Nova-Rewards/src/hooks/__tests__/usePolling.test.ts at main · ghzhost/Nova-Rewards · GitHub

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import { renderHook, act, waitFor } from '@testing-library/react';
import { usePolling } from '../usePolling';

describe('usePolling', () => {
  beforeEach(() => {
    jest.useFakeTimers();
  });

  afterEach(() => {
    jest.useRealTimers();
  });

  it('should fetch data on mount', async () => {
    const mockFetch = jest.fn().mockResolvedValue({ data: 'test' });

    renderHook(() => usePolling({
      fetchFn: mockFetch,
      interval: 15000,
    }));

    expect(mockFetch).toHaveBeenCalledTimes(1);
  });

  it('should poll at specified interval', async () => {
    const mockFetch = jest.fn().mockResolvedValue({ data: 'test' });

    renderHook(() => usePolling({
      fetchFn: mockFetch,
      interval: 15000,
    }));

    expect(mockFetch).toHaveBeenCalledTimes(1);

    act(() => {
      jest.advanceTimersByTime(15000);
    });

    await waitFor(() => {
      expect(mockFetch).toHaveBeenCalledTimes(2);
    });
  });

  it('should pause polling when tab is hidden', () => {
    const mockFetch = jest.fn().mockResolvedValue({ data: 'test' });

    renderHook(() => usePolling({
      fetchFn: mockFetch,
      interval: 15000,
    }));

    expect(mockFetch).toHaveBeenCalledTimes(1);

    // Hide tab
    Object.defineProperty(document, 'visibilityState', { value: 'hidden', configurable: true });
    document.dispatchEvent(new Event('visibilitychange'));

    act(() => {
      jest.advanceTimersByTime(15000);
    });

    // Should not have fetched again
    expect(mockFetch).toHaveBeenCalledTimes(1);
  });

  it('should implement exponential backoff on failure', async () => {
    const mockFetch = jest.fn().mockRejectedValue(new Error('Failed'));

    renderHook(() => usePolling({
      fetchFn: mockFetch,
      interval: 15000,
      maxRetries: 3,
      retryDelay: 1000,
    }));

    expect(mockFetch).toHaveBeenCalledTimes(1);

    // Should retry after 1 second
    act(() => {
      jest.advanceTimersByTime(1000);
    });

    await waitFor(() => {
      expect(mockFetch).toHaveBeenCalledTimes(2);
    });

    // Should retry after 2 seconds
    act(() => {
      jest.advanceTimersByTime(2000);
    });

    await waitFor(() => {
      expect(mockFetch).toHaveBeenCalledTimes(3);
    });
  });

  it('should stop polling on unmount', () => {
    const mockFetch = jest.fn().mockResolvedValue({ data: 'test' });

    const { unmount } = renderHook(() => usePolling({
      fetchFn: mockFetch,
      interval: 15000,
    }));

    expect(mockFetch).toHaveBeenCalledTimes(1);

    unmount();

    act(() => {
      jest.advanceTimersByTime(15000);
    });

    expect(mockFetch).toHaveBeenCalledTimes(1);
  });
});