{
  "description": "write-concern",
  "schemaVersion": "1.9",
  "runOnRequirements": [
    {
      "minServerVersion": "4.0",
      "topologies": [
        "replicaset"
      ]
    },
    {
      "minServerVersion": "4.1.8",
      "topologies": [
        "sharded",
        "load-balanced"
      ]
    }
  ],
  "createEntities": [
    {
      "client": {
        "id": "client0",
        "useMultipleMongoses": false,
        "observeEvents": [
          "commandStartedEvent"
        ]
      }
    },
    {
      "database": {
        "id": "database0",
        "client": "client0",
        "databaseName": "transaction-tests"
      }
    },
    {
      "collection": {
        "id": "collection0",
        "database": "database0",
        "collectionName": "test"
      }
    },
    {
      "collection": {
        "id": "collection_w0",
        "database": "database0",
        "collectionName": "test",
        "collectionOptions": {
          "writeConcern": {
            "w": 0
          }
        }
      }
    },
    {
      "session": {
        "id": "session0",
        "client": "client0"
      }
    }
  ],
  "initialData": [
    {
      "collectionName": "test",
      "databaseName": "transaction-tests",
      "documents": [
        {
          "_id": 0
        }
      ]
    }
  ],
  "tests": [
    {
      "description": "commit with majority",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction",
          "arguments": {
            "writeConcern": {
              "w": "majority"
            }
          }
        },
        {
          "object": "collection0",
          "name": "insertOne",
          "arguments": {
            "session": "session0",
            "document": {
              "_id": 1
            }
          },
          "expectResult": {
            "$$unsetOrMatches": {
              "insertedId": {
                "$$unsetOrMatches": 1
              }
            }
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "insert": "test",
                  "documents": [
                    {
                      "_id": 1
                    }
                  ],
                  "ordered": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "insert",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "w": "majority"
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": [
            {
              "_id": 0
            },
            {
              "_id": 1
            }
          ]
        }
      ]
    },
    {
      "description": "commit with default",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection0",
          "name": "insertOne",
          "arguments": {
            "session": "session0",
            "document": {
              "_id": 1
            }
          },
          "expectResult": {
            "$$unsetOrMatches": {
              "insertedId": {
                "$$unsetOrMatches": 1
              }
            }
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "insert": "test",
                  "documents": [
                    {
                      "_id": 1
                    }
                  ],
                  "ordered": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "insert",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": [
            {
              "_id": 0
            },
            {
              "_id": 1
            }
          ]
        }
      ]
    },
    {
      "description": "abort with majority",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction",
          "arguments": {
            "writeConcern": {
              "w": "majority"
            }
          }
        },
        {
          "object": "collection0",
          "name": "insertOne",
          "arguments": {
            "session": "session0",
            "document": {
              "_id": 1
            }
          },
          "expectResult": {
            "$$unsetOrMatches": {
              "insertedId": {
                "$$unsetOrMatches": 1
              }
            }
          }
        },
        {
          "object": "session0",
          "name": "abortTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "insert": "test",
                  "documents": [
                    {
                      "_id": 1
                    }
                  ],
                  "ordered": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "insert",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "abortTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "w": "majority"
                  }
                },
                "commandName": "abortTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": [
            {
              "_id": 0
            }
          ]
        }
      ]
    },
    {
      "description": "abort with default",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection0",
          "name": "insertOne",
          "arguments": {
            "session": "session0",
            "document": {
              "_id": 1
            }
          },
          "expectResult": {
            "$$unsetOrMatches": {
              "insertedId": {
                "$$unsetOrMatches": 1
              }
            }
          }
        },
        {
          "object": "session0",
          "name": "abortTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "insert": "test",
                  "documents": [
                    {
                      "_id": 1
                    }
                  ],
                  "ordered": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "insert",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "abortTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "abortTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": [
            {
              "_id": 0
            }
          ]
        }
      ]
    },
    {
      "description": "start with unacknowledged write concern",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction",
          "arguments": {
            "writeConcern": {
              "w": 0
            }
          },
          "expectError": {
            "isClientError": true,
            "errorContains": "transactions do not support unacknowledged write concern"
          }
        }
      ]
    },
    {
      "description": "start with implicit unacknowledged write concern",
      "operations": [
        {
          "object": "testRunner",
          "name": "createEntities",
