Example of infinite recursion crash when asking for URL.bookmarkData in a unit test

BookmarkDataIssueTests.swift

/// 
/// Example of infinite recursion crash when asking for URL.bookmarkData in a unit test,
/// from a non-main queue. 
///

import XCTest

class BookmarkDataIssueTests: XCTestCase {

    func testExample() throws {
        let dir = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true)
        let fileURL = dir.appendingPathComponent(UUID().uuidString)
        let fileData = "Hello, world".data(using: .utf8)!
        
        try fileData.write(to: fileURL)
        
        // This works fine
        
        do {
            let _ = try fileURL.bookmarkData()
        } catch let error {
            XCTFail("Couldn't get bookmark data: \(error)")
        }

        // This crashes inside Foundation
        
        let asyncBookmark = expectation(description: "asyncBookmark")
        DispatchQueue.global().async {
            do {
                let _ = try fileURL.bookmarkData()
            } catch let error {
                XCTFail("Couldn't get bookmark data: \(error)")
            }
            asyncBookmark.fulfill()
        }
        
        wait(for: [asyncBookmark], timeout: 10)
    }
}