Reusable generic Terratest for all Azure based Terraform modules. https://markwarneke.me/2020-10-14-Generic-Terraform-Module-Test-Using-Terratest/

generic_test.go

package test
import (
	"fmt"
	"log"
	"math/rand"
	"os"
	"strings"
	"testing"
	"github.com/gruntwork-io/terratest/modules/terraform"
)
/**
	Creates a random name that is used for testing
	Create terraform options (similar to the terraform command line arguments), 
		references a static test.vars, that contains the configuration for the test
	Move provider.tf into the module (../)
	Runs terraform plan & terraform apply
	Move provider.tf back
	Run terraform destroy
**/

// Used for moving the provider.tf between tests
func moveFile(oldLocation, newLocation string) {
	err := os.Rename(oldLocation, newLocation)
	if err != nil {
		log.Panic(err)
	}
}

// Used for orchestrating the test
func TestTerraformVmWithGpuModule(t *testing.T) {
	// Save the location of the parent, SUT (subject under test)
	terraformDir := "../"
	
	// The original provider located in /$SUT/test/provider.tf
	originalLocation := "provider.tf"
	
	// Store position the providers has to be for testing in /$SUT/provider.tf
	underTestLocation := strings.Join([]string{terraformDir, originalLocation}, "")
	
	// Create a unique name based on a random id
	expectedName := fmt.Sprintf("t%d", rand.Intn(9999))
	
	terraformOptions := &terraform.Options{
		
		// The path to where our Terraform code is located in /$SUT
		TerraformDir: terraformDir,
		
		// Add variables via the test.vars file
		VarFiles: []string{"./test/test.vars"},
		
		// Variables to pass to our Terraform code using -var options
		Vars: map[string]interface{}{
			"name": expectedName,
		},
		
		// Disable colors in Terraform commands so its easier to parse stdout/stderr
		NoColor: false,
	}
	
	// defer: Move the provider _at the end_ of the test back to /$SUT/test
	defer moveFile(underTestLocation, originalLocation)
	
	// defer: At the end of the test, run `terraform destroy` to clean up the resources created
	defer terraform.Destroy(t, terraformOptions)
	
	// Move provider.tf from /$SUT/test/provider.tf to /$SUT/provider.tf
	moveFile(originalLocation, underTestLocation)
	
	// Is used mainly for debugging, fail early if plan is not possible
	terraform.InitAndPlan(t, terraformOptions)
	
	// This will run `terraform init` and `terraform apply`, fail the test if there are any errors
	terraform.InitAndApply(t, terraformOptions)
}

provider.tf

# Local provider for testing
provider "azurerm" {
  version = "=2.3.0"
  features {}
}

test.sh

# Source necessary TF environment variables
docker run --env-file .env -it -v ${PWD}:"/source" -w "/source" aztfmod/rover

cd $SUT

cd test

# Setup go module
go mod init 'github.com/aztfmod'

# Make sure to set an appropriate timeout
go test # -timeout 30m

test.vars

resource_group_name = "playground-test-resources"
location            = "WestEurope"

tags = {
  test = true
}