          "arguments": {
            "entities": [
              {
                "client": {
                  "id": "client1",
                  "useMultipleMongoses": false,
                  "uriOptions": {
                    "w": 0
                  }
                }
              },
              {
                "session": {
                  "id": "session1",
                  "client": "client1"
                }
              }
            ]
          }
        },
        {
          "object": "session1",
          "name": "startTransaction",
          "expectError": {
            "isClientError": true,
            "errorContains": "transactions do not support unacknowledged write concern"
          }
        }
      ]
    },
    {
      "description": "unacknowledged write concern coll insertOne",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection_w0",
          "name": "insertOne",
          "arguments": {
            "session": "session0",
            "document": {
              "_id": 1
            }
          },
          "expectResult": {
            "$$unsetOrMatches": {
              "insertedId": {
                "$$unsetOrMatches": 1
              }
            }
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "insert": "test",
                  "documents": [
                    {
                      "_id": 1
                    }
                  ],
                  "ordered": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "insert",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": [
            {
              "_id": 0
            },
            {
              "_id": 1
            }
          ]
        }
      ]
    },
    {
      "description": "unacknowledged write concern coll insertMany",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection_w0",
          "name": "insertMany",
          "arguments": {
            "session": "session0",
            "documents": [
              {
                "_id": 1
              },
              {
                "_id": 2
              }
            ]
          },
          "expectResult": {
            "$$unsetOrMatches": {
              "insertedIds": {
                "$$unsetOrMatches": {
                  "0": 1,
                  "1": 2
                }
              }
            }
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "insert": "test",
                  "documents": [
                    {
                      "_id": 1
                    },
                    {
                      "_id": 2
                    }
                  ],
                  "ordered": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "insert",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": [
            {
              "_id": 0
            },
            {
              "_id": 1
            },
            {
              "_id": 2
            }
          ]
        }
      ]
    },
    {
      "description": "unacknowledged write concern coll bulkWrite",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection_w0",
          "name": "bulkWrite",
          "arguments": {
            "session": "session0",
            "requests": [
              {
                "insertOne": {
                  "document": {
                    "_id": 1
                  }
                }
              }
            ]
          },
          "expectResult": {
            "deletedCount": 0,
            "insertedCount": 1,
            "insertedIds": {
              "$$unsetOrMatches": {
                "0": 1
              }
            },
            "matchedCount": 0,
            "modifiedCount": 0,
            "upsertedCount": 0,
            "upsertedIds": {}
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "insert": "test",
                  "documents": [
                    {
                      "_id": 1
                    }
                  ],
                  "ordered": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "insert",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": [
            {
              "_id": 0
            },
            {
              "_id": 1
            }
          ]
        }
      ]
    },
    {
      "description": "unacknowledged write concern coll deleteOne",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection_w0",
          "name": "deleteOne",
          "arguments": {
            "session": "session0",
            "filter": {
              "_id": 0
            }
          },
          "expectResult": {
            "deletedCount": 1
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "delete": "test",
                  "deletes": [
                    {
                      "q": {
                        "_id": 0
                      },
                      "limit": 1
                    }
                  ],
                  "ordered": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "delete",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": []
        }
      ]
    },
    {
      "description": "unacknowledged write concern coll deleteMany",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection_w0",
          "name": "deleteMany",
          "arguments": {
            "session": "session0",
            "filter": {
              "_id": 0
            }
          },
          "expectResult": {
            "deletedCount": 1
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "delete": "test",
                  "deletes": [
                    {
                      "q": {
                        "_id": 0
                      },
                      "limit": 0
                    }
                  ],
                  "ordered": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "delete",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": []
        }
      ]
    },
    {
      "description": "unacknowledged write concern coll updateOne",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection_w0",
          "name": "updateOne",
          "arguments": {
            "session": "session0",
            "filter": {
              "_id": 0
            },
            "update": {
              "$inc": {
                "x": 1
              }
            },
            "upsert": true
          },
          "expectResult": {
            "matchedCount": 1,
            "modifiedCount": 1,
            "upsertedCount": 0
