diff --git a/pkg/cluster/connection_pooler_new_test.go b/pkg/cluster/connection_pooler_new_test.go
new file mode 100644
index 000000000..e562b540e
--- /dev/null
+++ b/pkg/cluster/connection_pooler_new_test.go
@@ -0,0 +1,58 @@
+package cluster
+
+import (
+	"testing"
+
+	"context"
+
+	appsv1 "k8s.io/api/apps/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	"k8s.io/apimachinery/pkg/labels"
+
+	"k8s.io/client-go/kubernetes/fake"
+
+	"github.com/zalando/postgres-operator/pkg/util/k8sutil"
+)
+
+func NewFakeKubernetesClient() k8sutil.KubernetesClient {
+	clientSet := fake.NewSimpleClientset()
+
+	return k8sutil.KubernetesClient{
+		SecretsGetter:     clientSet.CoreV1(),
+		ConfigMapsGetter:  clientSet.CoreV1(),
+		DeploymentsGetter: clientSet.AppsV1(),
+		ServicesGetter:    clientSet.CoreV1(),
+	}
+}
+
+func TestFakeClient(t *testing.T) {
+	clientSet := fake.NewSimpleClientset()
+	namespace := "default"
+
+	l := labels.Set(map[string]string{
+		"application": "spilo",
+	})
+
+	deployment := &appsv1.Deployment{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "my-deployment1",
+			Namespace: namespace,
+			Labels:    l,
+		},
+	}
+
+	clientSet.AppsV1().Deployments(namespace).Create(context.TODO(), deployment, metav1.CreateOptions{})
+
+	deployment2, _ := clientSet.AppsV1().Deployments(namespace).Get(context.TODO(), "my-deployment1", metav1.GetOptions{})
+
+	if deployment.ObjectMeta.Name != deployment2.ObjectMeta.Name {
+		t.Errorf("Deployments are not equal")
+	}
+
+	deployments, _ := clientSet.AppsV1().Deployments(namespace).List(context.TODO(), metav1.ListOptions{LabelSelector: "application=spilo"})
+
+	if len(deployments.Items) != 1 {
+		t.Errorf("Label search does not work")
+	}
+}