What is the test for a motion to appeal from a judge's order in a personal injury case?

is signed and filed and . . . constitute[s] the court's final decision on the merits. [Citations.]" (Ibid.) Thus, where it appears a trial court's order "disposes of the entire action, the order 'may be amended so as to convert it into a judgment encompassing actual determinations of all remaining issues by the trial court or, if determinable as a matter of law, by the appellate court, and the notice of appeal may then be treated as a premature but valid appeal from the judgment.' [Citations.]" (Griset v. Fair Political Practices Com'n (2001) 25 Cal.4th 688, 700, quoting Morehart v. County of Santa Barbara (1994) 7 Cal.4th 725, 740.)