conformance: add test for optional address value (#3689)

* conformance: add test for optional address value

* fix: small resolutions after CR

* fix: CR Resolution 2

* fix: only overlay addresses if needed

* fix: conflict resolvement mistake

* fix: CR comments

Author: EyalPazz

conformance/tests/gateway-optional-address-value.go

@@ -0,0 +1,70 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+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 tests
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"k8s.io/apimachinery/pkg/types"
+
+	v1 "sigs.k8s.io/gateway-api/apis/v1"
+	"sigs.k8s.io/gateway-api/conformance/utils/kubernetes"
+	"sigs.k8s.io/gateway-api/conformance/utils/suite"
+	"sigs.k8s.io/gateway-api/pkg/features"
+)
+
+func init() {
+	ConformanceTests = append(ConformanceTests, GatewayOptionalAddressValue)
+}
+
+var GatewayOptionalAddressValue = suite.ConformanceTest{
+	ShortName:   "GatewayOptionalAddressValue",
+	Description: "Check Gateway Support for GatewayAddressEmpty feature",
+	Features: []features.FeatureName{
+		features.SupportGateway,
+		features.SupportGatewayAddressEmpty,
+	},
+	Provisional: true,
+	Manifests: []string{
+		"tests/gateway-optional-address-value.yaml",
+	},
+	Test: func(t *testing.T, s *suite.ConformanceTestSuite) {
+		ns := "gateway-conformance-infra"
+
+		kubernetes.NamespacesMustBeReady(t, s.Client, s.TimeoutConfig, []string{ns})
+
+		gwNN := types.NamespacedName{
+			Name:      "gateway-without-address-value",
+			Namespace: "gateway-conformance-infra",
+		}
+		ctx, cancel := context.WithTimeout(context.Background(), s.TimeoutConfig.DefaultTestTimeout)
+		defer cancel()
+
+		t.Logf("waiting for Gateway %s to be ready for testing", gwNN.Name)
+		kubernetes.GatewayMustHaveLatestConditions(t, s.Client, s.TimeoutConfig, gwNN)
+
+		t.Logf("retrieving Gateway %s/%s", gwNN.Namespace, gwNN.Name)
+		currentGW := &v1.Gateway{}
+		err := s.Client.Get(ctx, gwNN, currentGW)
+		require.NoError(t, err, "error getting Gateway: %v", err)
+		t.Logf("verifying that the Gateway %s/%s is accepted", gwNN.Namespace, gwNN.Name)
+		_, err = kubernetes.WaitForGatewayAddress(t, s.Client, s.TimeoutConfig, kubernetes.NewGatewayRef(gwNN, "http"))
+		require.NoError(t, err, "timed out waiting for Gateway address to be assigned")
+	},
+}

conformance/tests/gateway-optional-address-value.yaml

@@ -0,0 +1,13 @@
+apiVersion: gateway.networking.k8s.io/v1
+kind: Gateway
+metadata:
+  name: gateway-without-address-value
+  namespace: gateway-conformance-infra
+spec:
+  gatewayClassName: "{GATEWAY_CLASS_NAME}"
+  addresses:
+  - type: "IPAddress"
+  listeners:
+  - name: http
+    port: 8080
+    protocol: HTTP

conformance/utils/kubernetes/helpers.go

@@ -446,7 +446,7 @@ func WaitForGatewayAddress(t *testing.T, client client.Client, timeoutConfig con
 		}
 		port = strconv.FormatInt(int64(listener.Port), 10)
 		for _, address := range gw.Status.Addresses {
-			if address.Type != nil && (*address.Type == gatewayv1.IPAddressType || *address.Type == v1alpha2.HostnameAddressType) {
+			if address.Type != nil {
 				ipAddr = address.Value
 				return true, nil
 			}