terraform-test

Comprehensive guide for writing and running Terraform tests. Use when creating test files (.tftest.hcl), writing test scenarios with run blocks, validating infrastructure behavior with assertions, mocking providers and data sources, testing module outputs and resource configurations, or troubleshooting Terraform test syntax and execution.

Install with Tessl CLI

npx tessl i github:hashicorp/agent-skills --skill terraform-test

What are skills?

1.78x

Quality

88%

Does it follow best practices?

Impact

84%

1.78x

Average score across 10 eval scenarios

SKILL.md

Review

Evals

Evaluation results

100%

40%

Write Terraform Tests for an S3 Bucket Module Without Cloud Credentials

Mock provider and assert block syntax

Criteria

Without context

With context

mock_provider block

100%

mock_resource sub-block

100%

mock_data sub-block

100%

Assert condition field

100%

Assert error_message field

100%

60%

Write Terraform Tests for an EC2 Module

Expect failures and variable overrides

Criteria

Without context

With context

expect_failures attribute

100%

Checkable object reference

100%

File-level variables block

Run-level variable override

Plan mode for validation

100%

Write Terraform Tests for a Multi-Module Network Stack

Module block testing and run output references

Criteria

Without context

With context

Module block with source

100%

Run output reference syntax

100%

Sequential dependency order

100%

Multiple run blocks

100%

tftest.hcl extension

100%

95%

Write a Complete Test Suite for an IAM Role Module

Test file organization and plan vs apply modes

Criteria

Without context

With context

Tests directory

66%

Unit test naming

100%

Integration test naming

100%

Plan mode explicit

100%

Apply mode default

100%

65%

50%

Write Terraform Tests for a Multi-Module Infrastructure Platform

State key management and parallel execution

Criteria

Without context

With context

state_key attribute used

100%

parallel attribute set

Separate state for parallel

50%

Synchronization point

33%

100%

No cross-parallel references

66%

100%

Evaluated: 27 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Write Terraform Tests for an S3 Bucket Module Without Cloud Credentials Write Terraform Tests for an EC2 Module Write Terraform Tests for a Multi-Module Network Stack Write a Complete Test Suite for an IAM Role Module Write Terraform Tests for a Multi-Module Infrastructure Platform

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