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Discover LudwigThe phrase "testified on" is correct and usable in written English
It has the same meaning as "testified about" or "testified regarding" and can be used to describe a situation where someone gave evidence or a statement about a particular topic or issue. For example: "The witness testified on the suspect's whereabouts at the time of the crime."
Exact(58)
In a neat twist, among those who testified on his behalf was one Richard M Nixon.
After one of those arrests, Ms. DeCurtis testified on Tuesday, "everybody just stood up and applauded".
Mr. Amaral testified on three occasions, sometimes saying there was one gunman, and sometimes two.
The priest later testified on his behalf.
McQueary's father also testified on Friday.
Mr. Cernan also testified on Wednesday.
Three psychologists testified on Gross's behalf.
At the trial, she testified on behalf of the defense.
Another amputee, Marc Fucarile, testified on Thursday from a wheelchair.
A pair of new witnesses testified on Hennis's behalf.
In court, they testified on the couple's behalf.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com