamp: must not fire again. |
| 49 | + rerender({ ts: now - 90_000 }); |
| 50 | + expect(onStale).toHaveBeenCalledTimes(1); |
| 51 | + |
| 52 | + // New fetch baseline (fresh again) → no additional fire. |
| 53 | + rerender({ ts: now }); |
| 54 | + expect(onStale).toHaveBeenCalledTimes(1); |
| 55 | + |
| 56 | + // And when THAT new epoch goes stale, we fire one more time. |
| 57 | + rerender({ ts: now - 90_000 }); |
| 58 | + expect(onStale).toHaveBeenCalledTimes(2); |
| 59 | + }); |
| 60 | + |
| 61 | + it('does not fire onStale when the data is fresh', () => { |
| 62 | + const onStale = vi.fn(); |
| 63 | + renderHook(() => |
| 64 | + useStaleData(Date.now() - 5_000, { |
| 65 | + thresholdMs: 60_000, |
| 66 | + autoEvaluate: false, |
| 67 | + onStale, |
| 68 | + }) |
| 69 | + ); |
| 70 | + expect(onStale).not.toHaveBeenCalled(); |
| 71 | + }); |
| 72 | + |
| 73 | + it('auto-evaluates exactly at the staleness boundary', () => { |
| 74 | + const onStale = vi.fn(); |
| 75 | + const ts = Date.now() - 10_000; // 50s of headroom on a 60s window |
| 76 | + const { result } = renderHook(() => |
| 77 | + useStaleData(ts, { thresholdMs: 60_000, onStale }) |
| 78 | + ); |
| 79 | + expect(result.current.stale).toBe(false); |
| 80 | + |
| 81 | + act(() => { |
| 82 | + vi.advanceTimersByTime(50_000); |
| 83 | + }); |
| 84 | + expect(result.current.stale).toBe(true); |
| 85 | + expect(onStale).toHaveBeenCalledTimes(1); |
| 86 | + }); |
| 87 | + |
| 88 | + it('treats a null/undefined timestamp as stale', () => { |
| 89 | + const onStale = vi.fn(); |
| 90 | + const { result } = renderHook(() => |
| 91 | + useStaleData(null, { |
| 92 | + thresholdMs: 60_000, |
| 93 | + autoEvaluate: false, |
| 94 | + onStale, |
| 95 | + }) |
| 96 | + ); |
| 97 | + expect(result.current.stale).toBe(true); |
| 98 | + expect(onStale).toHaveBeenCalledTimes(1); |
| 99 | + }); |
| 100 | + |
| 101 | + it('exposes a revalidate() escape hatch that re-evaluates without changing inputs', () => { |
| 102 | + const ts = Date.now() - 30_000; |
| 103 | + const { result } = renderHook(() => |
| 104 | + useStaleData(ts, { thresholdMs: 60_000, autoEvaluate: false }) |
| 105 | + ); |
| 106 | + expect(result.current.stale).toBe(false); |
| 107 | + |
| 108 | + // Advance the wall clock without auto-eval scheduling, then revalidate. |
| 109 | + vi.setSystemTime(new Date(Date.now() + 60_000)); |
| 110 | + act(() => { |
| 111 | + result.current.revalidate(); |
| 112 | + }); |
| 113 | + expect(result.current.stale).toBe(true); |
| 114 | + }); |
| 115 | +}); |
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