Notes posted to RSpec

Examples

see have_at_least or have

usage

code

@items = Item.find(:all)
@items.should have_at_least(1).item

Example using simple_matcher

This is extracted from: http://blog.davidchelimsky.net/2008/6/7/thoughts-on-the-dance-off

Here’s an example:

def be_sorted
  simple_matcher("a sorted list") {|actual| actual.sort == actual}
end
[1,2,3].should be_sorted

The block is handed the actual value. If the block returns true, the expectation passes. If it returns false, it fails with the following message:

expected “a sorted list” but got [1, 3, 2]

If you say [1,2,3].should_not be_sorted you’d get this message instead=:

expected not to get “a sorted list”, but got [1, 2, 3]

As of now, you don’t get any control over the failure message other than the string you pass to the simple_matcher method

anything matcher

The anything matcher will match any ruby object:

1.should == anything
nil.should == anything
'string'.should == anything

var.should_receive(:method).with(param1, anything)

Testing an options hash receives certain parameters

This method is very useful for testing methods that use the ruby idiom of accepting a hash with configurable options.

class Example
  def self.find(options = {})
    ...
  end
end

We can use hash_including to ensure that certain options are passed in when mocking it.

Example.should_receive(:find).with(hash_including(:conditions => 'some conditions'))

Example.find(:conditions => 'some_conditions', :order => 1)
# => Passes expectation

Example.find(:order => 1)
# => Fails expectation

This can also be used to great effect with the anything matcher. For example:

hash_including(:key => anything)

hash_including(anything => 'value')