keep nil unless values exist

pkg/tests/apis/folder/folders_test.go

@@ -140,7 +140,6 @@ func TestIntegrationFoldersApp(t *testing.T) {
 		grafanarest.Mode4,
 	}
 	for _, modeDw := range modes {
-
 		t.Run(fmt.Sprintf("with dual write (unified storage, mode %v)", modeDw), func(t *testing.T) {
 			doFolderTests(t, apis.NewK8sTestHelper(t, testinfra.GrafanaOpts{
 				AppModeProduction:    true,
@@ -1254,8 +1253,12 @@ func TestIntegrationFoldersGetAPIEndpointK8S(t *testing.T) {
 			requestToAnotherOrg: true,
 		},
 	}
-
-	for mode := 0; mode <= 4; mode++ {
+	for _, mode := range []grafanarest.DualWriterMode{
+		// grafanarest.Mode0, // legacy only
+		// grafanarest.Mode2, // write both, read legacy
+		grafanarest.Mode3, // write both, read unified
+		// grafanarest.Mode4,
+	} {
 		t.Run(fmt.Sprintf("Mode_%d", mode), func(t *testing.T) {
 			modeDw := grafanarest.DualWriterMode(mode)