TestGenerateCatalogWithExternalNodes

[MichelleArk]

resolves #9481

Problem

No test for catalog generation for external nodes

Solution

Add TestGenerateCatalogWithExternalNodes

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[aranke]

LGTM, do we not want to port back the include_empty_nodes line?

[MichelleArk]

@aranke There's nowhere to port it to because 1.6.latest generate does not use a ResourceTypeSelector: https://github.com/dbt-labs/dbt-core/blob/1.6.latest/core/dbt/task/generate.py

This is not an issue in 1.6.latest, just putting a test in for good measure.