protestation vs testimony

protestation

noun
  • A declaration in common-law pleading, by which the party interposes an oblique allegation or denial of some fact, protesting that it does or does not exist, and at the same time avoiding a direct affirmation or denial. 

  • a formal solemn objection or other declaration 

testimony

noun
  • Witness; evidence; proof of some fact. 

  • Statements made by a witness in court. 

  • In a church service (or religious service), a personal account, such as one's conversion, testimony of faith, or life testimony. 

  • An account of first-hand experience. 

How often have the words protestation and testimony occurred in a corpus of books? (source: Google Ngram Viewer )