What is the test for instructing a jury on a self-defense defense?

"'"It is settled that in criminal cases, even in the absence of a request, a trial court must instruct on general principles of law relevant to the issues raised by the evidence"' and '"necessary for the jury's understanding of the case."' [Citations.] It is also well settled that this duty to instruct extends to defenses 'if it appears ... the defendant is relying on such a defense, or if there is substantial evidence supportive of such a defense and the defense is not inconsistent with the defendant's theory of the case.' [Citations.]" (People v. Brooks (2017) 3 Cal.5th 1, 73.)

"A trial court is required to instruct sua sponte on any defense, including self-defense, only when there is substantial evidence supporting the defense, and the defendant is either relying on the defense or the defense is not inconsistent with the defendant's theory of the case. [Citation.]" (People v. Villanueva (2008) 169 Cal.App.4th 41, 49.) Substantial evidence is "'evidence which is reasonable, credible, and of solid value'" (People v. Shelmire (2005) 130 Cal.App.4th 1044, 1055, quoting

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