DbContext.cs

public class Product
{
    public string Sku { get; set; }
    public int Received { get; set; }
    public int Shipped { get; set; }
}

public class ProductDbContext : DbContext
{
    public DbSet<Product> Products { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        modelBuilder.Entity<Product>().HasKey(x => x.Sku);
    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        base.OnConfiguring(optionsBuilder);
        optionsBuilder.UseInMemoryDatabase("Demo");
    }
}