Scott Rudin has locked in his latest Broadway project, bringing famed U.K. legit collaborators Fiona Shaw and Deborah Warner back to New York with “The Testament of Mary,” a new solo play by Colm Toibin.Rudin, whose recent Main Stem credits include “The Book of Mormon” and Mike Nichols’ revival of “Death of a Salesman,” was a producer of the 2002 revival of “Medea,” the last show that brought thesp Shaw and director Warner to Broadway. As a one-actor outing with prominent collaborators, “Testament of Mary” recalls Rudin’s 2007 offering “The Year of Magical Thinking,” which toplined Vanessa Redgrave performing a monologue by Joan Didion. Highly regarded legiters Warner and Shaw — the actress whose pop culture profile has been upped by notable gigs in the “Harry Potter” films and a recent season of “True Blood” — have worked together for some 15 years on projects including their lauded staging of T.S. Eliot’s “The Waste Land” (which played Off Broadway in 1996) and a revival of “Happy Days” (seen at the Brooklyn Academy of Music in 2008). Irish novelist Toibin (“The Blackwater Lightship,” “The Master,” “Brooklyn”) first penned “Testament” as a monologue that bowed in Dublin in 2011 before the scribe turned it into a 2012 novella. Shaw will play Mary, the mother of Jesus, who tells her own story in the aftermath of her son’s crucifixion. Along with Warner, the creative team of the world preem will include set designer Tom Pye (“All My Sons,” “Top Girls”) and lighting designer Jennifer Tipton. “Testament of Mary” will play a 12-week run at the Walter Kerr Theater, the Broadway venue where Jessica Chastain starrer “The Heiress” ends its limited run Feb. 10. “Testament” begins previews March 26 ahead of an April 22 opening.