### Terraform Version ```shell 1.14.0 ``` ### Terraform Configuration Files ## main.tf ```terraform terraform { required_providers { databricks = { source = "databricks/databricks" version = "1.97.0" } } required_version = ">= 1.14.0" } data "databricks_external_location" "test" { name = "test" } ``` ## test.tftest.hcl ```hcl mock_provider "databricks" {} run "nothing_mocked_failure_shows_generated_id" { override_data { target = data.databricks_external_location.test } command = plan assert { condition = data.databricks_external_location.test.id == "expecting failure, not mocked" error_message = "See diff for generated ID" } } run "id_mocked_successfully" { override_data { target = data.databricks_external_location.test values = { id = "with-id-mocked" } } command = plan assert { condition = data.databricks_external_location.test.id == "with-id-mocked" error_message = "Expected the external location ID to be 'with-id-mocked'" } } run "external_location_url_mocked_unsuccessfully" { override_data { target = data.databricks_external_location.test values = { external_location_info = [{ url = "abfss://container@foo.bar/" }] } } command = plan assert { condition = data.databricks_external_location.test.external_location_info[0].url == "abfss://container@foo.bar/" error_message = "Expected the external location URL to be 'abfss://container@foo.bar/'" } } ``` ### Debug Output Output of `TF_LOG=TRACE terraform test`: [gist](https://gist.github.com/sanderginn/7f6ded4d51278a50013c78474b9ede75) ### Expected Behavior I would expect the test `nothing_mocked_failure_shows_generated_id` to fail, and the other tests to pass. ### Actual Behavior In addition to `nothing_mocked_failure_shows_generated_id`, `external_location_url_mocked_unsuccessfully` also fails: ``` run "external_location_url_mocked_unsuccessfully"... fail ╷ │ Error: Invalid index │ │ on variable_validation.tftest.hcl line 43, in run "external_location_url_mocked_unsuccessfully": │ 43: condition = data.databricks_external_location.test.external_location_info[0].url == "abfss://container@foo.bar/" │ ├──────────────── │ │ data.databricks_external_location.test.external_location_info is empty list of object │ │ The given key does not identify an element in this collection value: the collection has no elements. ╵ ``` Inspecting the data source value using an assertion which fails and printing the contents shows that `external_location_url` is not set: ``` ╷ │ Error: Test assertion failed │ │ on variable_validation.tftest.hcl line 43, in run "external_location_url_mocked_unsuccessfully": │ 43: condition = length(data.databricks_external_location.test.external_location_info) > 0 │ ├──────────────── │ │ │ jsonencoded value of data: │ {"external_location_info":[],"id":"c2rwnoaz","name":"test","provider_config":[]} ``` ### Steps to Reproduce 1. `terraform test` ### Additional Context My strong suspicion is that the type conversion of tuple to list is not occurring properly in the `override_data` block, and instead of raising an error, the default value is used (an empty collection, as [defined in the docs](https://developer.hashicorp.com/terraform/language/tests/mocking#generated-data)). An argument against this suspicion is that types seem to be enforced when setting properties in `override_data` blocks. When I set the `id` attribute to `["with-id-mocked"]` in the test `id_mocked_successfully`, it does raise an error: ``` run "id_mocked_successfully"... fail ╷ │ Error: Failed to compute attribute │ │ with data.databricks_external_location.test, │ on main.tf line 12, in data "databricks_external_location" "test": │ 12: data "databricks_external_location" "test" { │ │ Terraform could not compute a value for the target type string with the mocked data defined at variable_validation.tftest.hcl:17,3-16 with the attribute ".id": string required, but have tuple. ``` However, I'm not sure whether `[]` is considered valid input for an list attribute during type checking. When I inspect the contents of a data source successfully fetched from a live environment using `terraform console`, I can see that the `external_location_info` is defined with `tolist()`: ``` > data.databricks_external_location.schema_locations { "" = { "external_location_info" = tolist([ { "browse_only" = false "comment" = "" "created_at" = 1760513678249 "created_by" = "" "credential_id" = "" "credential_name" = "" "enable_file_events" = false "encryption_details" = tolist([]) "fallback" = false "file_event_queue" = tolist([]) "isolation_mode" = "ISOLATION_MODE_OPEN" "metastore_id" = "" "name" = "" "owner" = "" "read_only" = false "updated_at" = 1760513678675 "updated_by" = "" "url" = "abfss://@.dfs.core.windows.net/" }, ]) "id" = "" "name" = "" "provider_config" = tolist(null) /* of object */ } } ``` Since functions in `override_data` blocks are not permitted, I don't know how I can verify whether my suspicion is correct. ### References _No response_ ### Generative AI / LLM assisted development? _No response_