Module test_support 

Shared mock — public so unit tests, integration tests, and downstream coverage can wire in a recorder without rolling their own. Matches the shape used by compose::test_support and approvals::test_support.

Structs

MockMailboxSource

Test stub — returns canned rows on each call, records every arg pair. Mailbox is the most-asserted test surface in PR-UI-3 so the recorder lets snapshot + interaction tests verify “is the right filter being asked the right thing.”