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2.5Pulumi vs Terraform Testing Comparison
| Aspect | Terraform | Pulumi |
|---|---|---|
| Unit test language | Go (Terratest) or Python (plan JSON) | Same language as infra (TS, Python, Go, C#) |
| Mock support | Limited (plan analysis) | Built-in mock framework |
| Policy framework | External (OPA, Checkov, tfsec) | Built-in (CrossGuard) |
| Integration tests | Terratest (Go only) | Automation API (any language) |
| Test speed (unit) | Fast (plan analysis) | Very fast (mocks, no cloud) |
| Test speed (integration) | Slow (real infra) | Slow (real infra) |
| Learning curve | Moderate (learn Go for Terratest) | Low (use your existing language) |
| Community tooling | Extensive (Terratest, Checkov, tfsec) | Growing (CrossGuard, native tests) |
Which to Choose
- If your team already uses Terraform and Go, Terratest is mature and well-documented.
- If your team uses TypeScript or Python, Pulumi's native testing is significantly lower friction.
- If you need organization-wide policy enforcement, Pulumi CrossGuard offers a more integrated experience than bolting OPA onto Terraform.
- Regardless of choice, the testing principle is the same: static checks at the base, plan/preview analysis in the middle, real infrastructure at the top.