public void Contains_Test()
        {
            IFileObject[] all    = new IFileObject[] { new PDFNumber(1), new PDFNumber(2) };
            PDFArray      target = new PDFArray(all);

            Assert.AreEqual(all[0], all[0], "Basic assertion that PDFNumbers are equal failed");

            IFileObject tofind   = all[0];
            bool        contains = target.Contains(tofind);

            Assert.IsTrue(contains);

            tofind   = all[1];
            contains = target.Contains(tofind);
            Assert.IsTrue(contains);

            tofind   = new PDFNumber(4);
            contains = target.Contains(tofind);
            Assert.IsFalse(contains);
        }