sample_class_to_test.swift

import Foundation
import RealmSwift

class FooObject {
    let context: StorageContext
    
    init(context: StorageContext) {
        self.context = context
    }
    
    func dummyMethod(completion: @escaping ((Bool) -> Void)) {
        self.context.fetch(Object.self, predicate: nil, sorted: nil) { (objects) in
        
            (objects.count > 10) ? completion(true) : completion(false)
            
        }
    }
}