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Spec::Example::PredicateMatchers

Public Instance Methods

predicate_matchers[matcher_name] = method_on_object predicate_matchers[matcher_name] = [method1_on_object, method2_on_object] click to toggle source

Dynamically generates a custom matcher that will match a predicate on your class. RSpec provides a couple of these out of the box:

  exist (for state expectations)
    File.should exist("path/to/file")

  an_instance_of (for mock argument matchers)
    mock.should_receive(:message).with(an_instance_of(String))

Examples

  class Fish
    def can_swim?
      true
    end
  end

  describe Fish do
    predicate_matchers[:swim] = :can_swim?
    it "should swim" do
      Fish.new.should swim
    end
  end
    # File lib/spec/example/predicate_matchers.rb, line 32
32:       def predicate_matchers
33:         @predicate_matchers ||= Spec::HashWithDeprecationNotice.new("predicate_matchers", "the new Matcher DSL")
34:       end

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