Compatibility Testing Pulumi HCL

Pulumi HCL aims to ensure that HCL programs compatible with OpenTofu produce equivalent results when run through Pulumi, enabling shared Terraform modules and a clear correctness standard based on matching provider operations and stack outputs. Its tfcompat testing framework runs the same HCL scenario against OpenTofu and Pulumi in parallel using in-memory Terraform providers, captures provider gRPC calls and outputs, and passes only when both systems perform identical observable actions. Because tests specify scenarios rather than manually defined expected behavior, they can reliably detect real compatibility divergences. This approach also makes LLM-assisted bug discovery practical: models can generate failing tfcompat cases that demonstrate genuine differences between Pulumi HCL and OpenTofu, reducing false positives and supporting large-scale testing. The method applies to the subset of Pulumi HCL accepted by OpenTofu, while Pulumi HCL itself supports a broader language superset.

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