I'm used to wait for expectations when using XCTest, but I'm completely stumped by the seemingly-absent option for expecting some parts of my code to be called in Swift Testing 🤔
Consider the following:
protocol MyAPI {
func getData() async throws -> String
}
class MockAPI: MyAPI {
let stub: () async throws -> String
init(stub: @escaping () async throws -> String = { "hello" }) {
self.stub = stub
}
func getData() async throws -> String {
try await stub()
}
}
Which is being used in my view model:
class MyViewModel: ObservableObject {
private let api: MyAPI
@Published
var data: String
init(api: MyAPI) {
self.api = api
}
func refresh() async throws {
self.data = try await api.getData()
}
}
When I wrote tests in the past, I would simply override the stub of the MockAPI implementation and fulfill an expectation in there:
class MyViewModelTests: XCTestCase {
func testModelCallsAPIOnRefresh() async throws {
let expectCallsAPI = expectation("Model should call API")
let api = MockAPI {
expectCallsAPI.fulfill()
return "hello"
}
let model = MyViewModel(api: api)
try await model.refresh()
await fulfillment(of: [expectCallsAPI], timeout: 1)
}
}
How would I go about checking that my model does indeed call the API when using Swift Testing?