🧪 Add NetworkProvider Tests

Author: WhiteHyun

Core/Tests/CoreTests/CoreTests.swift

@@ -0,0 +1,23 @@
+//
+//  MockEndPoint.swift
+//
+//
+//  Created by 홍승현 on 5/7/24.
+//
+
+import Foundation
+import NetworkAPIKit
+
+struct MockEndPoint: EndPoint {
+  var method: HTTPMethod
+  var path: String
+  var parameters: HTTPParameter
+  var headers: [String: String]
+
+  init(method: HTTPMethod, path: String, parameters: HTTPParameter = .plain, headers: [String: String] = [:]) {
+    self.method = method
+    self.path = path
+    self.parameters = parameters
+    self.headers = headers
+  }
+}

Core/Tests/CoreTests/Mock/MockEndPoint.swift

@@ -0,0 +1,35 @@
+//
+//  MockURLProtocol.swift
+//
+//
+//  Created by 홍승현 on 5/7/24.
+//
+
+import Foundation
+
+class MockURLProtocol: URLProtocol {
+  static var mockData: Data?
+  static var mockError: Error?
+  static var mockStatusCode: Int?
+
+  override class func canInit(with _: URLRequest) -> Bool {
+    true
+  }
+
+  override class func canonicalRequest(for request: URLRequest) -> URLRequest {
+    request
+  }
+
+  override func startLoading() {
+    if let error = MockURLProtocol.mockError {
+      client?.urlProtocol(self, didFailWithError: error)
+    } else {
+      let response = HTTPURLResponse(url: request.url!, statusCode: MockURLProtocol.mockStatusCode ?? 200, httpVersion: nil, headerFields: nil)
+      client?.urlProtocol(self, didReceive: response!, cacheStoragePolicy: .notAllowed)
+      client?.urlProtocol(self, didLoad: MockURLProtocol.mockData ?? Data())
+    }
+    client?.urlProtocolDidFinishLoading(self)
+  }
+
+  override func stopLoading() {}
+}

Core/Tests/CoreTests/Mock/MockURLProtocol.swift

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+@testable import NetworkAPIKit
+import XCTest
+
+// MARK: - NetworkProviderTests
+
+final class NetworkProviderTests: XCTestCase {
+  struct TestModel: Codable, Equatable {
+    let id: Int
+    let name: String
+  }
+
+  var networkProvider: NetworkProvider!
+  var mockURLSession: URLSession!
+
+  override func setUp() {
+    super.setUp()
+    let configuration = URLSessionConfiguration.ephemeral
+    configuration.protocolClasses = [MockURLProtocol.self]
+    mockURLSession = URLSession(configuration: configuration)
+    networkProvider = NetworkProvider(session: mockURLSession)
+  }
+
+  override func tearDown() {
+    networkProvider = nil
+    mockURLSession = nil
+    super.tearDown()
+  }
+
+  func testRequest_Success() async throws {
+    // Given
+    let expectedModel = TestModel(id: 1, name: "Test")
+    let mockData = try JSONEncoder().encode(expectedModel)
+    MockURLProtocol.mockData = mockData
+    MockURLProtocol.mockStatusCode = 200
+
+    let endPoint = MockEndPoint(method: .get, path: "/path")
+
+    // When
+    let result: TestModel = try await networkProvider.request(with: endPoint)
+
+    // Then
+    XCTAssertEqual(result, expectedModel)
+  }
+
+  func testRequest_Failure() async throws {
+    // Given
+    MockURLProtocol.mockError = NetworkError.failedResponse(statusCode: 400)
+
+    let endPoint = MockEndPoint(method: .get, path: "/path")
+
+    // When
+    do {
+      let _: TestModel = try await networkProvider.request(with: endPoint)
+      XCTFail("Expected to throw an error")
+    } catch {
+      // Then
+      XCTAssertEqual((error as? NetworkError)?.errorDescription, NetworkError.failedResponse(statusCode: 400).errorDescription)
+    }
+  }
+}