Argument Constraints where the Argument is a Hash

Testing RSpec
1

Hi folks,

I have an object whose constructor I want to stub, specifying that it
should be passed a hash containing an expected set of key / value pairs.

Note that the actual hash might contain more key / value pairs, but I
don’t care, as long as my expected ones are there

I thought I might be able to write this:

       expected_params = {
         :page => "1",
         :city_id => city.id.to_s,
         :name => "thingy" }

Venue::Query.should_receive(:new).with( include
(expected_params) ).and_return(query)

… but it doesn’t seem to work.

What’s my best approach?

Thanks for your patience and support as I get up to speed with this
stuff folks. You’re all very kind!

cheers,
Matt

http://blog.mattwynne.net

In case you wondered: The opinions expressed in this email are my own
and do not necessarily reflect the views of any former, current or
future employers of mine.

2

Okay, I realised the with() is calling the == method on whatever you
pass in, so I did this:

   module EquateAnyHashContainingAllMyElements
     def ==(other)

       self.keys.all? do |key|
         other.has_key?(key)
       end

     end
   end

…

       expected_params = {
         :page => "1",
         :city_id => city.id.to_s,
         :name => name_filter }

       expected_params.extend(EquateAnyHashContainingAllMyElements)

       Venue::Query.should_receive(:new).with

( expected_params ).and_return(query)

Thoughts? Is there a neater way to do this? Be as brutal as you
like … :wink:

cheers,
Matt

http://blog.mattwynne.net

In case you wondered: The opinions expressed in this email are my own
and do not necessarily reflect the views of any former, current or
future employers of mine.

3

On Aug 18, 2008, at 11:10 AM, Matt W. [email protected] wrote:

      expected_params = {
        :page => "1",
        :city_id => city.id.to_s,
        :name => "thingy" }

Venue:
:Query.
should_receive(
:new).with( include(expected_params) ).and_return(query)

Close …

…with( hash_including(expected_params).and…

Cheers,
David