Developed a feature for the pulumi/opentofu repository that enables function calls within test variable definitions in the OpenTofu CLI, allowing for more dynamic and expressive test data. This work involved expanding the evaluation context to include available functions such as upper and join, which reduces the need for manual test data setup and supports richer test scenarios. Addressed a related issue to ensure function calls in test variable blocks operate reliably, minimizing flaky test setups. The implementation leveraged Go for CLI development and HCL for configuration language support, with a focus on robust testing to validate the new functionality.