What is the test for determining whether a defendant is competent to stand trial?

"Under section 1368, subdivision (a), a judge must state on the record any doubt that arises in her mind as to the mental competence of the defendant, and either seek defense counsel's opinion as to the defendant's mental competency, or appoint counsel if the defendant is unrepresented. The decision whether to order a competency hearing rests within the trial court's discretion, and may be disturbed upon appeal 'only where a doubt as to [mental competence] may be said to appear as a matter of law or where there is an abuse of discretion.' [Citation.] When the court is presented with 'substantial evidence of present mental incompetence,' however, the defendant is 'entitled to a section 1368 hearing as a matter of right.' [Citation.] On review, our inquiry is focused not on the subjective opinion of the trial judge, but rather on whether there was substantial evidence raising a reasonable doubt concerning the defendant's competence to stand trial. [Citation.] Evidence may be substantial even where it is contested or presented by the defense. [Citation.] A trial court reversibly errs if it fails to hold a competency hearing

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when one is required under the substantial evidence test." (People v. Mickel (2016) 2 Cal.5th 181, 194-195.)