I have the following protocol that a NetworkEngine conforms to:
protocol NetworkEngineProtocol {
func request<T: Decodable>(from endpoint: Endpoint) async throws -> T
}
This protocol is passed as a dependency into a custom ViewModel and I want to unit test the request method of the ViewModel, that itself calls the dependency request method.
class ViewModel: ViewModelProtocol {
var passthrough: PassthroughSubject<[SomeProperty], Never> = PassthroughSubject<[SomeProperty], Never>()
private let networkEngine: NetworkEngineProtocol
init(networkEngine: NetworkEngineProtocol) {
self.networkEngine = networkEngine
}
func request() {
Task {
do {
let model = try await networkEngine.request(from: .messages()) as CustomModel
// ... do more stuff
passthrough.send(someValue) // would want to test this
} catch let err as NetworkEngineErrors {
// ... error handling
}
}
}
}
struct CustomModel: Decodable {
let message: [String]
let status: String
}
In order to Unit Test this method, I'd have to create a Mock class, that conforms to the NetworkEngineProtocol.
Something like:
class MockNetworkProtocol: NetworkEngineProtocol {
init() {}
func request<T>(from endpoint: Endpoint) async throws -> T where T : Decodable {
// how to mock this?
}
}
What's the best way to do this? How can I mock the request method of the NetworkEngine?
Thanks
ivancantarino
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