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// Copyright 2016 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 os_test
import (
func TestFixLongPath(t *testing.T) {
// 248 is long enough to trigger the longer-than-248 checks in
// fixLongPath, but short enough not to make a path component
// longer than 255, which is illegal on Windows. (which
// doesn't really matter anyway, since this is purely a string
// function we're testing, and it's not actually being used to
// do a system call)
veryLong := "l" + strings.Repeat("o", 248) + "ng"
for _, test := range []struct{ in, want string }{
// Short; unchanged:
{`C:\short.txt`, `C:\short.txt`},
{`C:\`, `C:\`},
{`C:`, `C:`},
// The "long" substring is replaced by a looooooong
// string which triggers the rewriting. Except in the
// cases below where it doesn't.
{`C:\long\foo.txt`, `\\?\C:\long\foo.txt`},
{`C:/long/foo.txt`, `\\?\C:\long\foo.txt`},
{`C:\long\foo\\bar\.\baz\\`, `\\?\C:\long\foo\bar\baz`},
{`\\unc\path`, `\\unc\path`},
{`long.txt`, `long.txt`},
{`C:long.txt`, `C:long.txt`},
{`c:\long\..\bar\baz`, `c:\long\..\bar\baz`},
{`\\?\c:\long\foo.txt`, `\\?\c:\long\foo.txt`},
{`\\?\c:\long/foo.txt`, `\\?\c:\long/foo.txt`},
} {
in := strings.Replace(, "long", veryLong, -1)
want := strings.Replace(test.want, "long", veryLong, -1)
if got := os.FixLongPath(in); got != want {
got = strings.Replace(got, veryLong, "long", -1)
t.Errorf("fixLongPath(%q) = %q; want %q",, got, test.want)