Replaces it with the updated list-compatible syntax

.github/workflows/terratest.yml

@@ -0,0 +1,32 @@
+name: Terratest
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  terratest:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.20'
+
+      - name: Install dependencies
+        run: |
+          cd test
+          go mod tidy
+
+      - name: Run Terratest
+        run: |
+          cd test
+          go test -v

src/modules/postgresql-user/main.tf

@@ -2,7 +2,7 @@ locals {
   enabled = module.this.enabled
 
   db_user     = length(var.db_user) > 0 ? var.db_user : var.service_name
-  db_password = length(var.db_password) > 0 ? var.db_password : join("", random_password.db_password.*.result)
+  db_password = length(var.db_password) > 0 ? var.db_password : join("", random_password.db_password[*].result)
 
   save_password_in_ssm = local.enabled && var.save_password_in_ssm
 
@@ -45,7 +45,7 @@ resource "postgresql_role" "default" {
 # Apply the configured grants to the user
 resource "postgresql_grant" "default" {
   count       = local.enabled ? length(var.grants) : 0
-  role        = join("", postgresql_role.default.*.name)
+  role        = join("", postgresql_role.default[*].name)
   database    = var.grants[count.index].db
   schema      = var.grants[count.index].schema
   object_type = var.grants[count.index].object_type

src/outputs.tf

@@ -17,3 +17,9 @@ output "additional_grants" {
   value       = keys(module.additional_grants)
   description = "Additional grants"
 }
+
+# Add a Hello World output for Terratest
+output "hello_world" {
+  value       = "Hello, Terratest!"
+  description = "A simple Hello World output for Terratest validation."
+}

test/hello_world_test.go

@@ -0,0 +1,29 @@
+package test
+
+import (
+    "testing"
+
+    "github.com/gruntwork-io/terratest/modules/terraform"
+    "github.com/stretchr/testify/assert"
+)
+
+func TestHelloWorld(t *testing.T) {
+    t.Parallel()
+
+    // Define Terraform options
+    terraformOptions := &terraform.Options{
+        TerraformDir: "../", // Path to the Terraform module directory
+    }
+
+    // Clean up resources at the end
+    defer terraform.Destroy(t, terraformOptions)
+
+    // Initialize and apply Terraform
+    terraform.InitAndApply(t, terraformOptions)
+
+    // Retrieve the "hello_world" output
+    helloWorldOutput := terraform.Output(t, terraformOptions, "hello_world")
+
+    // Validate the output
+    assert.Equal(t, "Hello, Terratest!", helloWorldOutput, "Output does not match expected value")
+}