public List <HNPost> GetPostsData(int numberOfPosts)
{
HtmlDocument doc = _htmlRetriever.GetHtmlDocument();
//Searching for a <tr> with a class name 'athing'
string nodeQueryString = "//tr[@class='" + _HNPostClassName + "']";
//Creates list of the <tr> elements that contains the rank, title and Url of Posts
HtmlNodeCollection postTitleRows = doc.DocumentNode.SelectNodes(nodeQueryString);
for (int i = 0; i < numberOfPosts; i++)
{
HNPost post = new HNPost();
//<td> elements within the title <tr> element for the rank and title
HtmlNode postTitleCell = postTitleRows[i].ChildNodes[4];
HtmlNode postRankCell = postTitleRows[i].ChildNodes[1];
post.Title = postTitleCell.InnerText;
post.Rank = int.Parse(postRankCell.FirstChild.InnerText.TrimEnd(new char[] { '.' }));
//<a> element within the title <td> element for the Url
post.Uri = postTitleCell.ChildNodes[0].Attributes.AttributesWithName("href").ToList()[0].Value;
if (post.Rank != i + 1)
{
throw new HtmlWebException("Post rank does not match post order");
}
// Subtext <tr> element after the title <tr> that contains the author, points and comments
HtmlNode postSubtextRow = postTitleRows[i].NextSibling;
//<td> subtext element within subtext <tr>
HtmlNode postSubtextCell = postSubtextRow.ChildNodes[1];
post.Points = int.Parse(postSubtextCell.ChildNodes[1].InnerText.Split(" ")[0]);
post.Author = postSubtextCell.ChildNodes[3].InnerText;
int comments;
if (int.TryParse(postSubtextCell.ChildNodes[11].InnerText.Split(" ")[0], out comments))
{
post.Comments = comments;
}
//If there are no comments
else if (postSubtextCell.ChildNodes[11].InnerText == "discuss")
{
post.Comments = 0;
}
_HNPosts.Add(post);
}
ValidateHNPostList(_HNPosts);
return(_HNPosts);
}
public void RankCannotBeNegative()
{
// ARRANGE: create a post with minus Rank
var post = new HNPost {
Rank = -1
};
var validator = new HNPostValidator(HNPage.BASE_URI);
// ACT: run the validator on the post
validator.ValidatePost(post);
// ASSERT: the post should contain a validation error
Assert.NotNull(post.ValidationErrors);
Assert.True(post.ValidationErrors.Where(e => e.MemberNames.Contains("Rank")).Any());
}
public void UriIsAValidUri()
{
// ARRANGE: create a post with invalid Uri
var post = new HNPost {
Uri = "httppp:/notvalid"
};
var validator = new HNPostValidator(HNPage.BASE_URI);
// ACT: run the validator on the post
validator.ValidatePost(post);
// ASSERT: the post should contain a validation error
Assert.NotNull(post.ValidationErrors);
Assert.True(post.ValidationErrors.Where(e => e.MemberNames.Contains("Uri")).Any());
}
public void AuthorCannotBeEmptyString()
{
// ARRANGE: create a post with empty string author
var post = new HNPost {
Author = ""
};
var validator = new HNPostValidator(HNPage.BASE_URI);
// ACT: run the validator on the post
validator.ValidatePost(post);
// ASSERT: the post should contain a validation error
Assert.NotNull(post.ValidationErrors);
Assert.True(post.ValidationErrors.Where(e => e.MemberNames.Contains("Author")).Any());
}
public void TitleCannotBeOver256Chars()
{
// ARRANGE: create a post with Title 257 chars long
var post = new HNPost {
Title = new string('a', 257)
};
var validator = new HNPostValidator(HNPage.BASE_URI);
// ACT: run the validator on the post
validator.ValidatePost(post);
// ASSERT: the post should contain a validation error
Assert.NotNull(post.ValidationErrors);
Assert.True(post.ValidationErrors.Where(e => e.MemberNames.Contains("Title")).Any());
}
