misc/cgo/testplugin/plugin_test.go - go - Git at Google

 // Copyright 2019 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

 package plugin_test

 import (
 	"bytes"
 	"context"
 	"flag"
 	"fmt"
 	"log"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
 	"testing"
 	"time"
 )

 var gcflags string = os.Getenv("GO_GCFLAGS")

 func TestMain(m *testing.M) {
 	flag.Parse()
 	if testing.Short() && os.Getenv("GO_BUILDER_NAME") == "" {
 		fmt.Printf("SKIP - short mode and $GO_BUILDER_NAME not set\n")
 		os.Exit(0)
 	}
 	log.SetFlags(log.Lshortfile)
 	os.Exit(testMain(m))
 }

 // tmpDir is used to cleanup logged commands -- s/tmpDir/$TMPDIR/
 var tmpDir string

 // prettyPrintf prints lines with tmpDir sanitized.
 func prettyPrintf(format string, args ...interface{}) {
 	s := fmt.Sprintf(format, args...)
 	if tmpDir != "" {
 		s = strings.ReplaceAll(s, tmpDir, "$TMPDIR")
 	}
 	fmt.Print(s)
 }

 func testMain(m *testing.M) int {
 	// Copy testdata into GOPATH/src/testplugin, along with a go.mod file
 	// declaring the same path.

 	GOPATH, err := os.MkdirTemp("", "plugin_test")
 	if err != nil {
 		log.Panic(err)
 	}
 	defer os.RemoveAll(GOPATH)
 	tmpDir = GOPATH

 	modRoot := filepath.Join(GOPATH, "src", "testplugin")
 	altRoot := filepath.Join(GOPATH, "alt", "src", "testplugin")
 	for srcRoot, dstRoot := range map[string]string{
 		"testdata":                           modRoot,
 		filepath.Join("altpath", "testdata"): altRoot,
 	} {
 		if err := overlayDir(dstRoot, srcRoot); err != nil {
 			log.Panic(err)
 		}
 		prettyPrintf("mkdir -p %s\n", dstRoot)
 		prettyPrintf("rsync -a %s/ %s\n", srcRoot, dstRoot)

 		if err := os.WriteFile(filepath.Join(dstRoot, "go.mod"), []byte("module testplugin\n"), 0666); err != nil {
 			log.Panic(err)
 		}
 		prettyPrintf("echo 'module testplugin' > %s/go.mod\n", dstRoot)
 	}

 	os.Setenv("GOPATH", filepath.Join(GOPATH, "alt"))
 	if err := os.Chdir(altRoot); err != nil {
 		log.Panic(err)
 	} else {
 		prettyPrintf("cd %s\n", altRoot)
 	}
 	os.Setenv("PWD", altRoot)
 	goCmd(nil, "build", "-buildmode=plugin", "-o", filepath.Join(modRoot, "plugin-mismatch.so"), "./plugin-mismatch")

 	os.Setenv("GOPATH", GOPATH)
 	if err := os.Chdir(modRoot); err != nil {
 		log.Panic(err)
 	} else {
 		prettyPrintf("cd %s\n", modRoot)
 	}
 	os.Setenv("PWD", modRoot)

 	os.Setenv("LD_LIBRARY_PATH", modRoot)

 	goCmd(nil, "build", "-buildmode=plugin", "./plugin1")
 	goCmd(nil, "build", "-buildmode=plugin", "./plugin2")
 	so, err := os.ReadFile("plugin2.so")
 	if err != nil {
 		log.Panic(err)
 	}
 	if err := os.WriteFile("plugin2-dup.so", so, 0444); err != nil {
 		log.Panic(err)
 	}
 	prettyPrintf("cp plugin2.so plugin2-dup.so\n")

 	goCmd(nil, "build", "-buildmode=plugin", "-o=sub/plugin1.so", "./sub/plugin1")
 	goCmd(nil, "build", "-buildmode=plugin", "-o=unnamed1.so", "./unnamed1/main.go")
 	goCmd(nil, "build", "-buildmode=plugin", "-o=unnamed2.so", "./unnamed2/main.go")
 	goCmd(nil, "build", "-o", "host.exe", "./host")

 	return m.Run()
 }

 func goCmd(t *testing.T, op string, args ...string) {
 	if t != nil {
 		t.Helper()
 	}
 	run(t, "go", append([]string{op, "-gcflags", gcflags}, args...)...)
 }

