testViewControllerFailure

testViewControllerFailure

func testViewControllerFailure() {
    let expect = expectation(description: #function)
    let viewController = ViewController()
    
    URLProtocolMock.requestHandler = { request in
        throw NSError.init(domain: "", code: 400, userInfo: [:])
    }
    
    let configuration = URLSessionConfiguration.af.default
    configuration.protocolClasses = [URLProtocolMock.self] + (configuration.protocolClasses ?? [])
    
    let session = Session(configuration: configuration)
    
    let networkManager = NetworkManager(
        session: session,
        router: JSONPlaceHolderAPIAction.getToDo(id: 2))
    
    viewController.downloadData(networkManager, completion: { response in
        switch response {
        case .failure(let error):
            XCTAssertNotNil(error)
            expect.fulfill()
        case .success:
            XCTFail()
        }
    })
    wait(for: [expect], timeout: 1.0)
}