testimonial
/ˌtɛstəˈmoʊnijəl/
noun
plural -als
[count] a written or spoken statement in which you say that you used a product or service and liked it
Testimonials are often used to sell the products or services they are about.
a written or spoken statement that praises someone's work, skill, character, etc.
an event at which someone is honored
testament
+ to
adjective
relating to testimony and especially to legal testimony