Hermes/Tests/HermesTests/HermesTests.swift

@testable import Hermes
import XCTest

final class HermesTests: XCTestCase {
    override func setUp() {
        super.setUp()
        configureHermes()
    }
    
    private func configureHermes() {
        let defaultHeaders = ["Content-Type": "application/json"]
        let decodingStrategy = JSONDecoder.KeyDecodingStrategy.convertFromSnakeCase
        let config = HermesConfiguration(defaultHeaders: defaultHeaders, decodingStrategy: decodingStrategy)
        Hermes.shared.configure(config)
    }
    
    func testGetRequest() async throws {
        let queryParams = [URLQueryItem(name: "foo", value: "bar")]
        let resource = Resource(url: URL(string: "https://httpbin.org/get")!, method: .get(queryParams), modelType: GetResponse.self)
        
        let getResponse = try await Hermes.shared.load(resource)
        
        XCTAssertEqual(getResponse.url, "https://httpbin.org/get?foo=bar")
        XCTAssertEqual(getResponse.args.count, 1)
        XCTAssertGreaterThan(getResponse.headers.count, 0)
    }
    
    func testPostRequest() async throws {
        let postDatas = try? JSONEncoder().encode(["foo": "bar"])
        let resource = Resource(url: URL(string: "https://httpbin.org/post")!, method: .post(postDatas), modelType: PostResponse.self)
        
        let postResponse = try await Hermes.shared.load(resource)
        
        XCTAssertEqual(postResponse.url, "https://httpbin.org/post")
        XCTAssertEqual(postResponse.args.count, 0)
        XCTAssertNotNil(postResponse.json)
        XCTAssertEqual(postResponse.json?.count, 1)
        XCTAssertGreaterThan(postResponse.headers.count, 0)
    }
    
    func testPutRequest() async throws {
        let postDatas = try? JSONEncoder().encode(["foo": "bar"])
        let resource = Resource(url: URL(string: "https://httpbin.org/put")!, method: .put(postDatas), modelType: PostResponse.self)
        
        let putResponse = try await Hermes.shared.load(resource)
        
        XCTAssertEqual(putResponse.url, "https://httpbin.org/put")
        XCTAssertEqual(putResponse.args.count, 0)
        XCTAssertNotNil(putResponse.json)
        XCTAssertEqual(putResponse.json?.count, 1)
        XCTAssertGreaterThan(putResponse.headers.count, 0)
    }
    
    func testPatchRequest() async throws {
        let postDatas = try? JSONEncoder().encode(["foo": "bar"])
        let resource = Resource(url: URL(string: "https://httpbin.org/patch")!, method: .patch(postDatas), modelType: PostResponse.self)
        
        let patchResponse = try await Hermes.shared.load(resource)
        
        XCTAssertEqual(patchResponse.url, "https://httpbin.org/patch")
        XCTAssertEqual(patchResponse.args.count, 0)
        XCTAssertNotNil(patchResponse.json)
        XCTAssertEqual(patchResponse.json?.count, 1)
        XCTAssertGreaterThan(patchResponse.headers.count, 0)
    }
    
    func testDeleteRequest() async throws {
        let resource = Resource(url: URL(string: "https://httpbin.org/delete")!, method: .delete, modelType: PostResponse.self)
        
        let deleteResponse = try await Hermes.shared.load(resource)
        
        XCTAssertEqual(deleteResponse.url, "https://httpbin.org/delete")
        XCTAssertEqual(deleteResponse.args.count, 0)
        XCTAssertNil(deleteResponse.json)
        XCTAssertGreaterThan(deleteResponse.headers.count, 0)
    }
    
    func testNotFound() async throws {
        let resource = Resource(url: URL(string: "https://httpbin.org/status/404")!, method: .get(), modelType: GetResponse.self)
        
        do {
            let _ = try await Hermes.shared.load(resource)
            XCTFail("Expected to throw NetworkError.notFound")
        } catch NetworkError.notFound {
            XCTAssert(true)
        } catch {
            XCTFail("Unexpected error: \(error)")
        }
    }
    
    func testServerError() async throws {
        let resource = Resource(url: URL(string: "https://httpbin.org/status/500")!, method: .get(), modelType: GetResponse.self)
        
        do {
            let _ = try await Hermes.shared.load(resource)
            XCTFail("Expected to throw NetworkError.serverError")
        } catch NetworkError.serverError(_) {
            XCTAssert(true)
        } catch {
            XCTFail("Unexpected error: \(error)")
        }
    }
    
    func testDecodeError() async throws {
        let resource = Resource(url: URL(string: "https://httpbin.org/get")!, method: .get(), modelType: DummyResponse.self)
        
        do {
            let _ = try await Hermes.shared.load(resource)
            XCTFail("Expected to throw NetworkError.decodingError")
        } catch NetworkError.decodingError {
            XCTAssert(true)
        } catch {
            XCTFail("Unexpected error: \(error)")
        }
    }
}

struct GetResponse: Codable {
    let args: [String: String]
    let headers: [String: String]
    let origin: String
    let url: String
}

struct PostResponse: Codable {
    let args: [String: String]
    let data: String
    let files: [String: String]
    let form: [String: String]
    let headers: [String: String]
    let json: [String: String]?
    let origin: String
    let url: String
}

struct DummyResponse: Codable {
    let dumb: Int
    let dumber: Double
}