[#4] In Article: Added spaces between defs. Used more compact variable assignment.
[#5] In ArticleManager. Removed useless comment. Added spaces between defs. Changed block variables names to something more meaningful.
[#6] In MockArticle. Added spaces between defs.
[#9] In TestArticle. Added empty lines between defs.
[#10] In TestArticleManager. Added empty lines between defs.
[#11] In TestMockArticle. Added empty lines between defs.