mongodb 0.9.1

The official MongoDB driver for Rust (currently in alpha)
Documentation 
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runOn:
    -
        minServerVersion: "4.1.11"

data:
    - { _id: 1, x: 11 }
    - { _id: 2, x: 22 }
    - { _id: 3, x: 33 }

collection_name: &collection_name 'test_aggregate_merge'

tests:
  -
    description: "Aggregate with $merge"
    operations:
      -
        object: collection
        name: aggregate
        arguments: &arguments
          pipeline: &pipeline
            - $sort: { x : 1 }
            - $match: { _id: { $gt: 1 } }
            - $merge: { into: &output_collection "other_test_collection" }
    expectations:
      -
        command_started_event:
          command:
            aggregate: *collection_name
            pipeline: *pipeline
    outcome: &outcome
      collection:
        name: *output_collection
        data:
          - { _id: 2, x: 22 }
          - { _id: 3, x: 33 }
  -
    description: "Aggregate with $merge and batch size of 0"
    operations:
      -
        object: collection
        name: aggregate
        arguments:
          <<: *arguments
          batchSize: 0
    expectations:
      -
        command_started_event:
          command:
            aggregate: *collection_name
            pipeline: *pipeline
            cursor: {}
    outcome: *outcome
  -
    description: "Aggregate with $merge and majority readConcern"
    operations:
      -
        object: collection
        name: aggregate
        collectionOptions:
          readConcern: { level: "majority" }
        arguments: *arguments
    expectations:
      -
        command_started_event:
          command:
            aggregate: *collection_name
            pipeline: *pipeline
            readConcern: { level: "majority" }
    outcome: *outcome
  -
    description: "Aggregate with $merge and local readConcern"
    operations:
      -
        object: collection
        name: aggregate
        collectionOptions:
          readConcern: { level: "local" }
        arguments: *arguments
    expectations:
      -
        command_started_event:
          command:
            aggregate: *collection_name
            pipeline: *pipeline
            readConcern: { level: "local" }
    outcome: *outcome
  -
    description: "Aggregate with $merge and available readConcern"
    operations:
      -
        object: collection
        name: aggregate
        collectionOptions:
          readConcern: { level: "available" }
        arguments: *arguments
    expectations:
      -
        command_started_event:
          command:
            aggregate: *collection_name
            pipeline: *pipeline
            readConcern: { level: "available" }
    outcome: *outcome