Here you go, testimony re the gold books of Mormon
found by Joseph Smith
Be it known unto all nations, kindreds, tongues, and people, unto whom this work shall come: That Joseph Smith, Jun., the translator of this work, has shown unto us the plates of which hath been spoken, which have the appearance of gold; and as many of the leaves as the said Smith has translated...
www.churchofjesuschrist.org
Yep, that is an example. After reading the testimony of those witnesses, a judicious person would examine the details of the testimony, read statements by other witmesses - including even character witnesses, examine material evidence such as the translation itself, and whatever else, perhaps the hat Joseph Smith peered into. Then judgment would come. Truth would be identified, e.g. "the appearance of gold", "plates" of some sort, possibly also bowls, the responsibility of Joseph Smith - "translator" or in the first edition "author", and so on.
A bloody knife lying on the chest of a man who bled to death is evidence, even if it turns out that it was not his blood on the knife and he had not been stabbed. On the other hand, if he was stabbed and it is his blood, that piece of evidence is more pertinent. But pertinent or not, it is evidence. The testimony of a witness is evidence, its pertinence to be determined.
Myself, I would be unhappy to hear that criminal trials no longer allow the testimony of witnesses to determine whether a crime has been committed, what the crime was, and who committed the crime.
Without that single young witness that escaped his efforts, Ted Bundy would still be killing.
If the judicial system adopted your mistaken belief that a testimony is not evidence, what a catastrophe that would be for victims of crime and of social order.