test(module): really test the generated access key

infrastructure/tofu/main.tf

@@ -11,28 +11,20 @@ module "aws_iam_ci_user" {
   source = "git::ssh://git@git.adyxax.org/adyxax/tofu-module-aws-iam-ci-user?depth=1&ref=1.0.1"
 
   name = local.name
-}
-
-resource "aws_iam_policy" "tftest" {
-  provider = aws.all["root"]
-
-  name = "${local.name}-tftest"
-  policy = jsonencode({
-    Statement = [{
+  tests_policy_statements = jsonencode([
+    {
       Action = "iam:*"
       Effect = "Allow"
       Resource = [
         "arn:aws:iam::*:user/tftest-user",
         "arn:aws:iam::*:policy/${local.name}-tftest",
       ]
-    }]
-    Version = "2012-10-17"
-  })
+    },
+    {
+      # Necessary for removing an IAM user
+      Action   = "iam:ListVirtualMFADevices",
+      Effect   = "Allow"
+      Resource = "*"
     }
-
-resource "aws_iam_user_policy_attachment" "tftest" {
-  provider = aws.all["root"]
-
-  policy_arn = aws_iam_policy.tftest.arn
-  user       = local.name
+  ])
 }

main.tftest.hcl

@@ -1,15 +1,14 @@
 provider "aws" {
-  profile = "root"
+  profile = "tests"
   region  = "eu-west-3"
 }
 
 run "main" {
   assert {
-    condition     = output.access_key_id != null
-    error_message = "invalid IAM access key ID"
+    condition     = data.external.main.result.Arn == local.expected_arn
+    error_message = "user ARN mismatch"
+  }
+  module {
+    source = "./test"
   }
 }
-
-variables {
-  name = "tftest-user"
-}

test/aws_config.tftpl

@@ -0,0 +1,4 @@
+[default]
+aws_access_key_id = ${aws_access_key_id}
+aws_secret_access_key = ${aws_access_key_secret}
+region = eu-west-3

test/main.tf

@@ -0,0 +1,31 @@
+module "main" {
+  source = "../"
+
+  name = "tftest-user"
+}
+
+data "aws_caller_identity" "current" {}
+
+# tflint-ignore: terraform_unused_declarations
+data "external" "main" {
+  program = ["${path.module}/test.sh"]
+
+  depends_on = [local_file.aws_config]
+}
+
+locals {
+  # tflint-ignore: terraform_unused_declarations
+  expected_arn = format(
+    "arn:aws:iam::%s:user/tftest-user",
+    data.aws_caller_identity.current.account_id,
+  )
+}
+
+resource "local_file" "aws_config" {
+  filename        = "${path.module}/aws_config"
+  file_permission = "0600"
+  content = templatefile("${path.module}/aws_config.tftpl", {
+    aws_access_key_id     = module.main.access_key_id
+    aws_access_key_secret = module.main.access_key_secret
+  })
+}

test/providers.tf

@@ -0,0 +1,15 @@
+terraform {
+  required_providers {
+    aws = {
+      source = "hashicorp/aws"
+    }
+    external = {
+      source  = "hashicorp/external"
+      version = "2.3.4"
+    }
+    local = {
+      source  = "hashicorp/local"
+      version = "2.5.2"
+    }
+  }
+}

test/test.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Wait a bit for the ACCESS KEY to be usable on AWS
+sleep 10
+
+export AWS_CONFIG_FILE="${PWD}/test/aws_config"
+aws sts get-caller-identity