To test the market statistics display with sample data, follow these steps: 1. First, create a sample data structure that mimics the data returned by your smart contracts. For example: ```javascript const sampleMarketStats = { marketId: "0x1234", title: "Example Market", startTime: 1623456789, endTime: 1623456789, totalBets: 100, totalVolume: 5.5, odds: { yes: 1.5, no: 2.3 }, status: "active" }; ``` 2. Create a mock data provider function that returns this sample data with a slight delay to simulate real-world API calls: ```javascript const getSampleMarketStats = () => { return new Promise(resolve => { setTimeout(() => { resolve(sampleMarketStats); }, 1000); }); }; ``` 3. In your React component, use this mock function to test the display: ```javascript import { useState, useEffect } from 'react'; const MarketStatsDisplay = () => { const [marketStats, setMarketStats] = useState(null); const [loading, setLoading] = useState(true); const [error, setError] = useState(null); useEffect(() => { const loadMarketStats = async () => { try { const stats = await getSampleMarketStats(); setMarketStats(stats); setLoading(false); } catch (err) { setError(err.message); setLoading(false); } }; loadMarketStats(); }, []); if (loading) return

; if (error) return

Error: {error}

; return (

{marketStats.title}

Total Bets: {marketStats.totalBets}

Total Volume: {marketStats.totalVolume}

Odds: Yes - {marketStats.odds.yes}, No - {marketStats.odds.no}

Status: {marketStats.status}

); }; ``` 4. Write unit tests for the component using Jest and React Testing Library: ```javascript import React from 'react'; import { render, waitFor } from '@testing-library/react-native'; import MarketStatsDisplay from './MarketStatsDisplay'; describe('MarketStatsDisplay', () => { it('should display market statistics', async () => { const { getByText, getByRole } = render(); await waitFor(() => { expect(getByText('Example Market')).toBeTruthy(); expect(getByText('Total Bets: 100')).toBeTruthy(); expect(getByText('Total Volume: 5.5')).toBeTruthy(); expect(getByText('Odds: Yes - 1.5, No - 2.3')).toBeTruthy(); expect(getByText('Status: active')).toBeTruthy(); }); }); it('should show loading state initially', () => { const { getByText } = render(); expect(getByText('Loading...')).toBeTruthy(); }); it('should show error message if data fetch fails', async () => { jest.spyOn(global, 'fetch').mockRejectedValueOnce(new Error('Failed to fetch')); const { getByText } = render(); await waitFor(() => { expect(getByText('Error: Failed to fetch')).toBeTruthy(); }); }); }); ``` 5. Test different scenarios: - Test with sample data - Test loading states - Test error states - Test empty data scenarios 6. Use browser developer tools to inspect the component and verify the DOM structure. To learn more about testing React components, check out: - [React Testing Library Documentation](https://testing-library.com/docs/react-testing-library/intro) - [Jest Documentation](https://jestjs.io/docs/getting-started) - [Cypress Documentation](https://docs.cypress.io/guides/overview/why-cypress) After completing this task, you should move on to testing the balance display with different user accounts.