How do I stub things in MiniTest?

Question

Within my test I want to stub a canned response for any instance of a class.

It might look like something like:

Book.stubs(:title).any_instance().ret         


        

Answer 1

You can easily stub class methods in MiniTest. The information is available at github.

So, following your example, and using the Minitest::Spec style, this is how you should stub methods:

# - RSpec -
Book.stubs(:title).any_instance.returns("War and Peace")

# - MiniTest - #
Book.stub :title, "War and Peace" do
  book = Book.new
  book.title.must_equal "War and Peace"
end

This a really stupid example but at least gives you a clue on how to do what you want to do. I tried this using MiniTest v2.5.1 which is the bundled version that comes with Ruby 1.9 and it seems like in this version the #stub method was not yet supported, but then I tried with MiniTest v3.0 and it worked like a charm.

Good luck and congratulations on using MiniTest!

Edit: There is also another approach for this, and even though it seems a little bit hackish, it is still a solution to your problem:

klass = Class.new Book do
  define_method(:title) { "War and Peace" }
end

klass.new.title.must_equal "War and Peace"