What is the test for a cause of action under the California Anti-SLAPP Act?

"[T]he statutory phrase 'cause of action . . . arising from' means simply that the defendant's act underlying the plaintiff's cause of action must itself have been an act in furtherance of the right of petition or free speech. [Citation.] In the anti-SLAPP context, the critical point is whether the plaintiff's cause of action itself was based on an act in furtherance of the defendant's right of petition or free speech. [Citations.]" (City of Cotati v. Cashman (2002) 29 Cal.4th 69, 78.) Stated another way, "it is the principal thrust or gravamen of the plaintiff's cause of action that determines whether the anti-SLAPP statute applies [citation], and when the allegations referring to arguably protected activity are only incidental to a cause of action based essentially on nonprotected activity, collateral allusions to protected activity should not subject the cause of action to the anti-

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