Add plan check for unset value

[stevehipwell]

terraform-plugin-testing version

v1.14.0

Use cases

I want to validate that a value hasn't been set in the plan.

Attempted solutions

None of the existing methods work, so I'd need to write a custom check function.

Proposal

please add support for plancheck.ExpectNoValue("resource.instance", "attribute"). This is a specific requirement for the plan check, as the state check uses the schema.

References