 // escape converts a string to something suitable for a shell command line.
 func escape(s string) string {
 	s = strings.Replace(s, "\\", "\\\\", -1)
 	s = strings.Replace(s, "'", "\\'", -1)
 	// Conservative guess at characters that will force quoting
 	if s == "" || strings.ContainsAny(s, "\\ ;#*&$~?!|[]()<>{}`") {
 		s = "'" + s + "'"
 	}
 	return s
 }

 // asCommandLine renders cmd as something that could be copy-and-pasted into a command line
 func asCommandLine(cwd string, cmd *exec.Cmd) string {
 	s := "("
 	if cmd.Dir != "" && cmd.Dir != cwd {
 		s += "cd" + escape(cmd.Dir) + ";"
 	}
 	for _, e := range cmd.Env {
 		if !strings.HasPrefix(e, "PATH=") &&
 			!strings.HasPrefix(e, "HOME=") &&
 			!strings.HasPrefix(e, "USER=") &&
 			!strings.HasPrefix(e, "SHELL=") {
 			s += " "
 			s += escape(e)
 		}
 	}
 	// These EVs are relevant to this test.
 	for _, e := range os.Environ() {
 		if strings.HasPrefix(e, "PWD=") ||
 			strings.HasPrefix(e, "GOPATH=") ||
 			strings.HasPrefix(e, "LD_LIBRARY_PATH=") {
 			s += " "
 			s += escape(e)
 		}
 	}
 	for _, a := range cmd.Args {
 		s += " "
 		s += escape(a)
 	}
 	s += " )"
 	return s
 }

 func run(t *testing.T, bin string, args ...string) string {
 	cmd := exec.Command(bin, args...)
 	cmdLine := asCommandLine(".", cmd)
 	prettyPrintf("%s\n", cmdLine)
 	cmd.Stderr = new(strings.Builder)
 	out, err := cmd.Output()
 	if err != nil {
 		if t == nil {
 			log.Panicf("%s: %v\n%s", strings.Join(cmd.Args, " "), err, cmd.Stderr)
 		} else {
 			t.Helper()
 			t.Fatalf("%s: %v\n%s", strings.Join(cmd.Args, " "), err, cmd.Stderr)
 		}
 	}

 	return string(bytes.TrimSpace(out))
 }

 func TestDWARFSections(t *testing.T) {
 	// test that DWARF sections are emitted for plugins and programs importing "plugin"
 	goCmd(t, "run", "./checkdwarf/main.go", "plugin2.so", "plugin2.UnexportedNameReuse")
 	goCmd(t, "run", "./checkdwarf/main.go", "./host.exe", "main.main")
 }

 func TestRunHost(t *testing.T) {
 	run(t, "./host.exe")
 }

 func TestUniqueTypesAndItabs(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "./iface_a")
 	goCmd(t, "build", "-buildmode=plugin", "./iface_b")
 	goCmd(t, "build", "-o", "iface.exe", "./iface")
 	run(t, "./iface.exe")
 }

 func TestIssue18676(t *testing.T) {
 	// make sure we don't add the same itab twice.
 	// The buggy code hangs forever, so use a timeout to check for that.
 	goCmd(t, "build", "-buildmode=plugin", "-o", "plugin.so", "./issue18676/plugin.go")
 	goCmd(t, "build", "-o", "issue18676.exe", "./issue18676/main.go")

