Intent of return_nil_when_not_found

All 17 exact tests in this concept. Every test is marked by where it enters the hierarchy.

go.temporal.io/ 17 tests
- server/ 17 tests
  - service/ 17 tests
    
    history/ 17 tests
    
    api/ 11 tests
    
    respondworkflowtaskcompleted/ 11 tests
    
    TestWorkflowTaskCompletedHandlerSuite/ 11 tests
    
    TestUpdateWorkflow/ 8 tests
    
    go.temporal.io/server/service/history/api/respondworkflowtaskcompleted/TestWorkflowTaskCompletedHandlerSuite/TestUpdateWorkflow/Accept_Complete Inherited Accept_Complete
    
    go.temporal.io/server/service/history/api/respondworkflowtaskcompleted/TestWorkflowTaskCompletedHandlerSuite/TestUpdateWorkflow/Discard_speculative_WFT_with_events Inherited Discard_speculative_WFT_with_events
    
    go.temporal.io/server/service/history/api/respondworkflowtaskcompleted/TestWorkflowTaskCompletedHandlerSuite/TestUpdateWorkflow/Do_not_discard_speculative_WFT_with_more_than_10_events Inherited test_vars.go ×1
    
    go.temporal.io/server/service/history/api/respondworkflowtaskcompleted/TestWorkflowTaskCompletedHandlerSuite/TestUpdateWorkflow/GetHistory_failed Inherited api.go ×2
    
    go.temporal.io/server/service/history/api/respondworkflowtaskcompleted/TestWorkflowTaskCompletedHandlerSuite/TestUpdateWorkflow/Heartbeat_(empty_completion) Inherited registry.go ×3
    
    go.temporal.io/server/service/history/api/respondworkflowtaskcompleted/TestWorkflowTaskCompletedHandlerSuite/TestUpdateWorkflow/Reject Inherited Reject
    
    go.temporal.io/server/service/history/api/respondworkflowtaskcompleted/TestWorkflowTaskCompletedHandlerSuite/TestUpdateWorkflow/Write_failed_on_normal_task_queue Inherited Write_failed_on_normal_task_queue
    
    go.temporal.io/server/service/history/api/respondworkflowtaskcompleted/TestWorkflowTaskCompletedHandlerSuite/TestUpdateWorkflow/Write_failed_on_sticky_task_queue Inherited api.go ×4
    
    TestWorkflowTaskCompletionPagination/ 3 tests
    
    go.temporal.io/server/service/history/api/respondworkflowtaskcompleted/TestWorkflowTaskCompletedHandlerSuite/TestWorkflowTaskCompletionPagination/Duplicate_intermediate_page_is_idempotent Inherited workflow_task_state_machine.go ×1
    
    go.temporal.io/server/service/history/api/respondworkflowtaskcompleted/TestWorkflowTaskCompletedHandlerSuite/TestWorkflowTaskCompletionPagination/Single_page_completion_unchanged_when_pagination_enabled Inherited api.go ×1
    
    go.temporal.io/server/service/history/api/respondworkflowtaskcompleted/TestWorkflowTaskCompletedHandlerSuite/TestWorkflowTaskCompletionPagination/Two_page_completion_merges_commands Inherited Two_page_completion_merges_commands
    
    workflow/ 6 tests
    
    update/ 6 tests
    
    TestFind/ 1 test
    
    go.temporal.io/server/service/history/workflow/update/TestFind/return_nil_when_not_found Introduced here
    
    TestFindOrCreate/ 3 tests
    
    enforce_total_update_limit/ 2 tests
    
    go.temporal.io/server/service/history/workflow/update/TestFindOrCreate/enforce_total_update_limit/accepting_1st_update_still_denies_new_update_to_be_created Inherited accepting_1st_update_still_denies_new_update_to_be_created
    
    go.temporal.io/server/service/history/workflow/update/TestFindOrCreate/enforce_total_update_limit/completing_1st_update_still_denies_new_update_to_be_created Inherited completing_1st_update_still_denies_new_update_to_be_created
    
    go.temporal.io/server/service/history/workflow/update/TestFindOrCreate/create_update_if_not_found Inherited create_update_if_not_found
    
    TestHasOutgoingMessages/ 1 test
    
    go.temporal.io/server/service/history/workflow/update/TestHasOutgoingMessages/registry_with_created_update Inherited registry_with_created_update
    
    TestNewRegistry/ 1 test
    
    go.temporal.io/server/service/history/workflow/update/TestNewRegistry/registry_created_from_empty_store_has_no_updates Inherited registry_created_from_empty_store_has_no_updates