func (s) TestUnix(t *testing.T) {
	for _, test := range authorityTests {
		t.Run(test.name, func(t *testing.T) {
			runUnixTest(t, test.address, test.target, test.authority, nil)
		})
	}
}
TestUnix does end to end tests with the various supported unix target
formats, ensuring that the authority is set as expected.
package test
import (
	"context"
	"fmt"
	"net"
	"os"
	"strings"
	"sync"
	"testing"
	"time"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/internal/stubserver"
	"google.golang.org/grpc/metadata"
	"google.golang.org/grpc/status"
	testpb "google.golang.org/grpc/test/grpc_testing"
)
func authorityChecker(ctx context.Context, expectedAuthority string) (*testpb.Empty, error) {
	md, ok := metadata.FromIncomingContext(ctx)
	if !ok {
		return nil, status.Error(codes.InvalidArgument, "failed to parse metadata")
	}
	auths, ok := md[":authority"]
	if !ok {
		return nil, status.Error(codes.InvalidArgument, "no authority header")
	}
	if len(auths) != 1 {
		return nil, status.Error(codes.InvalidArgument, fmt.Sprintf("no authority header, auths = %v", auths))
	}
	if auths[0] != expectedAuthority {
		return nil, status.Error(codes.InvalidArgument, fmt.Sprintf("invalid authority header %v, expected %v", auths[0], expectedAuthority))
	}
	return &testpb.Empty{}, nil
}
func runUnixTest(t *testing.T, address, target, expectedAuthority string, dialer func(context.Context, string) (net.Conn, error)) {
	if !strings.HasPrefix(target, "unix-abstract:") {
		if err := os.RemoveAll(address); err != nil {
			t.Fatalf("Error removing socket file %v: %v\n", address, err)
		}
	}
	ss := &stubserver.StubServer{
		EmptyCallF: func(ctx context.Context, _ *testpb.Empty) (*testpb.Empty, error) {
			return authorityChecker(ctx, expectedAuthority)
		},
		Network: "unix",
		Address: address,
		Target:  target,
	}
	opts := []grpc.DialOption{}
	if dialer != nil {
		opts = append(opts, grpc.WithContextDialer(dialer))
	}
	if err := ss.Start(nil, opts...); err != nil {
		t.Fatalf("Error starting endpoint server: %v", err)
	}
	defer ss.Stop()
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	_, err := ss.Client.EmptyCall(ctx, &testpb.Empty{})
	if err != nil {
		t.Errorf("us.client.EmptyCall(_, _) = _, %v; want _, nil", err)
	}
}
type authorityTest struct {
	name           string
	address        string
	target         string
	authority      string
	dialTargetWant string
}
var authorityTests = []authorityTest{
	{
		name:      "UnixRelative",
		address:   "sock.sock",
		target:    "unix:sock.sock",
		authority: "localhost",
	},
	{
		name:           "UnixAbsolute",
		address:        "/tmp/sock.sock",
		target:         "unix:/tmp/sock.sock",
		authority:      "localhost",
		dialTargetWant: "unix:///tmp/sock.sock",
	},
	{
		name:      "UnixAbsoluteAlternate",
		address:   "/tmp/sock.sock",
		target:    "unix:///tmp/sock.sock",
		authority: "localhost",
	},
	{
		name:           "UnixPassthrough",
		address:        "/tmp/sock.sock",
		target:         "passthrough:///unix:///tmp/sock.sock",
		authority:      "unix:///tmp/sock.sock",
		dialTargetWant: "unix:///tmp/sock.sock",
	},
	{
		name:           "UnixAbstract",
		address:        "\x00abc efg",
		target:         "unix-abstract:abc efg",
		authority:      "localhost",
		dialTargetWant: "\x00abc efg",
	},
}