public async Task LoadApartComplexDataHtml()
        {
            // Arrange
            var apartComplexHtmlNode = HtmlNode.CreateNode(_htmlApartComplexLiteral);
            var loadHtmlNodesTask    = Task.Run(() => new HtmlNodeCollection(null)
            {
                apartComplexHtmlNode
            });

            var htmlParser = new Mock <HtmlParser>(new HtmlWeb());

            htmlParser
            .Setup(htmlParser => htmlParser.LoadHtmlNodes(_homePageUrl, _apartComplexGroupXPath))
            .Returns(loadHtmlNodesTask);

            var expectedResult = new HtmlNodeCollection(null)
            {
                apartComplexHtmlNode
            };
            var pageHandler = new PageHandler(htmlParser.Object);

            // Act
            var actualResult = await pageHandler.LoadApartComplexDataHtml();

            // Assert
            Assert.Equal(expectedResult, actualResult);
        }