Sorted:

problem about lsp-Collection of common programming errors

problem about learn-ruby-the-hard-way-Collection of common programming errors

problem about class-variables-Collection of common programming errors

Why is my test double not expecting the command I allowed?-Collection of common programming errors

Dealing with a non-ascii character in Rspec Testing-Collection of common programming errors

How do I get the <p> tag parent class name using Nokogiri?-Collection of common programming errors

Marshal not serializing or deserializing nested serialized attributes properly-Collection of common programming errors

Confusion with super-Collection of common programming errors

Scope of class variable-Collection of common programming errors

Rails 4 + Devise – User.find_by problems-Collection of common programming errors