CQRS.Tests.TemporaryLocalDbManager.ManagerDbExists C# (CSharp) Метод

        private bool ManagerDbExists()
        {
            if(!ConnectionStringsWithKnownManagerDb.Contains(_masterConnectionString))
            {
                if(_masterConnection.ExecuteScalar($"select DB_ID('{ManagerDbName}')") == DBNull.Value)
                {
                    return false;
                }
            }

            ConnectionStringsWithKnownManagerDb.Add(_masterConnectionString);           
            return true;
        }