my-files-sample/Libraries/Tests/APIServiceTests/Cases/Actors/APIService+GetDataTests.swift

//
//  APIService+GetDataTests.swift
//  APIServiceTests
//
//  Created by Javier Cicchelli on 04/12/2022.
//  Copyright © 2022 Röck+Cöde. All rights reserved.
//

import Foundation
import XCTest

@testable import APIService

final class APIServiceGetDataTests: XCTestCase {

    // MARK: Properties
    
    private let sessionConfiguration = {
        let configuration = URLSessionConfiguration.default
        
        configuration.protocolClasses = [MockURLProtocol.self]
        
        return configuration
    }()
    
    private let itemId = UUID().uuidString
    private let url = URL(string: "http://163.172.147.216:8080/items/")!
    
    private var service: APIService!
    private var data: Data!
    private var result: Data!
    
    // MARK: Setup
    
    override func setUp() async throws {
        service = .init(configuration: sessionConfiguration)
    }
    
    override func tearDown() async throws {
        service = nil
    }
    
    // MARK: Test cases
    
    func test_withExistingFileId_andRightCredentials() async throws {
        // GIVEN
        data = "This is just a simple text for testing purposes.".data(using: .utf8)
        
        MockURLProtocol.mockData[url.appendingPathComponent(itemId + "/data")] = MockURLResponse(
            status: .ok,
            headers: [.Header.Keys.contentType: .Header.Values.contentTypeOctet],
            data: data
        )
        
        // WHEN
        result = try await service.getData(
            id: itemId,
            credentials: .init(
                username: "username",
                password: "password"
            )
        )
        
        // THEN
        XCTAssertEqual(result, data)
    }
    
    func test_withExistingFileId_andWrongCredentials() async throws {
        // GIVEN
        MockURLProtocol.mockData[url.appendingPathComponent(itemId + "/data")] = MockURLResponse(
            status: .unauthorized,
            headers: [:],
            data: nil
        )
        
        // WHEN & THEN
        do {
            _ = try await service.getData(
                id: itemId,
                credentials: .init(
                    username: "usrname",
                    password: "passwrd"
                )
            )
        } catch APIClientError.authenticationFailed {
            XCTAssertTrue(true)
        } catch {
            XCTAssertTrue(false)
        }
    }
    
    func test_withNonExistingFileId_andRightCredentials() async throws {
        // GIVEN
        MockURLProtocol.mockData[url.appendingPathComponent(itemId + "/data")] = MockURLResponse(
            status: .notFound,
            headers: [:],
            data: nil
        )
        
        // WHEN & THEN
        do {
            _ = try await service.getData(
                id: itemId,
                credentials: .init(
                    username: "username",
                    password: "password"
                )
            )
        } catch APIClientError.itemDoesNotExist {
            XCTAssertTrue(true)
        } catch {
            XCTAssertTrue(false)
        }
    }
    
    func test_withEmptyFileId_andRightCredentials() async throws {
        // GIVEN
        MockURLProtocol.mockData[url.appendingPathComponent("/data")] = MockURLResponse(
            status: .badRequest,
            headers: [:],
            data: nil
        )
        
        // WHEN & THEN
        do {
            _ = try await service.getData(
                id: "",
                credentials: .init(
                    username: "username",
                    password: "password"
                )
            )
        } catch APIClientError.itemIsNotFile {
            XCTAssertTrue(true)
        } catch {
            XCTAssertTrue(false)
        }
    }
    
    func test_withSomeFolderId_andRightCredentials() async throws {
        // GIVEN
        MockURLProtocol.mockData[url.appendingPathComponent(itemId + "/data")] = MockURLResponse(
            status: .badRequest,
            headers: [:],
            data: nil
        )
        
        // WHEN & THEN
        do {
            _ = try await service.getData(
                id: itemId,
                credentials: .init(
                    username: "username",
                    password: "password"
                )
            )
        } catch APIClientError.itemIsNotFile {
            XCTAssertTrue(true)
        } catch {
            XCTAssertTrue(false)
        }
    }

}