FastClock returns fake clock with very fast time speed advanced until end of test the clock stops advance at end of test.

SpinWaitCondition wait while cond return true with check it in loop l can be nil - then locker use for check conditions.

SpinWaitConditionWithTimeout wait while cond return true with check it in loop l can be nil - then locker use for check conditions.

SpinWaitProgress failed if result of progress func no changes without timeout.

GrpcLogger use for log raw grpc messages Usage: db, err := ydb.Open(context.Background(), connectionString, ..