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final class WebClientTests: XCTestCase { | |
override func tearDown() { | |
TestURLProtocol.loadingHandler = nil | |
} | |
struct TestPayload: Codable, Equatable { | |
let country: String | |
} | |
func testFetchingDataSuccessfully() { | |
let expected = TestPayload(country: "Estonia") | |
let request = URLRequest(url: URL(string: "https://www.example.com")!) | |
let responseJSONData = try! JSONEncoder().encode(expected) | |
TestURLProtocol.loadingHandler = { request in | |
let response = HTTPURLResponse(url: request.url!, statusCode: 200, httpVersion: nil, headerFields: nil)! | |
return (response, responseJSONData, nil) | |
} | |
let expectation = XCTestExpectation(description: "Loading") | |
let configuration = URLSessionConfiguration.ephemeral | |
configuration.protocolClasses = [TestURLProtocol.self] | |
let client = WebClient(urlSession: URLSession(configuration: configuration)) | |
client.fetch(request, requestDataType: TestPayload.self) { (result) in | |
switch result { | |
case .failure(let error): | |
XCTFail("Request was not successful: \(error.localizedDescription)") | |
case .success(let payload): | |
XCTAssertEqual(payload, expected) | |
} | |
expectation.fulfill() | |
} | |
wait(for: [expectation], timeout: 1) | |
} | |
} |
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