spec/mspec/lib/mspec/matchers/be_false.rb


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class BeFalseMatcher
  def matches?(actual)
    @actual = actual
    @actual == false
  end

  def failure_message
    ["Expected #{@actual.inspect}", "to be false"]
  end

  def negative_failure_message
    ["Expected #{@actual.inspect}", "not to be false"]
  end
end

class Object
  def be_false
    BeFalseMatcher.new
  end
end