set_expected_received_count

# File lib/spec/mocks/message_expectation.rb, line 314
        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