[SERVER-20705] Increase unit test coverage of query execution stages Created: 30/Sep/15  Updated: 06/Dec/22

Status: Backlog
Project: Core Server
Component/s: Querying
Affects Version/s: None
Fix Version/s: None

Type: Improvement Priority: Major - P3
Reporter: David Storch Assignee: Backlog - Query Execution
Resolution: Unresolved Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Duplicate
is duplicated by SERVER-15495 Add dbtests for new query stages Closed
Assigned Teams:
Query Execution
Participants:

 Description   

We should have a unit test for every query execution stage. Doing so is non-trivial as it may require mocking / untangling of dependencies.

For instance, it would be nice to be able to unit test UpdateStage without a real collection or performing real writes. A mock collection could accept writes or be configured to issue WriteConflictException at predictable points in the test. Similarly, we could create mock implementations of IndexCursor and RecordCursor in order to unit test stages which perform data access.


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