How to Mock TypeScript Interfaces in Jest for Frontend Testing of a React Component?
I'm trying to configure Quick question that's been bugging me - Currently developing a React application using TypeScript and Jest for automated testing. I've reached a point where I need to mock a complex interface to ensure my component renders correctly under different conditions. The interface looks like this: ```typescript interface User { id: number; name: string; email: string; address: { street: string; city: string; zipcode: string; }; } ``` For my test, I want to simulate multiple user scenarios. Here’s what I’ve been trying to mock: ```typescript const mockUser: User = { id: 1, name: 'John Doe', email: 'john@example.com', address: { street: '123 Main St', city: 'Anytown', zipcode: '12345', }, }; ``` While calling the component like so: ```typescript <ProfileComponent user={mockUser} /> ``` I realized that when the component attempts to display the user's address, it fails to handle the case where the address might be undefined or incomplete. I've added checks in my component code, but the tests still seem to produce unexpected results. Could anyone suggest a good strategy for creating tests that account for potentially undefined properties or variations in the mocked interface? I’ve also experimented with using `jest.mock` to create a mock implementation, but that feels a bit overkill for this situation. Alternatively, I read somewhere that using utilities like `partial` from `lodash` could simplify the mock creation, but I'm unsure how to integrate that with TypeScript interfaces effectively. Any insights or examples would be greatly appreciated. Also, it might be helpful to mention that I’m using Jest version 27.0.6 and React Testing Library, so suggestions tailored to those tools would be most applicable. I'm working on a API that needs to handle this. What's the best practice here? This is for a CLI tool running on Windows 10. Any pointers in the right direction? My team is using Typescript for this mobile app. Is there a better approach?