The following prose tests are relevant but not implemented in our driver:

• ReadConcern
  • Commands supporting a read concern MUST NOT send the default read concern to the server.
  • Commands supporting a read concern MUST send any non-default read concern to the server.

• WriteConcern
  • Commands supporting a write concern MUST NOT send the default write concern to the server.
  • Commands supporting a write concern MUST send any non-default acknowledged write concern to the server, either in the command or as a getLastError.

The following spec tests should be implemented as unit tests but have not been implemented in our driver:

• connection-string (read-write-concern spec subdirectory)
• document (read-write-concern spec subdirectory)