While implementing CDRIVER-3963, I realized that libmongoc's unified test runner only appends sessions (i.e. mongoc_client_session_append) for the following operations:

• operation_create_index
• operation_create_collection
• operation_insert_one

This dates back to 56ada16 for CDRIVER-3422, so it looks like this is just an incomplete implementation of the spec intended to pass the original tests from DRIVERS-709.

I plan to add support for "operation_find" in CDRIVER-3963, but wanted to create this ticket to cover all remaining operations that are documented as supporting a "session" option.