App crashes when I'm getting UNUserNotificationCenter.current() from into a Swift Package

Question

This is the context:

I'm implementing Unit Tests into an internal Swift Package. A method into one Unit Test is trying to get Notification Center reference from UNUserNotificationCenter.current() and it is crashing returning this error:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'bundleProxyForCurrentProcess is nil: mainBundle.bundleURL file:///Applications/Xcode%2014.3.1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Xcode/Agents/'.

I already made

Possible solution 1: Create a mock NotificationCenter from a protocol, which is used to extend UNUserNotificationCenter. It doesn't work, because when I want to access to method current() from variable userNotificationCenter, is not possible. Here the example.

import UserNotifications

protocol UserNotificationCenterProtocol {
    func requestAuthorization(options: UNAuthorizationOptions, completionHandler: @escaping (Bool, Error?) -> Void)
}

extension UNUserNotificationCenter: UserNotificationCenterProtocol {}

class NotificationCenterManager {
    private let userNotificationCenter: UserNotificationCenterProtocol

    init(userNotificationCenter: UserNotificationCenterProtocol = UNUserNotificationCenter.current()) {
        self.userNotificationCenter = userNotificationCenter
    }
}

class MockUserNotificationCenter: UserNotificationCenterProtocol {
    func requestAuthorization(options: UNAuthorizationOptions, completionHandler: @escaping (Bool, Error?) -> Void) {
        
    }
}

Possible solution 2: Implementing UNUserNotificationCenterDelegate's method into a class, then pass NotificationCenterDelegate to this class, but also is not possible:

class NotificationCenterMock: NSObject, UNUserNotificationCenterDelegate {
    // Some code
}

let notificationCenterMock = NotificationCenterMock()
let UNUserNotificationCenter.current().delegate = notificationCenterMock

Anyone has a solution or more ideas? Also help to know if is not possible. My theory is that is not possible to get UNUserNotificationCenter.current() for two reasons:

1. It's a Unit Test target and there aren't Notification Center in that target
2. Is not possible to get Notification Center is if a Swift Package

That are theories but I haven't found documentation that help me to prove that.

Thank you for your help!