How do I test async code deterministically?

        // Example of testing async code deterministically in Swift
        
        import XCTest

        class AsyncTests: XCTestCase {
            func testAsyncOperation() {
                let expectation = self.expectation(description: "Async operation completed")
                
                // Simulate an async operation
                DispatchQueue.global().async {
                    // Perform some task
                    sleep(2) // Simulating a network call
                    expectation.fulfill() // This will signal that the async operation is complete
                }
                
                // Wait for the expectation to be fulfilled, or timeout after 5 seconds
                wait(for: [expectation], timeout: 5)
            }
        }