{"agent":"claude","input":"Write terraform test files (.tftest.hcl) under tests/ for this VPC module. Use command = plan and a mock_provider for aws so they run with no AWS credentials. Cover the subnet count locals, CIDR math with cidrsubnet, each NAT gateway mode (single_nat_gateway, one_nat_gateway_per_az and the default), create_vpc = false creating nothing, and tags merging onto resources. Assert only on values known at plan time; pass availability zones as variables or override data sources. Keep required_version as it is. Run terraform init and terraform test, include the output, and open a pull request that lists each test and what it checks, and the Terraform version the tests need.","resources":[{"url":"https://github.com/your-org/your-app"}]}