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// Mock return value jest.fn().mockReturnValue('fixed value') jest.fn().mockResolvedValue('async value') jest.fn().mockImplementation(arg => arg * 2)

In the modern landscape of frontend development, writing the code is only half the battle. Ensuring that code works as expected—and continues to work as you add features—is what separates hobby projects from production-ready applications. React Testing Library and Jest- The Complete Guide

expect(result.current.count).toBe(1) )