[rspec-devel] [ rspec-Feature Requests-10133 ] custom predicate matchers

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Feature Requests item #10133, was opened at 2007-04-16 10:30
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http://rubyforge.org/tracker/?func=detail&atid=3152&aid=10133&group_id=797

Category: expectation module
Group: None
Status: Open
Priority: 3
Submitted By: David Chelimsky (dchelimsky)
Assigned to: David Chelimsky (dchelimsky)
Summary: custom predicate matchers

Initial Comment:
RSpec <= 0.8 let you do this:

  obj.should_predicate

For example:

  obj.should_exist

which would pass if obj.exist? returns true.

In RSpec 0.9, there is no underscore-less parallel:

  obj.should exist

This was excluded deliberately because when RSpec does not find the #exist method there are more than one reason that it might be missing: it could be a helper method that hasn't been written yet OR it could be a predicate on obj that hasn't been written yet.

I still think this is the correct decision, however, the following would support easy creation of custom predicate matchers:

Spec::Runner.configure do |config|
  config.predicate_matchers :exist
end

and/or

describe Thing do
  predicate_matchers :exist
  it "should exist" do
    Thing.new.should exist
  end
end

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You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=3152&aid=10133&group_id=797