azurerm_function_app - make pre_warmed_instance_count computed to use azure's default

azurerm/internal/services/web/function_app.go

@@ -68,6 +68,7 @@ func schemaAppServiceFunctionAppSiteConfig() *schema.Schema {
 				"pre_warmed_instance_count": {
 					Type:         schema.TypeInt,
 					Optional:     true,
+					Default:      1,
 					ValidateFunc: validation.IntBetween(0, 10),
 				},
 

azurerm/internal/services/web/tests/resource_arm_function_app_test.go

@@ -746,6 +746,26 @@ func TestAccAzureRMFunctionApp_preWarmedInstanceCount(t *testing.T) {
 	})
 }
 
+func TestAccAzureRMFunctionApp_defaultPreWarmedInstanceCount(t *testing.T) {
+	data := acceptance.BuildTestData(t, "azurerm_function_app", "test")
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:     func() { acceptance.PreCheck(t) },
+		Providers:    acceptance.SupportedProviders,
+		CheckDestroy: testCheckAzureRMFunctionAppDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccAzureRMFunctionApp_defaultPreWarmedInstanceCount(data),
+				Check: resource.ComposeTestCheckFunc(
+					testCheckAzureRMFunctionAppExists(data.ResourceName),
+					resource.TestCheckResourceAttr(data.ResourceName, "site_config.0.pre_warmed_instance_count", "1"),
+				),
+			},
+			data.ImportStep(),
+		},
+	})
+}
+
 func TestAccAzureRMFunctionApp_oneIpRestriction(t *testing.T) {
 	data := acceptance.BuildTestData(t, "azurerm_function_app", "test")
 
@@ -2421,6 +2441,47 @@ resource "azurerm_function_app" "test" {
 `, data.RandomInteger, data.Locations.Primary, data.RandomString, data.RandomInteger, data.RandomInteger)
 }
 
+func testAccAzureRMFunctionApp_defaultPreWarmedInstanceCount(data acceptance.TestData) string {
+	return fmt.Sprintf(`
+provider "azurerm" {
+  features {}
+}
+
+resource "azurerm_resource_group" "test" {
+  name     = "acctestRG-%d"
+  location = "%s"
+}
+
+resource "azurerm_storage_account" "test" {
+  name                     = "acctestsa%s"
+  resource_group_name      = azurerm_resource_group.test.name
+  location                 = azurerm_resource_group.test.location
+  account_tier             = "Standard"
+  account_replication_type = "LRS"
+}
+
+resource "azurerm_app_service_plan" "test" {
+  name                = "acctestASP-%d"
+  resource_group_name = azurerm_resource_group.test.name
+  location            = azurerm_resource_group.test.location
+  kind                = "elastic"
+
+  sku {
+    tier = "ElasticPremium"
+    size = "EP1"
+  }
+}
+
+resource "azurerm_function_app" "test" {
+  name                      = "acctest-%d-func"
+  location                  = azurerm_resource_group.test.location
+  resource_group_name       = azurerm_resource_group.test.name
+  app_service_plan_id       = azurerm_app_service_plan.test.id
+  storage_connection_string = azurerm_storage_account.test.primary_connection_string
+}
+`, data.RandomInteger, data.Locations.Primary, data.RandomString, data.RandomInteger, data.RandomInteger)
+}
+
 func testAccAzureRMFunctionApp_oneIpRestriction(data acceptance.TestData) string {
 	return fmt.Sprintf(`
 provider "azurerm" {