 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()
 	cmd := exec.CommandContext(ctx, "./issue18676.exe")
 	out, err := cmd.CombinedOutput()
 	if err != nil {
 		t.Fatalf("%s: %v\n%s", strings.Join(cmd.Args, " "), err, out)
 	}
 }

 func TestIssue19534(t *testing.T) {
 	// Test that we can load a plugin built in a path with non-alpha characters.
 	goCmd(t, "build", "-buildmode=plugin", "-ldflags='-pluginpath=issue.19534'", "-o", "plugin.so", "./issue19534/plugin.go")
 	goCmd(t, "build", "-o", "issue19534.exe", "./issue19534/main.go")
 	run(t, "./issue19534.exe")
 }

 func TestIssue18584(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "-o", "plugin.so", "./issue18584/plugin.go")
 	goCmd(t, "build", "-o", "issue18584.exe", "./issue18584/main.go")
 	run(t, "./issue18584.exe")
 }

 func TestIssue19418(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "-ldflags=-X main.Val=linkstr", "-o", "plugin.so", "./issue19418/plugin.go")
 	goCmd(t, "build", "-o", "issue19418.exe", "./issue19418/main.go")
 	run(t, "./issue19418.exe")
 }

 func TestIssue19529(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "-o", "plugin.so", "./issue19529/plugin.go")
 }

 func TestIssue22175(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "-o", "issue22175_plugin1.so", "./issue22175/plugin1.go")
 	goCmd(t, "build", "-buildmode=plugin", "-o", "issue22175_plugin2.so", "./issue22175/plugin2.go")
 	goCmd(t, "build", "-o", "issue22175.exe", "./issue22175/main.go")
 	run(t, "./issue22175.exe")
 }

 func TestIssue22295(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "-o", "issue.22295.so", "./issue22295.pkg")
 	goCmd(t, "build", "-o", "issue22295.exe", "./issue22295.pkg/main.go")
 	run(t, "./issue22295.exe")
 }

 func TestIssue24351(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "-o", "issue24351.so", "./issue24351/plugin.go")
 	goCmd(t, "build", "-o", "issue24351.exe", "./issue24351/main.go")
 	run(t, "./issue24351.exe")
 }

 func TestIssue25756(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "-o", "life.so", "./issue25756/plugin")
 	goCmd(t, "build", "-o", "issue25756.exe", "./issue25756/main.go")
 	// Fails intermittently, but 20 runs should cause the failure
 	for n := 20; n > 0; n-- {
 		t.Run(fmt.Sprint(n), func(t *testing.T) {
 			t.Parallel()
 			run(t, "./issue25756.exe")
 		})
 	}
 }

 // Test with main using -buildmode=pie with plugin for issue #43228
 func TestIssue25756pie(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "-o", "life.so", "./issue25756/plugin")
 	goCmd(t, "build", "-buildmode=pie", "-o", "issue25756pie.exe", "./issue25756/main.go")
 	run(t, "./issue25756pie.exe")
 }

 func TestMethod(t *testing.T) {
 	// Exported symbol's method must be live.
 	goCmd(t, "build", "-buildmode=plugin", "-o", "plugin.so", "./method/plugin.go")
 	goCmd(t, "build", "-o", "method.exe", "./method/main.go")
 	run(t, "./method.exe")
 }

 func TestMethod2(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "-o", "method2.so", "./method2/plugin.go")
 	goCmd(t, "build", "-o", "method2.exe", "./method2/main.go")
 	run(t, "./method2.exe")
 }

 func TestMethod3(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "-o", "method3.so", "./method3/plugin.go")
 	goCmd(t, "build", "-o", "method3.exe", "./method3/main.go")
 	run(t, "./method3.exe")
 }

 func TestIssue44956(t *testing.T) {
 	goCmd(t, "build", "-buildmode=plugin", "-o", "issue44956p1.so", "./issue44956/plugin1.go")
 	goCmd(t, "build", "-buildmode=plugin", "-o", "issue44956p2.so", "./issue44956/plugin2.go")
 	goCmd(t, "build", "-o", "issue44956.exe", "./issue44956/main.go")
 	run(t, "./issue44956.exe")
 }

 func TestForkExec(t *testing.T) {
 	// Issue 38824: importing the plugin package causes it hang in forkExec on darwin.

 	t.Parallel()
 	goCmd(t, "build", "-o", "forkexec.exe", "./forkexec/main.go")

 	var cmd *exec.Cmd
 	done := make(chan int, 1)

 	go func() {
 		for i := 0; i < 100; i++ {
 			cmd = exec.Command("./forkexec.exe", "1")
 			err := cmd.Run()
 			if err != nil {
 				t.Errorf("running command failed: %v", err)
 				break
 			}
 		}
 		done <- 1
 	}()
 	select {
 	case <-done:
 	case <-time.After(5 * time.Minute):
 		cmd.Process.Kill()
 		t.Fatalf("subprocess hang")
 	}
 }
	// Copyright 2019 The Go Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.

