using System;

using System.Collections.Generic;

using System.Linq;

​

 public class Restaurant

{

    public long Id { get; set; }

    public string Name { get; set; }

    public DateTime CreationDate { get; set; }

    public ICollection<Review> Reviews { get; set; }

}

​

public class Review

{

    public long Id { get; set; }

    public int Mark { get; set; }

    public string Author { get; set; }

}

public class Program

{

    public static IEnumerable<Restaurant> data;

​

    public static void Main()

    {       

        OneTimeSetUp();

        TestExampleCollectionLength();

        TestOldestRestaurantName();

        TestAverageLukaszReviews();

        TestBestRestaurant();

    }

    public static void OneTimeSetUp()

    {

        data = new List<Restaurant>

            {

                new Restaurant()

                {

                    Id = 1,

                    Name = "Pizza Hut",

                    CreationDate = new DateTime(2010, 01, 01),

                    Reviews = new List<Review>()

                    {

                        new Review()

                        {

                            Id = 1,

                            Author = "Lukasz",

                            Mark = 5

                        },

                        new Review()

                        {

                            Id = 2,

                            Author = "Marek",

                            Mark = 3

                        },

                        new Review()

                        {

                            Id = 3,

                            Author = "Adam",

                            Mark = 3

                        }

                    }

                },

                new Restaurant()

                {

                    Id = 2,

                    Name = "McDonalds",

                    CreationDate = new DateTime(2015, 12, 22),

                    Reviews = new List<Review>()

                    {

                        new Review()

                        {

                            Id = 4,

                            Author = "Lukasz",

                            Mark = 3

                        },

                        new Review()

                        {

                            Id = 5,

                            Author = "Dariusz",

                            Mark = 1

                        },

                        new Review()

                        {

                            Id = 6,

                            Author = "Marcin",

                            Mark = 1

                        }

​

                    }

                },

                new Restaurant()

                {

                    Id = 3,

                    Name = "Kfc",

                    CreationDate = new DateTime(2017, 03, 10),

                    Reviews = new List<Review>()

                    {

                        new Review()

                        {

                            Id = 7,

                            Author = "Mateusz",

                            Mark = 1

                        },

                        new Review()

                        {

                            Id = 8,

                            Author = "",

                            Mark = 2

                        },

                        new Review()

                        {

                            Id = 9,

                            Author = "Tomasz",

                            Mark = 5

                        }

​

                    }

                },

            };

    }

    /// <summary>

    /// Example. How many restaurants are in dataset?

    /// </summary>

    public static void TestExampleCollectionLength()

    {

        var result = data.Count();

​

        if(result == 3)

            Console.WriteLine("TestExampleCollectionLength pass");

        else

            Console.WriteLine("TestExampleCollectionLength fail");

    }

​

    /// <summary>

    /// Which restaurant is the oldest? (please give name)

    /// </summary>

    public static void TestOldestRestaurantName()

    {

        //Code here

​

        var result = default(string);

​

        //End code

        if(result == "Pizza Hut")

            Console.WriteLine("TestOldestRestaurantName pass");

        else

            Console.WriteLine("TestOldestRestaurantName fail");

    }

​

    /// <summary>

    /// What is average score from all Lukasz reviews?

    /// </summary>

    public static void TestAverageLukaszReviews()

    {

        //Code here

​

        var result = default(double);

        //End code

​

        if(result == 4.0)

            Console.WriteLine("TestAverageLukaszReviews pass");

        else

            Console.WriteLine("TestAverageLukaszReviews fail");

    }

​

    /// <summary>

    /// Give restaurant Id with highest average mark?

    public static void TestBestRestaurant()

    {

        //Code here

​

        var result = default(long);

​

        //End code

​

        if(result == 1)

            Console.WriteLine("TestBestRestaurant pass");

        else

            Console.WriteLine("TestBestRestaurant fail");

    }

}