What is the legal test for a motion to vacate or confirm an award made by an arbitrator at an arbitration?

"In general, we agree with those courts which have enunciated the principle that the preferred procedure in arbitration proceedings is to proceed with the arbitration and attack the intermediate rulings in connection with a petition to vacate or confirm the arbitrator's award or on appeal from a judgment confirming the award." (International Film Investors v. Arbitration Tribunal of Directors Guild (1984) 152 Cal.App.3d 699, 706, 199 Cal.Rptr. 690.)