The phrase "in a testament" is correct and usable in written English.
It may be used to indicate a solemn declaration or verdict. For example, "the minister spoke with conviction, her words ringing true in a testament to her faith."
Scholars debate the origin of the term Usonian, but Wright wrote in "A Testament," published in 1957, "I have often used this word when needing reference to our country or style".
Swedish actress Vikander (most recently seen playing Vera Brittain in A Testament Of Youth) trained as a dancer.
In a testament to the proclivities of the store's clientele, it's not the only bejeweled ode to grass on display.
But in a testament to the town's musical resilience, the night life simply migrated over to the main square.
That broke the spine of the Western capitalist regime," he said, in a testament to his own delusions.
Still, in a testament to Mr. Diller's reputation, even that relatively minor deal drew substantial attention in the news media.
In a testament to the growing strength of Dominican voters, the Democrat, H. Carl McCall, had apologized by day's end.
In 2009, in a testament to its enduring appeal, StriVectin was still one of the fastest growing anti-aging brands, according to NPD Group, a market research firm.
In a testament to Albany's perversion, Mr Spitzer, a Democrat, wants to rein in costs; the Republican-led Senate, backed by the health-care lobby, does not.
In a testament to Newman's likability, moviegoers embraced the character, much to the surprise of the actor, who received his third Oscar nomination.
In a testament to their commanding new reach, D.J.'s like Kaskade can earn $200,000 or more for a single night, according to handlers and public records.
