What are mocking and stubbing techniques for SwiftUI in Swift?

Mocking and stubbing are crucial techniques in SwiftUI development for unit testing. They allow developers to isolate components, simulate behavior, and ensure that the code works as expected without relying on external systems. Mocking involves creating a fake implementation of a class or protocol that mimics the original behavior, while stubbing is used to simulate specific responses from dependencies.

Example of Mocking and Stubbing in SwiftUI


        // Protocol defining the service
        protocol DataService {
            func fetchData() -> String
        }

        // Mock class implementing the service
        class MockDataService: DataService {
            func fetchData() -> String {
                return "Mock Data"
            }
        }

        // Your view model that uses the DataService
        class ViewModel: ObservableObject {
            @Published var data: String = ""
            var dataService: DataService

            init(dataService: DataService) {
                self.dataService = dataService
            }

            func loadData() {
                data = dataService.fetchData()
            }
        }

        // Example usage in SwiftUI View
        struct ContentView: View {
            @StateObject var viewModel: ViewModel

            var body: some View {
                Text(viewModel.data)
                    .onAppear {
                        viewModel.loadData()
                    }
            }
        }

        // Test case using the MockDataService
        func testViewModel() {
            let mockService = MockDataService()
            let viewModel = ViewModel(dataService: mockService)
            viewModel.loadData()
            assert(viewModel.data == "Mock Data")
        }

What are mocking and stubbing techniques for SwiftUI in Swift?

Example of Mocking and Stubbing in SwiftUI

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What are mocking and stubbing techniques for SwiftUI in Swift?

Example of Mocking and Stubbing in SwiftUI

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