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6:12 - testUpdatingSmoothiesFromServer Sample

import XCTest
@testable import Fruta

class SmoothieNetworkingTests: XCTestCase {
    func testUpdatingSmoothiesFromServer() throws {
        let originalSmoothies = Smoothie.all
        try Smoothie.fetchSynchronouslyFromServer()
        XCTAssertNotEqual(originalSmoothies, Smoothie.all)
    }
}

7:56 - Interesting Spindump Content

11  __26-[XCTestCase performTest:]_block_invoke_2 + 43 (XCTest + 167518) [0x105a70e5e] 1-11
  11  -[XCTestCase invokeTest] + 1069 (XCTest + 161187) [0x105a6f5a3] 1-11
    11  -[XCTestCase(XCTIssueHandling) _caughtUnhandledDeveloperExceptionPermittingControlFlowInterruptions:caughtInterruptionException:whileExecutingBlock:] + 183 (XCTest + 535831) [0x105acad17] 1-11
      11  __24-[XCTestCase invokeTest]_block_invoke.239 + 129 (XCTest + 162434) [0x105a6fa82] 1-11
        11  +[XCTSwiftErrorObservation observeErrorsInBlock:] + 69 (XCTest + 811868) [0x105b0e35c] 1-11
          11  __24-[XCTestCase invokeTest]_block_invoke_2 + 52 (XCTest + 162709) [0x105a6fb95] 1-11
            11  ??? [0x7fff20438bf6] 1-11
              11  ??? [0x7fff2043b73c] 1-11
                11  @objc SmoothieNetworkingTests.testUpdatingSmoothiesFromServer() + 74 (<compiler-generated> in Fruta Unit Tests + 23882) [0x105d35d4a] 1-11
                  11  SmoothieNetworkingTests.testUpdatingSmoothiesFromServer() + 132 (Networking.swift:12,22 in Fruta Unit Tests + 22756) [0x105d358e4] 1-11
                    11  static Smoothie.fetchSynchronouslyFromServer() + 163 (Smoothie.swift:61,26 in Fruta + 374563) [0x10532f723] 1-11
                      11  static Smoothie.performGETRequest(to:) + 179 (Smoothie.swift:73,31 in Fruta + 375475) [0x10532fab3] 1-11
                        11  -[PKAppleAccountInformation appleID] + 6 (PassKitCore + 1577496) [0x7fff5bc14218] 1-11
                          11  -[PKNFCTagReaderSession delegate] + 8 (PassKitCore + 1348766) [0x7fff5bbdc49e] 1-11
                           *11  psynch_mtxcontinue + 0 (pthread + 9627) [0xffffff800365a59b] (blocked by turnstile waiting for this thread) 1-11

8:23 - Helper Methods

extension Smoothie {
    
    enum Errors: Error {
        case noData
    }
    
    static var serverIsAvailable: Bool { false }
    static var smoothieEndpoint: URL {
        URL(string: "https://smoothies.food.com")!
    }
    
    static func fetchSynchronouslyFromServer() throws {
        fetchSmoothieLock.lock()
        defer { fetchSmoothieLock.unlock() }
        
        guard let data = performGETRequest(to: smoothieEndpoint) else {
            throw Errors.noData
        }
        
        let smoothies = try JSONDecoder().decode([Smoothie].self, from: data)
        Smoothie.all += smoothies
    }

    static func performGETRequest(to url: URL) -> Data? {
        defer { fetchSmoothieLock.unlock() }
        
        if url == smoothieEndpoint {
            fetchSmoothieLock.lock()
        }
        
        return performNetworkRequest(method: .get, url: url)
    }
}

8:43 - Update performGETRequest function

extension Smoothie {
  
    // Omitted for brevity. See previous code snippet for content.
  
    static func performGETRequest(to url: URL) -> Data? {
        return performNetworkRequest(method: .get, url: url)
    }
}