What is the test for showing intent in a criminal case?

"'To be admissible to show intent, "the prior conduct and the charged offense need only be sufficiently similar to support the inference that defendant probably harbored the same intent in each instance."' [Citations.] To be admissible to show a common scheme or plan, a greater degree of similarity is required than to show intent, and 'the common features must indicate the existence of a plan rather than a series of similar spontaneous acts, but the plan thus revealed need not be distinctive or unusual.' [Citation.]" (People v. Davis (2009) 46 Cal.4th 539, 602.)