Introduce custom assertion

app/models/epp/response/result/code.rb

@@ -0,0 +1,81 @@
+module Epp
+  class Response
+    class Result
+      class Code
+        attr_reader :value
+
+        KEY_TO_VALUE = {
+          completed_successfully: 1000,
+          completed_successfully_action_pending: 1001,
+          completed_successfully_no_messages: 1300,
+          completed_successfully_ack_to_dequeue: 1301,
+          completed_successfully_ending_session: 1500,
+          unknown_command: 2000,
+          syntax_error: 2001,
+          use_error: 2002,
+          required_parameter_missing: 2003,
+          parameter_value_range_error: 2004,
+          parameter_value_syntax_error: 2005,
+          billing_failure: 2104,
+          object_is_not_eligible_for_renewal: 2105,
+          authorization_error: 2201,
+          invalid_authorization_information: 2202,
+          object_does_not_exist: 2303,
+          object_status_prohibits_operation: 2304,
+          object_association_prohibits_operation: 2305,
+          parameter_value_policy_error: 2306,
+          data_management_policy_violation: 2308,
+          authentication_error_server_closing_connection: 2501,
+        }.freeze
+        private_constant :KEY_TO_VALUE
+
+        DEFAULT_DESCRIPTIONS = {
+          1000 => 'Command completed successfully',
+          1001 => 'Command completed successfully; action pending',
+          1300 => 'Command completed successfully; no messages',
+          1301 => 'Command completed successfully; ack to dequeue',
+          1500 => 'Command completed successfully; ending session',
+          2000 => 'Unknown command',
+          2001 => 'Command syntax error',
+          2002 => 'Command use error',
+          2003 => 'Required parameter missing',
+          2004 => 'Parameter value range error',
+          2005 => 'Parameter value syntax error',
+          2104 => 'Billing failure',
+          2105 => 'Object is not eligible for renewal',
+          2201 => 'Authorization error',
+          2202 => 'Invalid authorization information',
+          2303 => 'Object does not exist',
+          2304 => 'Object status prohibits operation',
+          2305 => 'Object association prohibits operation',
+          2306 => 'Parameter value policy error',
+          2308 => 'Data management policy violation',
+          2501 => 'Authentication error; server closing connection',
+        }.freeze
+        private_constant :DEFAULT_DESCRIPTIONS
+
+        def self.codes
+          KEY_TO_VALUE
+        end
+
+        def self.default_descriptions
+          DEFAULT_DESCRIPTIONS
+        end
+
+        def self.key(key)
+          new(KEY_TO_VALUE[key])
+        end
+
+        def initialize(value)
+          value = value.to_i
+          raise ArgumentError, "Invalid value: #{value}" unless KEY_TO_VALUE.value?(value)
+          @value = value
+        end
+
+        def ==(other)
+          value == other.value
+        end
+      end
+    end
+  end
+end