public void GetEnumerator_Author()
 {
     using (var enumerator = new Authors(AuthorName, AuthorStringNameEmail).GetEnumerator())
     {
         Assert.IsTrue(enumerator.MoveNext());
         Assert.AreEqual(AuthorName, enumerator.Current);
         Assert.IsTrue(enumerator.MoveNext());
         Assert.AreEqual(AuthorStringNameEmail, enumerator.Current);
         Assert.IsFalse(enumerator.MoveNext());
     }
 }