loadbalanced-emit-topology-changed-before-close.yml

description: "loadbalanced-emit-topology-description-changed-before-close"

schemaVersion: "1.20"

runOnRequirements:
  - topologies:
      - load-balanced
    minServerVersion: "4.4" # awaitable hello

tests:
  - description: "Topology lifecycle"
    operations:
      - name: createEntities
        object: testRunner
        arguments:
          entities:
            - client:
                id: &client client
                observeEvents:
                  - topologyDescriptionChangedEvent
                  - topologyOpeningEvent
                  - topologyClosedEvent
      # ensure the topology has been fully discovered before closing the client.
      # expected events are initial server discovery and server connect event.
      - name: waitForEvent
        object: testRunner
        arguments:
          client: *client
          event:
            topologyDescriptionChangedEvent: {}
          count: 2
      - name: close
        object: *client
    expectEvents:
      - client: *client
        eventType: sdam
        events:
          - topologyOpeningEvent: {}
          - topologyDescriptionChangedEvent: # unknown -> unknown w disconnected server
              previousDescription: 
                type: "Unknown"
              newDescription: {}
          - topologyDescriptionChangedEvent:  # unknown w disconnected server -> loadBalanced
              newDescription:
                type: "LoadBalanced"
          - topologyDescriptionChangedEvent:  # loadbalanced -> unknown
              newDescription:
                type: "Unknown"
          - topologyClosedEvent: {}