What is the legal test for a jury to determine whether there is sufficient evidence of premeditation and deliberation for a completed first degree murder?

"We do not distinguish between attempted murder and completed first degree murder for purposes of determining whether there is sufficient evidence of premeditation and deliberation." (People v. Herrera (1999) 70 Cal.App.4th 1456, 1462, fn. 8, disapproved on another ground in People v. Mesa (2012) 54 Cal.4th 191, 199.) " ' "In this context, 'premeditated' means 'considered beforehand,' and 'deliberate' means 'formed or arrived at or determined upon as a result of careful thought and weighing of considerations for and against the proposed course of action.' " ' [Citation.] ' "An intentional killing is premeditated and deliberate if it occurred as the result of preexisting thought and reflection rather than unconsidered or rash impulse." ' [Citations.] 'The true test is not the duration of time as much as it is the extent of the reflection. Thoughts may follow each other with great rapidity and cold, calculated judgment may be arrived at quickly . . . .' " (People v. Potts (2019) 6 Cal.5th 1012, 1027.)