All 7 Uses

testify
in
Killing Kennedy
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"He didn't feel like he was of any importance to them," Fain will later testify.†
p. 102.9 *

testify = provide evidence of something -- especially oral evidence in court
King's words testify that little has changed since then.†
p. 200.6
Sterling will later testify that this man is Lee Harvey Oswald.†
p. 241.5
After that, Ruby testified before the Warren Commission about the Kennedy assassination and was eventually awarded a new trial by the Texas Criminal Court of Appeals, the judge buying the argument that Ruby could not have received a fair trial in Dallas, due to the enormous publicity surrounding the shooting.†
p. 298.4

testified = provided evidence of something -- especially oral evidence in court
At the time, de Mohrenschildt had been called to testify before a congressional committee looking into the events of November 1963.†
p. 300.4

testify = provide evidence of something -- especially oral evidence in court
Giancana was due to testify before a Senate panel investigating whether the CIA and the Mafia had any ties to the murder.†
p. 300.9
Before he could testify, Giancana himself was murdered in his home on June 19, 1975.†
p. 301.1

Definitions:

(1) (testify)
provide evidence of something -- especially to say something under oath in a court of law
(2) (meaning too rare to warrant focus)