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"testify on" is correct and usable in written English.
You can use it when you want to express the idea of giving, providing, or speaking testimony about a particular thing. For example: "The witness will testify on the events that transpired during the accident."
Exact(59)
The second is to testify on Thursday.
Mr. Ruff will testify on Monday.
Mr. Clarke is to testify on Wednesday.
Mr. Martin planned to testify on the man's behalf.
His son James was set to testify on Tuesday.
Mr. Cassano is scheduled to testify on Tuesday.
Several traders from that group will testify on Tuesday.
Others preferred to testify on audiotape, with their voices disguised.
Forensic experts are expected to testify on Tuesday.
Mr. Weberman's accuser is expected to testify on Tuesday.
Executives of both banks are expected to testify on Tuesday.
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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