What should break the test?

Development , 0 Comment

I recently came across FakeFS, which sounds like a great idea for helping to test file functions. However, I did pick up on the following off the website:

[...] it means replacing our mkdir call with a call to mkdir_p won’t break our tests. Because, really, it shouldn’t.

Now I understand that in the context of the example given, mkdir and mkdir_p should do the same thing. But mkdir and mkdir_p do perform different operations, and the tests should break if mkdir_p is changed to mkdir. If you change mkdir_p to mkdir and your passing tests don’t fail then your tests aren’t correct.

 

Squirrel and the custom nut matcher

Development, Ruby on Rails , , , 2 Comments

I recently found squirrel, and I wanted to use it for a project we’re working on to simplify some complex finder statements. Squirrel allows turning something like this:

Task.find(:all,
  :conditions => [
    'active = ? and (updated_at > cache_version or cache_version IS NULL)', true
  ]
)

into:

Task.find(:all) do
  active == true
  any do
    updated_at > cache_version
    cache_version.nil?
  end
end

The problem is testing

Then I ran into a serious problem – how to test this piece of code using rspec? Here was my first attempt: (more…)