Test or TestAccResourceMongoDBAtlasDatabaseUser_withAWSIAMType with (#432)

* Test or TestAccResourceMongoDBAtlasDatabaseUser_withAWSIAMType with
import

1. Why is this change necessary?
Test for a import is a nice to have

2. How does it address the issue?
Test the function with the import for a matching scenario

3. What side effects does this change have?
None known

* username set in env var

1. Why is this change necessary?
Modular testing

2. How does it address the issue?
Make the username variable in that particular test dependentant on a env
var

3. What side effects does this change have?
None

Author: pitakill

mongodbatlas/resource_mongodbatlas_database_user_test.go

@@ -148,6 +148,47 @@ func TestAccResourceMongoDBAtlasDatabaseUser_withAWSIAMType(t *testing.T) {
 	})
 }
 
+func TestAccResourceMongoDBAtlasDatabaseUser_withAWSIAMType_import(t *testing.T) {
+	var (
+		dbUser       matlas.DatabaseUser
+		resourceName = "mongodbatlas_database_user.test"
+		username     = os.Getenv("TEST_DB_USER_IAM_ARN")
+		orgID        = os.Getenv("MONGODB_ATLAS_ORG_ID")
+		projectName  = acctest.RandomWithPrefix("test-acc")
+	)
+
+	if username == "" {
+		username = "arn:aws:iam::358363220050:user/mongodb-aws-iam-auth-test-user"
+	}
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckMongoDBAtlasDatabaseUserDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccMongoDBAtlasDatabaseUserWithAWSIAMTypeConfig(projectName, orgID, "atlasAdmin", username, "First Key", "First value"),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckMongoDBAtlasDatabaseUserExists(resourceName, &dbUser),
+					testAccCheckMongoDBAtlasDatabaseUserAttributes(&dbUser, username),
+					resource.TestCheckResourceAttrSet(resourceName, "project_id"),
+					resource.TestCheckResourceAttr(resourceName, "username", username),
+					resource.TestCheckResourceAttr(resourceName, "aws_iam_type", "USER"),
+					resource.TestCheckResourceAttr(resourceName, "auth_database_name", "$external"),
+					resource.TestCheckResourceAttr(resourceName, "labels.#", "1"),
+				),
+			},
+			{
+				ResourceName:            resourceName,
+				ImportStateIdFunc:       testAccCheckMongoDBAtlasDatabaseUserImportStateIDFunc(resourceName),
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"password"},
+			},
+		},
+	})
+}
+
 func TestAccResourceMongoDBAtlasDatabaseUser_WithLabels(t *testing.T) {
 	var (
 		dbUser       matlas.DatabaseUser