Contents

module Matchi
  # **Expecting errors** matcher.
  class RaiseException < BasicObject
    # Initialize the matcher with a descendant of class Exception.
    #
    # @example Divided by 0 matcher
    #   Matchi::RaiseException.new(ZeroDivisionError)
    #
    # @param expected [.exception] The class of the expected exception.
    def initialize(expected)
      @expected = expected
    end

    # @example Is it raising NameError?
    #   raise_exception = Matchi::RaiseException.new(NameError)
    #   raise_exception.matches? { Boom } # => true
    #
    # @yieldreturn [#object_id] the actual value to compare to the expected one.
    #
    # @return [Boolean] Comparison between actual and expected values.
    def matches?
      yield
    rescue @expected
      true
    else
      false
    end
  end
end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
matchi-0.0.9	lib/matchi/raise_exception.rb
matchi-0.0.8	lib/matchi/raise_exception.rb
matchi-0.0.7	lib/matchi/raise_exception.rb
matchi-0.0.6	lib/matchi/raise_exception.rb