	package plugin_test

	import (
	"bytes"
	"context"
	"flag"
	"fmt"
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
	"time"
	)

	var gcflags string = os.Getenv("GO_GCFLAGS")

	func TestMain(m *testing.M) {
	flag.Parse()
	if testing.Short() && os.Getenv("GO_BUILDER_NAME") == "" {
	fmt.Printf("SKIP - short mode and $GO_BUILDER_NAME not set\n")
	os.Exit(0)
	}
	log.SetFlags(log.Lshortfile)
	os.Exit(testMain(m))
	}

	// tmpDir is used to cleanup logged commands -- s/tmpDir/$TMPDIR/
	var tmpDir string

	// prettyPrintf prints lines with tmpDir sanitized.
	func prettyPrintf(format string, args ...interface{}) {
	s := fmt.Sprintf(format, args...)
	if tmpDir != "" {
	s = strings.ReplaceAll(s, tmpDir, "$TMPDIR")
	}
	fmt.Print(s)
	}

	func testMain(m *testing.M) int {
	// Copy testdata into GOPATH/src/testplugin, along with a go.mod file
	// declaring the same path.

	GOPATH, err := os.MkdirTemp("", "plugin_test")
	if err != nil {
	log.Panic(err)
	}
	defer os.RemoveAll(GOPATH)
	tmpDir = GOPATH

	modRoot := filepath.Join(GOPATH, "src", "testplugin")
	altRoot := filepath.Join(GOPATH, "alt", "src", "testplugin")
	for srcRoot, dstRoot := range map[string]string{
	"testdata": modRoot,
	filepath.Join("altpath", "testdata"): altRoot,
	} {
	if err := overlayDir(dstRoot, srcRoot); err != nil {
	log.Panic(err)
	}
	prettyPrintf("mkdir -p %s\n", dstRoot)
	prettyPrintf("rsync -a %s/ %s\n", srcRoot, dstRoot)

	if err := os.WriteFile(filepath.Join(dstRoot, "go.mod"), []byte("module testplugin\n"), 0666); err != nil {
	log.Panic(err)
	}
	prettyPrintf("echo 'module testplugin' > %s/go.mod\n", dstRoot)
	}

	os.Setenv("GOPATH", filepath.Join(GOPATH, "alt"))
	if err := os.Chdir(altRoot); err != nil {
	log.Panic(err)
	} else {
	prettyPrintf("cd %s\n", altRoot)
	}
	os.Setenv("PWD", altRoot)
	goCmd(nil, "build", "-buildmode=plugin", "-o", filepath.Join(modRoot, "plugin-mismatch.so"), "./plugin-mismatch")

	os.Setenv("GOPATH", GOPATH)
	if err := os.Chdir(modRoot); err != nil {
	log.Panic(err)
	} else {
	prettyPrintf("cd %s\n", modRoot)
	}
	os.Setenv("PWD", modRoot)

	os.Setenv("LD_LIBRARY_PATH", modRoot)

	goCmd(nil, "build", "-buildmode=plugin", "./plugin1")
	goCmd(nil, "build", "-buildmode=plugin", "./plugin2")
	so, err := os.ReadFile("plugin2.so")
	if err != nil {
	log.Panic(err)
	}
	if err := os.WriteFile("plugin2-dup.so", so, 0444); err != nil {
	log.Panic(err)
	}
	prettyPrintf("cp plugin2.so plugin2-dup.so\n")

	goCmd(nil, "build", "-buildmode=plugin", "-o=sub/plugin1.so", "./sub/plugin1")
	goCmd(nil, "build", "-buildmode=plugin", "-o=unnamed1.so", "./unnamed1/main.go")
	goCmd(nil, "build", "-buildmode=plugin", "-o=unnamed2.so", "./unnamed2/main.go")
	goCmd(nil, "build", "-o", "host.exe", "./host")

	return m.Run()
	}

	func goCmd(t *testing.T, op string, args ...string) {
	if t != nil {
	t.Helper()
	}
	run(t, "go", append([]string{op, "-gcflags", gcflags}, args...)...)
	}

