chore: change region used in online archive process region to one supported in cloud dev (#1703)

* chore: change region used in online archive process region to one supported in cloud dev

* add test for case when unkown region is provided

Author: AgustinBettati

mongodbatlas/resource_online_archive_test.go

@@ -179,6 +179,7 @@ func TestAccBackupRSOnlineArchiveWithProcessRegion(t *testing.T) {
 		projectName                 = acctest.RandomWithPrefix("test-acc")
 		name                        = fmt.Sprintf("test-acc-%s", acctest.RandString(10))
 		cloudProvider               = "AWS"
+		processRegion               = "US_EAST_1"
 	)
 
 	resource.ParallelTest(t, resource.TestCase{
@@ -195,12 +196,12 @@ func TestAccBackupRSOnlineArchiveWithProcessRegion(t *testing.T) {
 				),
 			},
 			{
-				Config: testAccBackupRSOnlineArchiveConfigWithProcessRegion(orgID, projectName, name, cloudProvider, "SA_EAST_1"),
+				Config: testAccBackupRSOnlineArchiveConfigWithProcessRegion(orgID, projectName, name, cloudProvider, processRegion),
 				Check: resource.ComposeTestCheckFunc(
-					resource.TestCheckResourceAttr(onlineArchiveResourceName, "data_process_region.0.cloud_provider", "AWS"),
-					resource.TestCheckResourceAttr(onlineArchiveResourceName, "data_process_region.0.region", "SA_EAST_1"),
-					resource.TestCheckResourceAttr(onlineArchiveDataSourceName, "data_process_region.0.cloud_provider", "AWS"),
-					resource.TestCheckResourceAttr(onlineArchiveDataSourceName, "data_process_region.0.region", "SA_EAST_1"),
+					resource.TestCheckResourceAttr(onlineArchiveResourceName, "data_process_region.0.cloud_provider", cloudProvider),
+					resource.TestCheckResourceAttr(onlineArchiveResourceName, "data_process_region.0.region", processRegion),
+					resource.TestCheckResourceAttr(onlineArchiveDataSourceName, "data_process_region.0.cloud_provider", cloudProvider),
+					resource.TestCheckResourceAttr(onlineArchiveDataSourceName, "data_process_region.0.region", processRegion),
 				),
 			},
 			{
@@ -210,14 +211,35 @@ func TestAccBackupRSOnlineArchiveWithProcessRegion(t *testing.T) {
 			{
 				Config: testAccBackupRSOnlineArchiveConfigWithoutSchedule(orgID, projectName, name),
 				Check: resource.ComposeTestCheckFunc(
-					resource.TestCheckResourceAttr(onlineArchiveResourceName, "data_process_region.0.cloud_provider", "AWS"),
-					resource.TestCheckResourceAttr(onlineArchiveResourceName, "data_process_region.0.region", "SA_EAST_1"),
+					resource.TestCheckResourceAttr(onlineArchiveResourceName, "data_process_region.0.cloud_provider", cloudProvider),
+					resource.TestCheckResourceAttr(onlineArchiveResourceName, "data_process_region.0.region", processRegion),
 				),
 			},
 		},
 	})
 }
 
+func TestAccBackupRSOnlineArchiveInvalidProcessRegion(t *testing.T) {
+	var (
+		orgID         = os.Getenv("MONGODB_ATLAS_ORG_ID")
+		projectName   = acctest.RandomWithPrefix("test-acc")
+		name          = fmt.Sprintf("test-acc-%s", acctest.RandString(10))
+		cloudProvider = "AWS"
+	)
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:                 func() { acc.PreCheckBasic(t) },
+		ProtoV6ProviderFactories: acc.TestAccProviderV6Factories,
+		CheckDestroy:             acc.CheckClusterDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config:      testAccBackupRSOnlineArchiveConfigWithProcessRegion(orgID, projectName, name, cloudProvider, "UNKNOWN"),
+				ExpectError: regexp.MustCompile("INVALID_ATTRIBUTE"),
+			},
+		},
+	})
+}
+
 func populateWithSampleData(resourceName string, cluster *matlas.Cluster) resource.TestCheckFunc {
 	return func(s *terraform.State) error {
 		conn := acc.TestMongoDBClient.(*config.MongoDBClient).Atlas