https://mastodon.social/@ethanhuang13/110904915670262949

JSONEncoderTests.swift

// iOS 17's JSONEncoder is rarely producing a different key sorting order(< 5%), which is ok for JSON itself, but will cause flaky tests.
// It wasn't happened pre-iOS 17.
// https://mastodon.social/@ethanhuang13/110904915670262949

import XCTest

final class JSONEncoderTests: XCTestCase {
  func testEncode() {
    struct Model: Codable {
      var a: String = ""
      var b: String = ""
      var c: String = ""
    }

    let model = Model()
    let encoder = JSONEncoder()
//    encoder.outputFormatting = .sortedKeys // Uncomment to fix the flaky test
    let data1 = try! encoder.encode(model)
    let data2 = try! encoder.encode(model)
    XCTAssertEqual(
      String(decoding: data1, as: UTF8.self),
      String(decoding: data2, as: UTF8.self)
    )
  }
}