hoge_decode_test.swift

gistfile1.txt

import XCTest

class WassyoiTests: XCTestCase {

    override func setUp() {
    
    }

    override func tearDown() {
    
    }
    
    func testDecodeHogeInfo() {
        let data = """
    {
        "hoge_key": null
    }
    """.data(using: .utf8)!
        
        var i: HogeInfo?
        do {
            i = try JSONDecoder().decode(HogeInfo.self, from: data)
        } catch let DecodingError.dataCorrupted(context) {
            print(context)
            XCTFail("should be decoded.")
        } catch let DecodingError.keyNotFound(key, context) {
            print("Key '\(key)' not found:", context.debugDescription)
            print("codingPath:", context.codingPath)
            XCTFail("should be decoded.")
        } catch let DecodingError.valueNotFound(value, context) {
            print("Value '\(value)' not found:", context.debugDescription)
            print("codingPath:", context.codingPath)
            XCTFail("should be decoded.")
        } catch let DecodingError.typeMismatch(type, context)  {
            print("Type '\(type)' mismatch:", context.debugDescription)
            print("codingPath:", context.codingPath)
            XCTFail("should be decoded.")
        } catch {
            print("error: ", error)
            XCTFail("should be decoded.")
        }
        
        print(i?.hoge)
        XCTAssertNil(i?.hoge)
    }
}

struct HogeInfo {
    let hoge: Hoge?
}

extension HogeInfo: Codable {
    enum Keys: String, CodingKey {
        case hogeKey = "hoge_key"
    }
    
    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: Keys.self)
        ////////////////////////////////↓ここにハテナいるねん/////////////////////////////
        hoge = try container.decode(Hoge?.self, forKey: .hogeKey)
    }
}

struct Hoge: Codable {
    let id: Int
    let title: String
    let url: URL
}

extension Hoge {
    enum CodingKeys: String, CodingKey {
        case id
        case title
        case url
    }
    
    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        id = try container.decode(Int.self, forKey: .id)
        title = try container.decode(String.self, forKey: .title)
        url = try container.decode(URL.self, forKey: .url)
    }
}