What is the test for a claim of ineffective assistance of counsel based on a trial attorney's failure to make a motion or objection?

"A claim of ineffective assistance of counsel based on a trial attorney's failure to make a motion or objection must demonstrate not only the absence of a tactical reason for the omission [citation], but also that the motion or objection would have been meritorious if the defendant is to bear his burden of demonstrating that it is reasonably probable that absent the omission a determination more favorable to defendant would have resulted. [Citations.]" (People v. Mattson (1990) 50 Cal.3d 826, 876.)