NHibernate `ISessionFactory` for in-memory SQLite.

Customer.cs

public class Customer
{
    public virtual int Id { get; set; }
    public virtual string FirstName { get; set; }
    public virtual string LastName { get; set; }
}

CustomerMap.cs

public class CustomerMap : ClassMapping<Customer>
{
    public CustomerMap()
    {
        Table("comments");
        this.Id(x => x.Id);
        Property(x => x.FirstName);
        Property(x => x.LastName);
    }
}

NHibernateConfig.cs

public class NHibernateConfig
{
    public static ISessionFactory SessionFactory()
    {
        Configuration cfg = new Configuration();
        cfg.Proxy(p => p.ProxyFactoryFactory<NHibernate.Bytecode.DefaultProxyFactoryFactory>());
        cfg.DataBaseIntegration(db =>
        {
            db.Dialect<NHibernate.Dialect.SQLiteDialect>();
            db.Driver<NHibernate.Driver.SQLite20Driver>();
//            db.ConnectionStringName = @"Data Source=:memory:; Version=3; New=True;";
//            db.ConnectionString = @"FullUri=file::memory:?cache=shared";
            db.ConnectionString = @"Data Source=:memory:; Version=3;";
            db.BatchSize = 200;
            db.LogFormattedSql = true;
            db.LogSqlInConsole = true;
            db.HqlToSqlSubstitutions = "true 1, false 0, yes 'Y', no 'N'";
        });
        cfg.SessionFactory().GenerateStatistics();

        var mapper = new ModelMapper();
        mapper.AddMappings(Assembly.GetExecutingAssembly().GetExportedTypes());
        mapper.AddMappings(typeof(Customer).Assembly.GetTypes());
        mapper.
        HbmMapping domainMapping = mapper.CompileMappingForAllExplicitlyAddedEntities();
        cfg.AddMapping(domainMapping);
        
        SchemaExport(cfg);

        return cfg.BuildSessionFactory();
    }
    
    public static void SchemaExport(Configuration config)
    {
        new SchemaExport(config).Execute(true, true, false);
    }
}