add_message_expectation

# File lib/spec/mocks/proxy.rb, line 39
      def add_message_expectation(expected_from, sym, opts={}, &block)        
        __add sym
        warn_if_nil_class sym
        if existing_stub = @stubs.detect {|s| s.sym == sym }
          expectation = existing_stub.build_child(expected_from, block_given?? block : nil, 1, opts)
        else
          expectation = MessageExpectation.new(@error_generator, @expectation_ordering, expected_from, sym, block_given? ? block : nil, 1, opts)
        end
        @expectations << expectation
        @expectations.last
      end