Fix appset tests

Signed-off-by: Adrian Aneci <aneci@adobe.com>

applicationset/controllers/applicationset_controller_test.go

@@ -677,7 +677,7 @@ func TestCreateOrUpdateInCluster(t *testing.T) {
 					},
 					Spec: v1alpha1.ApplicationSpec{
 						Project: "project",
-						Source: &v1alpha1.ApplicationSource{
+						Source:  &v1alpha1.ApplicationSource{
 							// Directory and jsonnet block are removed
 						},
 					},

applicationset/utils/clusterUtils_test.go

@@ -10,6 +10,7 @@ import (
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/kubernetes/fake"
 	kubetesting "k8s.io/client-go/testing"
 
@@ -93,6 +94,15 @@ func TestValidateDestination(t *testing.T) {
 			Namespace: "default",
 		}
 
+		// Save current function and restore at the end:
+		oldListClustersFunc := ListClustersFunc
+		defer func() { ListClustersFunc = oldListClustersFunc }()
+
+		testCluster := argoappv1.Cluster{Server: "https://127.0.0.1:6443", Name: "test-cluster"}
+		ListClustersFunc = func(ctx context.Context, clientset kubernetes.Interface, namespace string) (*argoappv1.ClusterList, error) {
+			return &argoappv1.ClusterList{Items: []argoappv1.Cluster{testCluster}}, nil
+		}
+
 		appCond := ValidateDestination(context.Background(), &dest, nil, fakeNamespace)
 		require.NoError(t, appCond)
 		assert.False(t, dest.IsServerInferred())