code review 5294074: src/pkg/[n-z]*: gofix -r error

src/pkg/strings/strings_test.go

 // Copyright 2009 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 strings_test
 
 import (
         "bytes"
-        "os"
+        "io"
         "reflect"
         "strconv"
         . "strings"
         "testing"
         "unicode"
         "unsafe"
         "utf8"
 )
 
 func eq(a, b []string) bool {
@@ skipping 732 matching lines @@
 func TestReadByte(t *testing.T) {
         testStrings := []string{"", abcd, faces, commas}
         for _, s := range testStrings {
                 reader := NewReader(s)
                 if e := reader.UnreadByte(); e == nil {
                         t.Errorf("Unreading %q at beginning: expected error", s)
                 }
                 var res bytes.Buffer
                 for {
                         b, e := reader.ReadByte()
-                        if e == os.EOF {
+                        if e == io.EOF {
                                 break
                         }
                         if e != nil {
                                 t.Errorf("Reading %q: %s", s, e)
                                 break
                         }
                         res.WriteByte(b)
                         // unread and read again
                         e = reader.UnreadByte()
                         if e != nil {
@@ skipping 19 matching lines @@
 func TestReadRune(t *testing.T) {
         testStrings := []string{"", abcd, faces, commas}
         for _, s := range testStrings {
                 reader := NewReader(s)
                 if e := reader.UnreadRune(); e == nil {
                         t.Errorf("Unreading %q at beginning: expected error", s)
                 }
                 res := ""
                 for {
                         r, z, e := reader.ReadRune()
-                        if e == os.EOF {
+                        if e == io.EOF {
                                 break
                         }
                         if e != nil {
                                 t.Errorf("Reading %q: %s", s, e)
                                 break
                         }
                         res += string(r)
                         // unread and read again
                         e = reader.UnreadRune()
                         if e != nil {
@@ skipping 114 matching lines @@
 func TestEqualFold(t *testing.T) {
         for _, tt := range EqualFoldTests {
                 if out := EqualFold(tt.s, tt.t); out != tt.out {
                         t.Errorf("EqualFold(%#q, %#q) = %v, want %v", tt.s, tt.t, out, tt.out)
                 }
                 if out := EqualFold(tt.t, tt.s); out != tt.out {
                         t.Errorf("EqualFold(%#q, %#q) = %v, want %v", tt.t, tt.s, out, tt.out)
                 }
         }
 }