public void TestSetGetString(string key, string value)
        {
            var sut = new CustomDataMap();

            sut.SetString(key, value);

            Check.That(sut.GetString(key)).IsEqualTo(value);
        }
        public void TestNullKeyNotAllowed()
        {
            var sut = new CustomDataMap();

            Check.ThatCode(() => sut.SetString(null, default)).Throws <ArgumentNullException>();
            Check.ThatCode(() => sut.SetBool(null, default)).Throws <ArgumentNullException>();
            Check.ThatCode(() => sut.SetLong(null, default)).Throws <ArgumentNullException>();
            Check.ThatCode(() => sut.SetULong(null, default)).Throws <ArgumentNullException>();
            Check.ThatCode(() => sut.SetXElement(null, default)).Throws <ArgumentNullException>();
            Check.ThatCode(() => sut.GetString(null)).Throws <ArgumentNullException>();
            Check.ThatCode(() => sut.GetBool(null, default)).Throws <ArgumentNullException>();
            Check.ThatCode(() => sut.GetLong(null, default)).Throws <ArgumentNullException>();
            Check.ThatCode(() => sut.GetULong(null, default)).Throws <ArgumentNullException>();
            Check.ThatCode(() => sut.GetXElement(null, default)).Throws <ArgumentNullException>();
        }