	// escape converts a string to something suitable for a shell command line.
	func escape(s string) string {
	s = strings.Replace(s, "\\", "\\\\", -1)
	s = strings.Replace(s, "'", "\\'", -1)
	// Conservative guess at characters that will force quoting
	if s == "" \|\| strings.ContainsAny(s, "\\ ;#*&$~?!\|[]()<>{}`") {
	s = "'" + s + "'"
	}
	return s
	}

	// asCommandLine renders cmd as something that could be copy-and-pasted into a command line
	func asCommandLine(cwd string, cmd *exec.Cmd) string {
	s := "("
	if cmd.Dir != "" && cmd.Dir != cwd {
	s += "cd" + escape(cmd.Dir) + ";"
	}
	for _, e := range cmd.Env {
	if !strings.HasPrefix(e, "PATH=") &&
	!strings.HasPrefix(e, "HOME=") &&
	!strings.HasPrefix(e, "USER=") &&
	!strings.HasPrefix(e, "SHELL=") {
	s += " "
	s += escape(e)
	}
	}
	// These EVs are relevant to this test.
	for _, e := range os.Environ() {
	if strings.HasPrefix(e, "PWD=") \|\|
	strings.HasPrefix(e, "GOPATH=") \|\|
	strings.HasPrefix(e, "LD_LIBRARY_PATH=") {
	s += " "
	s += escape(e)
	}
	}
	for _, a := range cmd.Args {
	s += " "
	s += escape(a)
	}
	s += " )"
	return s
	}

	func run(t *testing.T, bin string, args ...string) string {
	cmd := exec.Command(bin, args...)
	cmdLine := asCommandLine(".", cmd)
	prettyPrintf("%s\n", cmdLine)
	cmd.Stderr = new(strings.Builder)
	out, err := cmd.Output()
	if err != nil {
	if t == nil {
	log.Panicf("%s: %v\n%s", strings.Join(cmd.Args, " "), err, cmd.Stderr)
	} else {
	t.Helper()
	t.Fatalf("%s: %v\n%s", strings.Join(cmd.Args, " "), err, cmd.Stderr)
	}
	}

	return string(bytes.TrimSpace(out))
	}

	func TestDWARFSections(t *testing.T) {
	// test that DWARF sections are emitted for plugins and programs importing "plugin"
	goCmd(t, "run", "./checkdwarf/main.go", "plugin2.so", "plugin2.UnexportedNameReuse")
	goCmd(t, "run", "./checkdwarf/main.go", "./host.exe", "main.main")
	}

	func TestRunHost(t *testing.T) {
	run(t, "./host.exe")
	}

	func TestUniqueTypesAndItabs(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "./iface_a")
	goCmd(t, "build", "-buildmode=plugin", "./iface_b")
	goCmd(t, "build", "-o", "iface.exe", "./iface")
	run(t, "./iface.exe")
	}

	func TestIssue18676(t *testing.T) {
	// make sure we don't add the same itab twice.
	// The buggy code hangs forever, so use a timeout to check for that.
	goCmd(t, "build", "-buildmode=plugin", "-o", "plugin.so", "./issue18676/plugin.go")
	goCmd(t, "build", "-o", "issue18676.exe", "./issue18676/main.go")

	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	cmd := exec.CommandContext(ctx, "./issue18676.exe")
	out, err := cmd.CombinedOutput()
	if err != nil {
	t.Fatalf("%s: %v\n%s", strings.Join(cmd.Args, " "), err, out)
	}
	}

	func TestIssue19534(t *testing.T) {
	// Test that we can load a plugin built in a path with non-alpha characters.
	goCmd(t, "build", "-buildmode=plugin", "-ldflags='-pluginpath=issue.19534'", "-o", "plugin.so", "./issue19534/plugin.go")
	goCmd(t, "build", "-o", "issue19534.exe", "./issue19534/main.go")
	run(t, "./issue19534.exe")
	}

