The phrase "are testifying for" is correct and usable in written English.
It can be used when referring to individuals or groups who are providing evidence or statements in support of a cause, person, or organization, typically in a legal or formal context.
Example: "The witnesses are testifying for the defense in the trial."
Alternatives: "are providing testimony for" or "are speaking on behalf of".
Cycling at 55 °C, capacity retention of 81.2% and 72% at the end of 200 cycles for 1C and 10C discharge rates respectively are testified for the electrochemical stability.
He was testifying for a second day in the trial of Mr. Kozlowski and a former chief financial officer, Mark H. Swartz.
Among them was a discussion between Mr. Rajaratnam and Rajiv Goel, a former Intel executive, who has also pleaded guilty and is testifying for the government.
On Monday, four senior police officers, who were testifying for the prosecution, contradicted previous statements that Mr. Mubarak had ordered the use of live ammunition against demonstrators.
Clinton flew to Washington for his Oval Office address as Ms. Lewinsky was testifying for a second time before the grand jury here.
"You knew full well he couldn't even run any machines?" Gerald Shargel, a defense lawyer, asked the former official, Joseph Coriasco, who was testifying for the government.
He noted that while he was testifying for the government last week, prosecutors back in Turkey ordered the seizure of his assets and those of nearly 20 other people.
A full day of testimony in the third day of a trial against BP was dominated by the witness, Alan R. Huffman, a petroleum geophysicist who was testifying for the government and private plaintiffs.
The trial of the defendant, Vincent Basciano, who is charged with ordering the 2004 murder of a fellow mobster, Randolph Pizzolo, has gained widespread attention because a former leader of the Bonanno family, Joseph C. Massino, has been testifying for the government.
Mr. Benjamin, who was testifying for the prosecution under a grant of immunity, and Mr. Williams had played together on the Nets for two years in the mid-1990s, before a severe leg injury ended Mr. Williams's professional career in 2000.
