# Terraform Testing Quick Start

## Quick Commands

```bash
# Run all tests
terraform test

# Run tests with verbose output
terraform test -verbose

# Check formatting
terraform fmt -check -recursive

# Auto-format all files
terraform fmt -recursive

# Validate configuration
terraform validate
```

## Pre-Commit Checklist

Before committing changes, ensure:

- [ ] Code is formatted: `terraform fmt -recursive`
- [ ] Configuration is valid: `terraform validate`
- [ ] All tests pass: `terraform test`
- [ ] No sensitive data is hardcoded

## Test File Locations

- `tests/resource_groups.tftest.hcl` - Default resource group tests
- `tests/custom_configuration.tftest.hcl` - Custom configuration tests
- `tests/variable_validation.tftest.hcl` - Variable validation tests

## Common Test Scenarios

### Adding a New Test

1. Choose the appropriate test file based on what you're testing
2. Add a new `run` block with a descriptive name
3. Use `command = plan` for most tests
4. Add assertions with clear error messages
5. Run the specific test to verify it works

Example:
```hcl
run "my_new_test" {
  command = plan

  variables {
    resource_groups = {
      test = { name = "Test" }
    }
  }

  assert {
    condition     = <your_condition>
    error_message = "Clear description of what failed"
  }
}
```

### Testing a Specific Feature

```bash
# Run specific test file
terraform test -filter=tests/custom_configuration.tftest.hcl

# Run with verbose output for debugging
terraform test -verbose -filter=tests/variable_validation.tftest.hcl
```

## CI/CD Pipeline

Tests run automatically on:
- Every push to master
- Every pull request

Pipeline order:
1. TFLint
2. Tfsec
3. Checkov
4. **Terraform Test** ⬅ Your tests
5. SonarQube
6. Terraform Init/Plan/Apply

## Troubleshooting

### Test Fails Locally But Not in CI

- Check Terraform version: `terraform version` (need >= 1.6.0)
- Ensure environment variables are not interfering
- Check for local `terraform.tfvars` overriding test values

### Test Fails in CI But Not Locally

- Review CI job output for environment-specific issues
- Verify mock credentials are properly set in CI
- Check for provider version mismatches

### Format Check Fails

```bash
# Fix automatically
terraform fmt -recursive

# Verify
terraform fmt -check -recursive
```

## Best Practices

1. **Write tests for new features**: Every new feature should have corresponding tests
2. **Test edge cases**: Include tests for empty values, minimum/maximum values, etc.
3. **Use descriptive names**: Test names should clearly indicate what they test
4. **Clear error messages**: Help future developers understand failures quickly
5. **Keep tests focused**: One test should verify one specific behavior

## Need Help?

- Full documentation: [TESTING.md](../TESTING.md)
- Terraform test docs: https://developer.hashicorp.com/terraform/language/tests
- Module README: [README.md](../README.md)