"was testified to" is correct and usable in written English.
You can use it when you are describing something that was stated under oath in a court of law. For example: "It was testified to under oath that the defendant had committed the crime."
The model was testified to its feasibility and rationality by a practical illustrative example.
Also, this method was testified to be effective at the conditions with the attack angle from −12° to +9°.
Polysaccharide was testified to be the main component of Flammulina velutipes for inhibiting AChE activity in our preliminary study.
Also, by comparing with existing models, the developed model was testified to be more effective for asphalt pavements with thick asphalt layer, promising the model's potential use.
Moreover, Congress clearly understood that even when the government is targeting foreign persons for collection, communications of US persons may be acquired if those persons are in communication with the foreign targets, for example as was testified to in today's hearing when Najibullah Zazi communicated with a foreign terrorist whose communications were being targeted under Section 702.
The substance existing in the washing liquor of CSPBs was testified to be p-DMDAAC.
He was testifying to a Senate foreign relations panel today, shortly after the sanctions vote.
As Mr. Bush was speaking, Mr. Cooper was testifying to the federal grand jury.
He was testifying to his deep love of the beautiful sacred music produced by his ancestors.
On the radio Mark Zuckerberg was testifying to Congress about the Cambridge Analytica scandal.
That hasn't been testified to here.
