test: do InsertOnInstances in parallel

Author: elhimov

test_helpers/pool_helper.go

@@ -181,16 +181,21 @@ func InsertOnInstances(
 		return fmt.Errorf("fail to set roles for cluster: %s", err.Error())
 	}
 
-	for _, dialer := range dialers {
-		ctx, cancel := GetConnectContext()
-		err := InsertOnInstance(ctx, dialer, connOpts, space, tuple)
-		cancel()
-		if err != nil {
-			return err
-		}
+	ctx, cancel := GetConnectContext()
+	defer cancel()
+
+	errs := make([]error, len(dialers))
+	var wg sync.WaitGroup
+	wg.Add(len(dialers))
+	for i, dialer := range dialers {
+		go func(i int, dialer tarantool.Dialer) {
+			defer wg.Done()
+			errs[i] = InsertOnInstance(ctx, dialer, connOpts, space, tuple)
+		}(i, dialer)
 	}
+	wg.Wait()
 
-	return nil
+	return errors.Join(errs...)
 }
 
 func SetInstanceRO(ctx context.Context, dialer tarantool.Dialer, connOpts tarantool.Opts,