What is the test for cross-examination of an expert in a medical malpractice case?

We can only call this another disingenuous argument. Code of Civil Procedure section 2034.260, subdivision (a) requires an exchange of expert witness information. Subdivision (c) of that statute also requires, in certain contexts, that the list be accompanied by a declaration containing a statement of qualifications of the expert and "[a] brief narrative statement of the general substance of the testimony that the expert is expected to give." (Code Civ. Proc., 2034.260, subd. (c)(2).) "Only by such a disclosure will the opposing party have reasonable notice of the specific areas of investigation by the expert, the opinions he has reached and the reasons supporting the opinions, to the end the opposing party can prepare for cross-examination and rebuttal of the expert's testimony." (Kennemur v. State of California, supra, 133 Cal.App.3d at p. 919.)