Feature: Message router new coverage
  As a developer
  I want the message_router module fully tested
  So that node and edge builders stay stable

  Scenario: build_message_router_node creates NodeConfig with correct type
    When I build a message router node named "router1" with rules
    Then the node name should be "router1"
    And the node type should be MESSAGE_ROUTER
    And the node metadata should contain rules

  Scenario: build_message_router_edges creates edges from rules
    When I build message router edges for "router1" with two target rules
    Then the edge count should be 3
    And the last edge target should be "end"

  Scenario: build_message_router_edges handles empty rules
    When I build message router edges for "router1" with no rules
    Then the edge count should be 1
    And the last edge target should be "end"

  Scenario: build_message_router_edges skips rules without target
    When I build message router edges for "router1" with a rule missing target
    Then the edge count should be 1