fixing various unit tests on Windows that create abstract sockets

by now having them create file-based sockets on windows/darwin

Signed-off-by: Mark Rossetti <marosset@microsoft.com>

pkg/controlplane/apiserver/options/options_test.go

@@ -32,6 +32,7 @@ import (
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/spf13/pflag"
 	noopoteltrace "go.opentelemetry.io/otel/trace/noop"
+	utilnettesting "k8s.io/apimachinery/pkg/util/net/testing"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apiserver/pkg/admission"
 	apiserveroptions "k8s.io/apiserver/pkg/server/options"
@@ -483,7 +484,7 @@ func TestCompleteForServiceAccount(t *testing.T) {
 			options := NewOptions()
 			if tc.externalSigner {
 				// create and start mock signer.
-				socketPath := fmt.Sprintf("@mock-external-jwt-signer-%d.sock", time.Now().Nanosecond())
+				socketPath := utilnettesting.MakeSocketNameForTest(t, fmt.Sprintf("mock-external-jwt-signer-%d.sock", time.Now().Nanosecond()))
 				mockSigner := v1alpha1testing.NewMockSigner(t, socketPath)
 				defer mockSigner.CleanUp()
 

pkg/serviceaccount/externaljwt/plugin/keycache_test.go

@@ -20,7 +20,6 @@ import (
 	"context"
 	"fmt"
 	"net"
-	"os"
 	"strings"
 	"sync/atomic"
 	"testing"
@@ -35,6 +34,8 @@ import (
 	"k8s.io/apimachinery/pkg/util/wait"
 	externaljwtv1alpha1 "k8s.io/externaljwt/apis/v1alpha1"
 	"k8s.io/kubernetes/pkg/serviceaccount"
+
+	utilnettesting "k8s.io/apimachinery/pkg/util/net/testing"
 )
 
 func TestExternalPublicKeyGetter(t *testing.T) {
@@ -169,8 +170,7 @@ func TestExternalPublicKeyGetter(t *testing.T) {
 		t.Run(tc.desc, func(t *testing.T) {
 			ctx := context.Background()
 
-			sockname := fmt.Sprintf("@test-external-public-key-getter-%d-%d.sock", time.Now().Nanosecond(), i)
-			t.Cleanup(func() { _ = os.Remove(sockname) })
+			sockname := utilnettesting.MakeSocketNameForTest(t, fmt.Sprintf("test-external-public-key-getter-%d-%d.sock", time.Now().Nanosecond(), i))
 
 			addr := &net.UnixAddr{Name: sockname, Net: "unix"}
 			listener, err := net.ListenUnix(addr.Network(), addr)
@@ -240,8 +240,7 @@ func TestExternalPublicKeyGetter(t *testing.T) {
 func TestInitialFill(t *testing.T) {
 	ctx := context.Background()
 
-	sockname := fmt.Sprintf("@test-initial-fill-%d.sock", time.Now().Nanosecond())
-	t.Cleanup(func() { _ = os.Remove(sockname) })
+	sockname := utilnettesting.MakeSocketNameForTest(t, fmt.Sprintf("test-initial-fill-%d.sock", time.Now().Nanosecond()))
 
 	addr := &net.UnixAddr{Name: sockname, Net: "unix"}
 	listener, err := net.ListenUnix(addr.Network(), addr)
@@ -306,8 +305,7 @@ func TestInitialFill(t *testing.T) {
 func TestReflectChanges(t *testing.T) {
 	ctx := context.Background()
 
-	sockname := fmt.Sprintf("@test-reflect-changes-%d.sock", time.Now().Nanosecond())
-	t.Cleanup(func() { _ = os.Remove(sockname) })
+	sockname := utilnettesting.MakeSocketNameForTest(t, fmt.Sprintf("test-reflect-changes-%d.sock", time.Now().Nanosecond()))
 
 	addr := &net.UnixAddr{Name: sockname, Net: "unix"}
 	listener, err := net.ListenUnix(addr.Network(), addr)

pkg/serviceaccount/externaljwt/plugin/plugin_test.go

@@ -25,7 +25,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"net"
-	"os"
 	"strings"
 	"sync"
 	"testing"
@@ -39,6 +38,7 @@ import (
 
 	"k8s.io/kubernetes/pkg/serviceaccount"
 
+	utilnettesting "k8s.io/apimachinery/pkg/util/net/testing"
 	externaljwtv1alpha1 "k8s.io/externaljwt/apis/v1alpha1"
 )
 
@@ -258,8 +258,7 @@ func TestExternalTokenGenerator(t *testing.T) {
 		t.Run(tc.desc, func(t *testing.T) {
 			ctx := context.Background()
 
-			sockname := fmt.Sprintf("@test-external-token-generator-%d-%d.sock", time.Now().Nanosecond(), i)
-			t.Cleanup(func() { _ = os.Remove(sockname) })
+			sockname := utilnettesting.MakeSocketNameForTest(t, fmt.Sprintf("test-external-token-generator-%d-%d.sock", time.Now().Nanosecond(), i))
 
 			addr := &net.UnixAddr{Name: sockname, Net: "unix"}
 			listener, err := net.ListenUnix(addr.Network(), addr)

staging/src/k8s.io/apimachinery/pkg/util/net/testing/socket.go

@@ -0,0 +1,41 @@
+/*
+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 nettesting contains utilities for testing networking functionality.
+// Don't use these utilities in production code. They have not been security
+// reviewed.
+package nettesting
+
+import (
+	"os"
+	goruntime "runtime"
+	"testing"
+)
+
+// MakeSocketNameForTest returns a socket name to use for the duration of a test.
+// On Operating systems that support abstract sockets, it the name is prefixed with `@` to make it an abstract socket.
+// On Operating systems that do not support abstract sockets, the name is treated as a filename and a cleanup hook is
+// registered to delete the socket at the end of the test.
+func MakeSocketNameForTest(t testing.TB, name string) string {
+	var sockname = name
+	switch goruntime.GOOS {
+	case "darwin", "windows":
+		t.Cleanup(func() { _ = os.Remove(sockname) })
+	default:
+		sockname = "@" + name
+	}
+	return sockname
+}

test/integration/serviceaccount/external_jwt_signer_test.go

@@ -30,6 +30,7 @@ import (
 	authv1 "k8s.io/api/authentication/v1"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	utilnettesting "k8s.io/apimachinery/pkg/util/net/testing"
 	"k8s.io/apimachinery/pkg/util/wait"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/client-go/kubernetes"
@@ -61,7 +62,7 @@ func TestExternalJWTSigningAndAuth(t *testing.T) {
 	defer cancel()
 
 	// create and start mock signer.
-	socketPath := fmt.Sprintf("@mock-external-jwt-signer-%d.sock", time.Now().Nanosecond())
+	socketPath := utilnettesting.MakeSocketNameForTest(t, fmt.Sprintf("mock-external-jwt-signer-%d.sock", time.Now().Nanosecond()))
 	t.Cleanup(func() { _ = os.Remove(socketPath) })
 	mockSigner := v1alpha1testing.NewMockSigner(t, socketPath)
 	defer mockSigner.CleanUp()
@@ -277,7 +278,7 @@ func TestDelayedStartForSigner(t *testing.T) {
 	defer cancel()
 
 	// Schedule signer to start on socket after 20 sec
-	socketPath := "@mock-external-jwt-signer.sock"
+	socketPath := utilnettesting.MakeSocketNameForTest(t, "mock-external-jwt-signer.sock")
 	t.Cleanup(func() { _ = os.Remove(socketPath) })
 	go func() {
 		time.Sleep(20 * time.Second)