Testing Feature - Support overrides for data sources / resources / modules

[RLRabinowitz]

OpenTofu Version

1.6.0

Use Cases

Mocking can be very helpful and powerful when testing. In addition to the request to allow for mocking providers in tests, we should also be able to create more granular mocks, for specific resources / modules / data sources

Attempted Solutions

No way currently to mock specific resources / modules / data sources in test runs

Proposal

Create override_module, override_resource and override_data blocks, which could be defined globally in the test file / under the mock_provider block / under a run block, and could be used to completely override the module/resource/data source.

When using an override_module/override_resource/override_data, this module/resource/data wouldn't actually be created using the provider, it only immediately return with the values/outputs defined in the override block

override_resource {
  target = aws_s3_bucket.my_bucket
  values = {
    body = "my_text"
  }
}

override_data {
  target = data.aws_s3_bucket.my_bucket
  values = {
    body = "my_text"
  }
}

override_module {
  target = module.my_module
  outputs = {
    output1 = "my_output
  }
}

References

• Reference to docs of a similar ability in Terraform - https://developer.hashicorp.com/terraform/language/tests/mocking#overrides
• Related to