What is the legal test for withdrawing as an attorney of record?

It is over inclusive because the formal act of withdrawing does not demarcate the end of the professional relationship in the context of the legal malpractice statute of limitation. "[T]he failure to formally withdraw as attorney of record, standing alone , will not toll the statute of limitations

[9 Cal.App.5th 231]

under the rubric of continued representation." (Shapero v. Fliegel (1987) 191 Cal.App.3d 842, 846, 236 Cal.Rptr. 696, italics

[215 Cal.Rptr.3d 282]