    # File lib/spec/mocks/message_expectation.rb, line 305
            def set_expected_received_count(relativity, n)
              @at_least = (relativity == :at_least)
              @at_most = (relativity == :at_most)
              @expected_received_count = case n
                when Numeric
                  n
                when :once
                  1
                when :twice
                  2
              end
            end