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/usr/lib/ruby/vendor_ruby/rspec/matchers/built_in/cover.rb is in ruby-rspec-expectations 3.5.0c3e0m0s0-1.

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module RSpec
  module Matchers
    module BuiltIn
      # @api private
      # Provides the implementation for `cover`.
      # Not intended to be instantiated directly.
      class Cover < BaseMatcher
        def initialize(*expected)
          @expected = expected
        end

        def matches?(range)
          @actual = range
          @expected.all? { |e| range.cover?(e) }
        end

        def does_not_match?(range)
          @actual = range
          expected.none? { |e| range.cover?(e) }
        end
      end
    end
  end
end