### Terraform Version ```shell 1.11.4 ``` ### Terraform Configuration Files ```terraform data "google_project" "main" {} resource "google_compute_network" "vm_vpc" { name = "foo-${data.google_project.main.project_id}" } ``` ```terraform run "test" { command = plan override_data { target = data.google_project.main values = { project_id = "test_project_id" } } } ``` ### Debug Output https://gist.github.com/nferch-circle/457fdf2b798d9be99e2430a3bfa0df48 ### Expected Behavior The test passes, because I am overriding the `project_id` value to the `google_project` datasource. ### Actual Behavior The tests fails because the `project_id` value is null. ``` ╷ │ Error: Invalid template interpolation value │ │ on main.tf line 3, in resource "google_compute_network" "vm_vpc": │ 3: name = "foo-${data.google_project.main.project_id}" │ ├──────────────── │ │ data.google_project.main.project_id is null │ │ The expression result is null. Cannot include a null value in a string template. ╵ ``` ### Steps to Reproduce Create the dummy module as `main.tf` and the test as `tests/base.tftest.hcl` 1. `terraform init` 2. `terraform test` ### Additional Context It's not super clear whether this is an problem with terraform or the provider or both, but it seems like something that should be systematically addressed. ### References _No response_ ### Generative AI / LLM assisted development? _No response_