"vivid testimony" is a correct and usable phrase in written English.
It is often used to describe an instance when something is described in a particularly vivid or memorable way, usually by a witness in a court case. For example: "The witness provided vivid testimony of the crime, clearly remembering every detail."
To that end he provides vivid testimony.
They offer vivid testimony about the alterations in our world.
Rebecca West wrote that it was "a vivid testimony".
During Mr. Winkler's vivid testimony, his wife, June, wept silently among the spectators, sometimes doubled over.
As the images of tiny white coffins and vivid testimony from survivors went around the world, tragedy struck again.
Large liability awards tend to go to people who are severely injured but survive to provide vivid testimony.
Kim Willsher heard vivid testimonies from veterans at Pegasus Bridge.
But I carry vivid testimonies written and spoken by Khotyn's survivors, a guidebook from another era.
Michael Morpurgo will read passages from his books, War Horse and Private Peaceful, and in combination with the musical performances and vivid testimonies, pay tribute to people whose lives were so greatly affected by a terrible conflict.
Judging by the former F.B.I. director James Comey's vivid sworn testimony before the Senate Intelligence Committee regarding the President's inappropriate conversations with him, it would seem almost certain that Trump has had similarly ill-considered discussions with others.
Dermot Bolger's resistance to postcolonial strictures about subjects and approaches accompanied characteristically generous editorial activism, as the writer's remarks were the introduction to his groundbreaking 1992 anthology of contemporary fiction a vivid literary testimony to his wisdom.
