Setting up test relations

public sealed class User : IdentityUser<int>
{
    public string? Bio { get; set; } = string.Empty;
    public int Age { get; set; } = 0;

    public int ProfilePictureId { get; set; } = 0;
    public string ProfilePictureUrl { get; set; } = string.Empty;

    public ICollection<Dog> Dogs { get; set; } = [];

    public void GenerateDogs(int count)
    {
        int idx = 1000;
        var dogFaker = new Faker<Dog>()
           .RuleFor(d => d.Id, f => idx += 1)
           .RuleFor(d => d.Name, f => f.Name.FirstName())
           .RuleFor(d => d.Breed, f => f.PickRandom(new[] { "Beagle", "Bulldog", "Poodle", "German Shepherd" }))
           .RuleFor(d => d.DateOfBirth, f => f.Date.Past(10).ToUniversalTime().ToDateTimeOffset())
           .RuleFor(d => d.Color, f => f.Commerce.Color())
           .RuleFor(d => d.IsNeutered, f => f.Random.Bool(0.7f))
           .RuleFor(d => d.Notes, f => f.Lorem.Sentence())
           .RuleFor(d => d.UserId, f => f.PickRandom(_users).Id)

        _dogs = dogFaker.Generate(count);
    }