better error message for unit test with missing input

[graciegoheen]

Is this your first time submitting a feature request?

• I have read the expectations for open source contributors
• I have searched the existing issues, and I could not find an existing issue for this feature
• I am requesting a straightforward extension of existing dbt functionality, rather than a Big Idea better suited to a discussion

Describe the feature

Originally from @gwenwindflower:

could i suggest a slight rewording here to make it clear you mean the node hasn't been fixturized ?

Current error message:

Suggestion for improvement:
Depends on a given input called stg_customers which was not provided. or something along those lines

That would:

• utilize the name of the key that's missing in your YAML config
• keeping the language consistent (i think using the word fixture might be too far and confuse those unfamiliar with unit tests) with the code
• while shading the potential meaning away from 'missing node' which to me makes me think about the DAG.

put another way, i think this error totally makes sense if you understand how unit tests work under-the-hood, but we could perhaps optimize it more towards the unit test user vs. the underlying mechanics?

Describe alternatives you've considered

No response

Who will this benefit?

No response

Are you interested in contributing this feature?

No response

Anything else?

No response

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[github-actions]

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