path/filepath: use testenv.MustHaveSymlink to simplify symlink tests

Cleanup test code for symbolic links.

Change-Id: I25f561cd34dc4d120a4143f933619d233a6cffc5
Reviewed-on: https://go-review.googlesource.com/27573Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/path/filepath/match_test.go

@@ -6,6 +6,7 @@ package filepath_test
 
 import (
 	"fmt"
+	"internal/testenv"
 	"io/ioutil"
 	"os"
 	. "path/filepath"
@@ -174,15 +175,7 @@ var globSymlinkTests = []struct {
 }
 
 func TestGlobSymlink(t *testing.T) {
-	switch runtime.GOOS {
-	case "android", "nacl", "plan9":
-		t.Skipf("skipping on %s", runtime.GOOS)
-	case "windows":
-		if !supportsSymlinks {
-			t.Skipf("skipping on %s", runtime.GOOS)
-		}
-
-	}
+	testenv.MustHaveSymlink(t)
 
 	tmpDir, err := ioutil.TempDir("", "globsymlink")
 	if err != nil {

src/path/filepath/path_test.go

@@ -6,6 +6,7 @@ package filepath_test
 
 import (
 	"errors"
+	"internal/testenv"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -15,8 +16,6 @@ import (
 	"testing"
 )
 
-var supportsSymlinks = true
-
 type PathTest struct {
 	path, result string
 }
@@ -776,13 +775,7 @@ func simpleJoin(dir, path string) string {
 }
 
 func TestEvalSymlinks(t *testing.T) {
-	switch runtime.GOOS {
-	case "android", "nacl", "plan9":
-		t.Skipf("skipping on %s", runtime.GOOS)
-	}
-	if !supportsSymlinks {
-		t.Skip("skipping because symlinks are not supported")
-	}
+	testenv.MustHaveSymlink(t)
 
 	tmpDir, err := ioutil.TempDir("", "evalsymlink")
 	if err != nil {
@@ -896,13 +889,7 @@ func TestEvalSymlinks(t *testing.T) {
 }
 
 func TestIssue13582(t *testing.T) {
-	switch runtime.GOOS {
-	case "android", "nacl", "plan9":
-		t.Skipf("skipping on %s", runtime.GOOS)
-	}
-	if !supportsSymlinks {
-		t.Skip("skipping because symlinks are not supported")
-	}
+	testenv.MustHaveSymlink(t)
 
 	tmpDir, err := ioutil.TempDir("", "issue13582")
 	if err != nil {

src/path/filepath/path_windows_test.go

@@ -13,29 +13,9 @@ import (
 	"path/filepath"
 	"reflect"
 	"strings"
-	"syscall"
 	"testing"
 )
 
-func init() {
-	tmpdir, err := ioutil.TempDir("", "symtest")
-	if err != nil {
-		panic("failed to create temp directory: " + err.Error())
-	}
-	defer os.RemoveAll(tmpdir)
-
-	err = os.Symlink("target", filepath.Join(tmpdir, "symlink"))
-	if err == nil {
-		return
-	}
-
-	err = err.(*os.LinkError).Err
-	switch err {
-	case syscall.EWINDOWS, syscall.ERROR_PRIVILEGE_NOT_HELD:
-		supportsSymlinks = false
-	}
-}
-
 func TestWinSplitListTestsAreValid(t *testing.T) {
 	comspec := os.Getenv("ComSpec")
 	if comspec == "" {