add LabelFilter tests

cmd/main.go

@@ -87,10 +87,8 @@ func main() {
 	}
 
 	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
-		Scheme:  scheme,
-		Metrics: server.Options{BindAddress: metricsAddr},
-		//MetricsBindAddress:     metricsAddr,
-		//Port:                   9443,
+		Scheme:                 scheme,
+		Metrics:                server.Options{BindAddress: metricsAddr},
 		HealthProbeBindAddress: probeAddr,
 		LeaderElection:         enableLeaderElection,
 		// LeaderElectionID:       "",

internal/controller/service/helpers_test.go

@@ -0,0 +1,61 @@
+/*
+Copyright 2023.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import (
+	"reflect"
+	"testing"
+
+	corev1 "k8s.io/api/core/v1"
+)
+
+// TestBuildCNP_LabelFilter verifies that the label filter functions correctly
+// in accordance with Cilium's label rules. This test is based on the
+// Cilium documentation: https://github.com/cilium/cilium/blob/v1.15.8/Documentation/operations/performance/scalability/identity-relevant-labels.rst
+func TestBuildCNP_LabelFilter(t *testing.T) {
+
+	tests := []struct {
+		name    string
+		service *corev1.Service
+		given   map[string]string
+		want    map[string]string
+	}{
+
+		{name: "ShuoldNotBeFiltered",
+			given: map[string]string{"app": "test", "stack": "backend"},
+			want:  map[string]string{"k8s.app": "test", "k8s.stack": "backend"}},
+
+		{name: "ShuoldBeFiltered",
+			given: map[string]string{"statefulset.kubernetes.io/pod-name": "test", "stack": "backend"},
+			want:  map[string]string{"k8s.stack": "backend"}},
+
+		{name: "ShuoldBeFiltered",
+			given: map[string]string{"k8s.io/fake": "test", "stack": "backend"},
+			want:  map[string]string{"k8s.stack": "backend"}},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			re := &ReconcilerExtended{
+
+				service: &corev1.Service{Spec: corev1.ServiceSpec{Selector: tt.given}},
+			}
+			if got := re.buildCNP().Spec.EndpointSelector.MatchLabels; !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("ReconcilerExtended.buildCNP() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}