What is the test for appeal from a preliminary injunction for abuse of discretion?

We review an order granting a preliminary injunction for abuse of discretion. (Hunter v. City of Whittier (1989) 209 Cal.App.3d 588, 595, 257 Cal.Rptr. 559.) "Ordinarily an appeal from the granting of a preliminary injunction involves a very limited review of the [superior court's] exercise of discretion concerning two factors: (1) the likelihood that plaintiffs will ultimately prevail and (2) the interim harm plaintiffs will sustain if the preliminary injunction is denied compared to the interim harm defendant will suffer if the injunction is granted pending a final determination of the merits." (Ibid.) Thus, an appellate decision usually does not constitute a final adjudication of the ultimate rights in controversy; it merely determines whether the superior court abused its discretion based on the record before it at the time of the ruling.