	func TestIssue18584(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "-o", "plugin.so", "./issue18584/plugin.go")
	goCmd(t, "build", "-o", "issue18584.exe", "./issue18584/main.go")
	run(t, "./issue18584.exe")
	}

	func TestIssue19418(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "-ldflags=-X main.Val=linkstr", "-o", "plugin.so", "./issue19418/plugin.go")
	goCmd(t, "build", "-o", "issue19418.exe", "./issue19418/main.go")
	run(t, "./issue19418.exe")
	}

	func TestIssue19529(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "-o", "plugin.so", "./issue19529/plugin.go")
	}

	func TestIssue22175(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "-o", "issue22175_plugin1.so", "./issue22175/plugin1.go")
	goCmd(t, "build", "-buildmode=plugin", "-o", "issue22175_plugin2.so", "./issue22175/plugin2.go")
	goCmd(t, "build", "-o", "issue22175.exe", "./issue22175/main.go")
	run(t, "./issue22175.exe")
	}

	func TestIssue22295(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "-o", "issue.22295.so", "./issue22295.pkg")
	goCmd(t, "build", "-o", "issue22295.exe", "./issue22295.pkg/main.go")
	run(t, "./issue22295.exe")
	}

	func TestIssue24351(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "-o", "issue24351.so", "./issue24351/plugin.go")
	goCmd(t, "build", "-o", "issue24351.exe", "./issue24351/main.go")
	run(t, "./issue24351.exe")
	}

	func TestIssue25756(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "-o", "life.so", "./issue25756/plugin")
	goCmd(t, "build", "-o", "issue25756.exe", "./issue25756/main.go")
	// Fails intermittently, but 20 runs should cause the failure
	for n := 20; n > 0; n-- {
	t.Run(fmt.Sprint(n), func(t *testing.T) {
	t.Parallel()
	run(t, "./issue25756.exe")
	})
	}
	}

	// Test with main using -buildmode=pie with plugin for issue #43228
	func TestIssue25756pie(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "-o", "life.so", "./issue25756/plugin")
	goCmd(t, "build", "-buildmode=pie", "-o", "issue25756pie.exe", "./issue25756/main.go")
	run(t, "./issue25756pie.exe")
	}

	func TestMethod(t *testing.T) {
	// Exported symbol's method must be live.
	goCmd(t, "build", "-buildmode=plugin", "-o", "plugin.so", "./method/plugin.go")
	goCmd(t, "build", "-o", "method.exe", "./method/main.go")
	run(t, "./method.exe")
	}

	func TestMethod2(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "-o", "method2.so", "./method2/plugin.go")
	goCmd(t, "build", "-o", "method2.exe", "./method2/main.go")
	run(t, "./method2.exe")
	}

	func TestMethod3(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "-o", "method3.so", "./method3/plugin.go")
	goCmd(t, "build", "-o", "method3.exe", "./method3/main.go")
	run(t, "./method3.exe")
	}

	func TestIssue44956(t *testing.T) {
	goCmd(t, "build", "-buildmode=plugin", "-o", "issue44956p1.so", "./issue44956/plugin1.go")
	goCmd(t, "build", "-buildmode=plugin", "-o", "issue44956p2.so", "./issue44956/plugin2.go")
	goCmd(t, "build", "-o", "issue44956.exe", "./issue44956/main.go")
	run(t, "./issue44956.exe")
	}

	func TestForkExec(t *testing.T) {
	// Issue 38824: importing the plugin package causes it hang in forkExec on darwin.

	t.Parallel()
	goCmd(t, "build", "-o", "forkexec.exe", "./forkexec/main.go")

	var cmd *exec.Cmd
	done := make(chan int, 1)

	go func() {
	for i := 0; i < 100; i++ {
	cmd = exec.Command("./forkexec.exe", "1")
	err := cmd.Run()
	if err != nil {
	t.Errorf("running command failed: %v", err)
	break
	}
	}
	done <- 1
	}()
	select {
	case <-done:
	case <-time.After(5 * time.Minute):
	cmd.Process.Kill()
	t.Fatalf("subprocess hang")
	}
	}