{
  "description": "transactions are correctly pinned to connections for load-balanced clusters",
  "schemaVersion": "1.3",
  "runOnRequirements": [
    {
      "topologies": [
        "load-balanced"
      ]
    }
  ],
  "createEntities": [
    {
      "client": {
        "id": "client0",
        "useMultipleMongoses": true,
        "observeEvents": [
          "commandStartedEvent",
          "connectionReadyEvent",
          "connectionClosedEvent",
          "connectionCheckedOutEvent",
          "connectionCheckedInEvent"
        ]
      }
    },
    {
      "session": {
        "id": "session0",
        "client": "client0"
      }
    },
    {
      "database": {
        "id": "database0",
        "client": "client0",
        "databaseName": "database0Name"
      }
    },
    {
      "collection": {
        "id": "collection0",
        "database": "database0",
        "collectionName": "coll0"
      }
    }
  ],
  "initialData": [
    {
      "collectionName": "coll0",
      "databaseName": "database0Name",
      "documents": [
        {
          "_id": 1
        },
        {
          "_id": 2
        },
        {
          "_id": 3
        }
      ]
    }
  ],
  "_yamlAnchors": {
    "documents": [
      {
        "_id": 4
      }
    ]
  },
  "tests": [
    {
      "description": "sessions are reused in LB mode",
      "operations": [
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            }
          }
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            }
          }
        },
        {
          "name": "assertSameLsidOnLastTwoCommands",
          "object": "testRunner",
          "arguments": {
            "client": "client0"
          }
        }
      ]
    },
    {
      "description": "all operations go to the same mongos",
      "operations": [
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        },
        {
          "name": "commitTransaction",
          "object": "session0"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "transaction can be committed multiple times",
      "operations": [
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        },
        {
          "name": "commitTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        },
        {
          "name": "commitTransaction",
          "object": "session0"
        },
        {
          "name": "commitTransaction",
          "object": "session0"
        },
        {
          "name": "commitTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is not released after a non-transient CRUD error",
      "operations": [
        {
          "name": "failPoint",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "failPoint": {
              "configureFailPoint": "failCommand",
              "mode": {
                "times": 1
              },
              "data": {
                "failCommands": [
                  "insert"
                ],
                "errorCode": 51
              }
            }
          }
        },
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          },
          "expectError": {
            "errorCode": 51,
            "errorLabelsOmit": [
              "TransientTransactionError"
            ]
          }
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is not released after a non-transient commit error",
      "operations": [
        {
          "name": "failPoint",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "failPoint": {
              "configureFailPoint": "failCommand",
              "mode": {
                "times": 1
              },
              "data": {
                "failCommands": [
                  "commitTransaction"
                ],
                "errorCode": 51
              }
            }
          }
        },
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "commitTransaction",
          "object": "session0",
          "expectError": {
            "errorCode": 51,
            "errorLabelsOmit": [
              "TransientTransactionError"
            ]
          }
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is released after a non-transient abort error",
      "operations": [
        {
          "name": "failPoint",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "failPoint": {
              "configureFailPoint": "failCommand",
              "mode": {
                "times": 1
              },
              "data": {
                "failCommands": [
                  "abortTransaction"
                ],
                "errorCode": 51
              }
            }
          }
        },
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "abortTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "abortTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is released after a transient non-network CRUD error",
      "runOnRequirements": [
        {
          "serverless": "forbid"
        }
      ],
      "operations": [
        {
          "name": "failPoint",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "failPoint": {
              "configureFailPoint": "failCommand",
              "mode": {
                "times": 1
              },
              "data": {
                "failCommands": [
                  "insert"
                ],
                "errorCode": 24
              }
            }
          }
        },
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          },
          "expectError": {
            "errorCode": 24,
            "errorLabelsContain": [
              "TransientTransactionError"
            ]
          }
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        },
        {
          "name": "abortTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "abortTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is released after a transient network CRUD error",
      "runOnRequirements": [
        {
          "serverless": "forbid"
        }
      ],
      "operations": [
        {
          "name": "failPoint",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "failPoint": {
              "configureFailPoint": "failCommand",
              "mode": {
                "times": 1
              },
              "data": {
                "failCommands": [
                  "insert"
                ],
                "closeConnection": true
              }
            }
          }
        },
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          },
          "expectError": {
            "isClientError": true,
            "errorLabelsContain": [
              "TransientTransactionError"
            ]
