What is the test for a motorist who fails to properly signal a left turn?

As the court stated in People v. Miranda: "Turning to the facts here, it is undisputed that [the officer] observed [the defendant] commit a moving traffic violation. Thereafter his conduct remained reasonably related to the duties incident to the stop, especially when [the defendant] informed him that her driver's license was suspended. Defendant does not claim otherwise. [] . . . [] Defendant notes that [the officer] did not testify that [the defendant]'s unsignalled left turn was actually unsafe or that there was any other traffic around. That [the defendant] might not have been driving in an obviously dangerous manner is irrelevant. Under Vehicle Code section 22107, the failure to properly signal where another 'may be affected by the movement' is prima facie unsafe, for it creates the possible danger the statute was designed to prevent. Moreover,

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defendant is mistaken that there was no other traffic around. [The officer] was behind [the defendant], and the primary benefit of the signal requirement is for the vehicles to the rear of the signalling vehicle." (People v. Miranda, supra, 17 Cal.App.4th at p. 930.)