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "update": "test",
                  "updates": [
                    {
                      "q": {
                        "_id": 0
                      },
                      "u": {
                        "$inc": {
                          "x": 1
                        }
                      },
                      "upsert": true,
                      "multi": {
                        "$$unsetOrMatches": false
                      }
                    }
                  ],
                  "ordered": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "update",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": [
            {
              "_id": 0,
              "x": 1
            }
          ]
        }
      ]
    },
    {
      "description": "unacknowledged write concern coll updateMany",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection_w0",
          "name": "updateMany",
          "arguments": {
            "session": "session0",
            "filter": {
              "_id": 0
            },
            "update": {
              "$inc": {
                "x": 1
              }
            },
            "upsert": true
          },
          "expectResult": {
            "matchedCount": 1,
            "modifiedCount": 1,
            "upsertedCount": 0
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "update": "test",
                  "updates": [
                    {
                      "q": {
                        "_id": 0
                      },
                      "u": {
                        "$inc": {
                          "x": 1
                        }
                      },
                      "multi": true,
                      "upsert": true
                    }
                  ],
                  "ordered": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "update",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": [
            {
              "_id": 0,
              "x": 1
            }
          ]
        }
      ]
    },
    {
      "description": "unacknowledged write concern coll findOneAndDelete",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection_w0",
          "name": "findOneAndDelete",
          "arguments": {
            "session": "session0",
            "filter": {
              "_id": 0
            }
          },
          "expectResult": {
            "_id": 0
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "findAndModify": "test",
                  "query": {
                    "_id": 0
                  },
                  "remove": true,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "findAndModify",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": []
        }
      ]
    },
    {
      "description": "unacknowledged write concern coll findOneAndReplace",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection_w0",
          "name": "findOneAndReplace",
          "arguments": {
            "session": "session0",
            "filter": {
              "_id": 0
            },
            "replacement": {
              "x": 1
            },
            "returnDocument": "Before"
          },
          "expectResult": {
            "_id": 0
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "findAndModify": "test",
                  "query": {
                    "_id": 0
                  },
                  "update": {
                    "x": 1
                  },
                  "new": {
                    "$$unsetOrMatches": false
                  },
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "findAndModify",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": [
            {
              "_id": 0,
              "x": 1
            }
          ]
        }
      ]
    },
    {
      "description": "unacknowledged write concern coll findOneAndUpdate",
      "operations": [
        {
          "object": "session0",
          "name": "startTransaction"
        },
        {
          "object": "collection_w0",
          "name": "findOneAndUpdate",
          "arguments": {
            "session": "session0",
            "filter": {
              "_id": 0
            },
            "update": {
              "$inc": {
                "x": 1
              }
            },
            "returnDocument": "Before"
          },
          "expectResult": {
            "_id": 0
          }
        },
        {
          "object": "session0",
          "name": "commitTransaction"
        }
      ],
      "expectEvents": [
        {
          "client": "client0",
          "events": [
            {
              "commandStartedEvent": {
                "command": {
                  "findAndModify": "test",
                  "query": {
                    "_id": 0
                  },
                  "update": {
                    "$inc": {
                      "x": 1
                    }
                  },
                  "new": {
                    "$$unsetOrMatches": false
                  },
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": true,
                  "autocommit": false,
                  "readConcern": {
                    "$$exists": false
                  },
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "findAndModify",
                "databaseName": "transaction-tests"
              }
            },
            {
              "commandStartedEvent": {
                "command": {
                  "commitTransaction": 1,
                  "lsid": {
                    "$$sessionLsid": "session0"
                  },
                  "txnNumber": {
                    "$numberLong": "1"
                  },
                  "startTransaction": {
                    "$$exists": false
                  },
                  "autocommit": false,
                  "writeConcern": {
                    "$$exists": false
                  }
                },
                "commandName": "commitTransaction",
                "databaseName": "admin"
              }
            }
          ]
        }
      ],
      "outcome": [
        {
          "collectionName": "test",
          "databaseName": "transaction-tests",
          "documents": [
            {
              "_id": 0,
              "x": 1
            }
          ]
        }
      ]
    }
  ]
}