public void Clone()
        {
            ICloneable authors = new Authors(AuthorStringNameEmailHomepage, AuthorName, AuthorStringNameEmail);

            if (authors.Clone() is Authors clone)
            {
                Assert.IsTrue(AuthorStringNameEmailHomepage == clone[0]);
                Assert.IsTrue(AuthorName == clone[1]);
                Assert.IsTrue(AuthorStringNameEmail == clone[2]);
            }
            else
            {
                Assert.Fail($"{nameof( clone )} is not an instance of Authors.");
            }
        }