Fixing EndpointSlice port validation

This updates EndpointSlice port validation to mirror the validation
already in use for Service and Endpoint ports. This is required to
ensure all valid Service ports can be mapped directly to EndpointSlice
ports.

pkg/apis/discovery/validation/validation_test.go

@@ -18,6 +18,7 @@ package validation
 
 import (
 	"fmt"
+	"strings"
 	"testing"
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -104,6 +105,20 @@ func TestValidateEndpointSlice(t *testing.T) {
 				}},
 			},
 		},
+		"long-port-name": {
+			expectedErrors: 0,
+			endpointSlice: &discovery.EndpointSlice{
+				ObjectMeta:  standardMeta,
+				AddressType: addressTypePtr(discovery.AddressTypeIP),
+				Ports: []discovery.EndpointPort{{
+					Name:     utilpointer.StringPtr(strings.Repeat("a", 63)),
+					Protocol: protocolPtr(api.ProtocolTCP),
+				}},
+				Endpoints: []discovery.Endpoint{{
+					Addresses: generateIPAddresses(1),
+				}},
+			},
+		},
 		"empty-ports-and-endpoints": {
 			expectedErrors: 0,
 			endpointSlice: &discovery.EndpointSlice{
@@ -200,6 +215,18 @@ func TestValidateEndpointSlice(t *testing.T) {
 				Endpoints: []discovery.Endpoint{},
 			},
 		},
+		"bad-port-name-length": {
+			expectedErrors: 1,
+			endpointSlice: &discovery.EndpointSlice{
+				ObjectMeta:  standardMeta,
+				AddressType: addressTypePtr(discovery.AddressTypeIP),
+				Ports: []discovery.EndpointPort{{
+					Name:     utilpointer.StringPtr(strings.Repeat("a", 64)),
+					Protocol: protocolPtr(api.ProtocolTCP),
+				}},
+				Endpoints: []discovery.Endpoint{},
+			},
+		},
 		"invalid-port-protocol": {
 			expectedErrors: 1,
 			endpointSlice: &discovery.EndpointSlice{