azurerm_windows_web_app_slot - FIX node version reset to "0.12.1" during update

internal/services/appservice/helpers/web_app_slot_schema.go

@@ -1153,7 +1153,8 @@ func (s *SiteConfigWindowsWebAppSlot) ExpandForUpdate(metadata sdk.ResourceMetaD
 
 	if len(s.ApplicationStack) == 1 {
 		winAppStack := s.ApplicationStack[0]
-		if metadata.ResourceData.HasChange("site_config.0.application_stack.0.node_version") {
+
+		if metadata.ResourceData.HasChange("site_config.0.application_stack.0.node_version") || winAppStack.NodeVersion != "" {
 			if appSettings == nil {
 				appSettings = make(map[string]string)
 			}

internal/services/appservice/windows_web_app_slot_resource.go

@@ -896,7 +896,7 @@ func (r WindowsWebAppSlotResource) Update() sdk.ResourceFunc {
 			}
 
 			// (@jackofallops) - App Settings can clobber logs configuration so must be updated before we send any Log updates
-			if metadata.ResourceData.HasChanges("app_settings", "site_config") || metadata.ResourceData.HasChange("site_config.0.health_check_eviction_time_in_min") || metadata.ResourceData.HasChange("site_config.0.application_stack.0.node_version") {
+			if metadata.ResourceData.HasChanges("app_settings", "site_config") || metadata.ResourceData.HasChange("site_config.0.health_check_eviction_time_in_min") {
 				appSettingsUpdate := helpers.ExpandAppSettingsForUpdate(model.Properties.SiteConfig.AppSettings)
 				appSettingsProps := *appSettingsUpdate.Properties
 				appSettingsProps["WEBSITE_HEALTHCHECK_MAXPINGFAILURES"] = strconv.Itoa(int(state.SiteConfig[0].HealthCheckEvictionTime))

internal/services/appservice/windows_web_app_slot_resource_test.go

@@ -784,6 +784,14 @@ func TestAccWindowsWebAppSlot_withNode12(t *testing.T) {
 			),
 		},
 		data.ImportStep("site_credential.0.password"),
+		{
+			Config: r.nodeWithAppSettings(data, "~12"),
+			Check: acceptance.ComposeTestCheckFunc(
+				check.That(data.ResourceName).ExistsInAzure(r),
+				check.That(data.ResourceName).Key("site_config.0.application_stack.0.node_version").HasValue("~12"),
+			),
+		},
+		data.ImportStep("site_credential.0.password"),
 	})
 }
 
@@ -799,6 +807,14 @@ func TestAccWindowsWebAppSlot_withNode14(t *testing.T) {
 			),
 		},
 		data.ImportStep("site_credential.0.password"),
+		{
+			Config: r.nodeWithAppSettings(data, "~14"),
+			Check: acceptance.ComposeTestCheckFunc(
+				check.That(data.ResourceName).ExistsInAzure(r),
+				check.That(data.ResourceName).Key("site_config.0.application_stack.0.node_version").HasValue("~14"),
+			),
+		},
+		data.ImportStep("site_credential.0.password"),
 	})
 }
 
@@ -814,6 +830,14 @@ func TestAccWindowsWebAppSlot_withNode18(t *testing.T) {
 			),
 		},
 		data.ImportStep("site_credential.0.password"),
+		{
+			Config: r.nodeWithAppSettings(data, "~18"),
+			Check: acceptance.ComposeTestCheckFunc(
+				check.That(data.ResourceName).ExistsInAzure(r),
+				check.That(data.ResourceName).Key("site_config.0.application_stack.0.node_version").HasValue("~18"),
+			),
+		},
+		data.ImportStep("site_credential.0.password"),
 	})
 }
 
@@ -829,6 +853,14 @@ func TestAccWindowsWebAppSlot_withNode20(t *testing.T) {
 			),
 		},
 		data.ImportStep("site_credential.0.password"),
+		{
+			Config: r.nodeWithAppSettings(data, "~20"),
+			Check: acceptance.ComposeTestCheckFunc(
+				check.That(data.ResourceName).ExistsInAzure(r),
+				check.That(data.ResourceName).Key("site_config.0.application_stack.0.node_version").HasValue("~20"),
+			),
+		},
+		data.ImportStep("site_credential.0.password"),
 	})
 }
 
@@ -2035,6 +2067,33 @@ resource "azurerm_windows_web_app_slot" "test" {
   }
 }
 
+`, r.baseTemplate(data), data.RandomInteger, nodeVersion)
+}
+
+func (r WindowsWebAppSlotResource) nodeWithAppSettings(data acceptance.TestData, nodeVersion string) string {
+	return fmt.Sprintf(`
+provider "azurerm" {
+  features {}
+}
+
+%s
+
+resource "azurerm_windows_web_app_slot" "test" {
+  name           = "acctestWAS-%d"
+  app_service_id = azurerm_windows_web_app.test.id
+
+  app_settings = {
+    "foo" = "bar"
+  }
+
+  site_config {
+    application_stack {
+      node_version = "%s"
+    }
+  }
+}
+
+
 `, r.baseTemplate(data), data.RandomInteger, nodeVersion)
 }