          }
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        },
        {
          "name": "abortTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "abortTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionClosedEvent": {
                "reason": "error"
              }
            },
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is released after a transient non-network commit error",
      "runOnRequirements": [
        {
          "serverless": "forbid"
        }
      ],
      "operations": [
        {
          "name": "failPoint",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "failPoint": {
              "configureFailPoint": "failCommand",
              "mode": {
                "times": 1
              },
              "data": {
                "failCommands": [
                  "commitTransaction"
                ],
                "errorCode": 24
              }
            }
          }
        },
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "commitTransaction",
          "object": "session0",
          "expectError": {
            "errorCode": 24,
            "errorLabelsContain": [
              "TransientTransactionError"
            ]
          }
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is released after a transient network commit error",
      "operations": [
        {
          "name": "failPoint",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "failPoint": {
              "configureFailPoint": "failCommand",
              "mode": {
                "times": 1
              },
              "data": {
                "failCommands": [
                  "commitTransaction"
                ],
                "closeConnection": true
              }
            }
          }
        },
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "commitTransaction",
          "object": "session0",
          "ignoreResultAndError": true
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionClosedEvent": {
                "reason": "error"
              }
            },
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is released after a transient non-network abort error",
      "operations": [
        {
          "name": "failPoint",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "failPoint": {
              "configureFailPoint": "failCommand",
              "mode": {
                "times": 1
              },
              "data": {
                "failCommands": [
                  "abortTransaction"
                ],
                "errorCode": 24
              }
            }
          }
        },
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "abortTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "abortTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is released after a transient network abort error",
      "operations": [
        {
          "name": "failPoint",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "failPoint": {
              "configureFailPoint": "failCommand",
              "mode": {
                "times": 1
              },
              "data": {
                "failCommands": [
                  "abortTransaction"
                ],
                "closeConnection": true
              }
            }
          }
        },
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "abortTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "abortTransaction"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "abortTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionClosedEvent": {
                "reason": "error"
              }
            },
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is released on successful abort",
      "operations": [
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "abortTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "abortTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is returned when a new transaction is started",
      "operations": [
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "commitTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        },
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        },
        {
          "name": "commitTransaction",
          "object": "session0"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "pinned connection is returned when a non-transaction operation uses the session",
      "operations": [
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "commitTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "commitTransaction"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            }
          ]
        }
      ]
    },
    {
      "description": "a connection can be shared by a transaction and a cursor",
      "operations": [
        {
          "name": "startTransaction",
          "object": "session0"
        },
        {
          "name": "insertOne",
          "object": "collection0",
          "arguments": {
            "document": {
              "x": 1
            },
            "session": "session0"
          }
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        },
        {
          "name": "createFindCursor",
          "object": "collection0",
          "arguments": {
            "filter": {},
            "batchSize": 2,
            "session": "session0"
          },
          "saveResultAsEntity": "cursor0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        },
        {
          "name": "close",
          "object": "cursor0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 1
          }
        },
        {
          "name": "abortTransaction",
          "object": "session0"
        },
        {
          "name": "assertNumberConnectionsCheckedOut",
          "object": "testRunner",
          "arguments": {
            "client": "client0",
            "connections": 0
          }
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "commandName": "insert"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "find"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "killCursors"
              }
            },
            {
              "commandStartedEvent": {
                "commandName": "abortTransaction"
              }
            }
          ]
        },
        {
          "client": "client0",
          "eventType": "cmap",
          "events": [
            {
              "connectionReadyEvent": {}
            },
            {
              "connectionCheckedOutEvent": {}
            },
            {
              "connectionCheckedInEvent": {}
            }
          ]
        }
      ]
    }
  ]
}