--- /dev/null
+module Spec
+ module Mocks
+ class OrderGroup
+ def initialize error_generator
+ @error_generator = error_generator
+ @ordering = Array.new
+ end
+
+ def register(expectation)
+ @ordering << expectation
+ end
+
+ def ready_for?(expectation)
+ return @ordering.first == expectation
+ end
+
+ def consume
+ @ordering.shift
+ end
+
+ def handle_order_constraint expectation
+ return unless @ordering.include? expectation
+ return consume if ready_for?(expectation)
+ @error_generator.raise_out_of_order_error expectation.sym
+ end
+
+ end
+ end
+end