unix: add tests for *xattr functions

Based on the tests in github.com/pkg/xattr

Change-Id: I3af73ad538877da042602708248063c218260a2e
Reviewed-on: https://go-review.googlesource.com/114135
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

unix/syscall_darwin_test.go

@@ -0,0 +1,19 @@
+// Copyright 2018 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 unix_test
+
+// stringsFromByteSlice converts a sequence of attributes to a []string.
+// On Darwin, each entry is a NULL-terminated string.
+func stringsFromByteSlice(buf []byte) []string {
+	var result []string
+	off := 0
+	for i, b := range buf {
+		if b == 0 {
+			result = append(result, string(buf[off:i]))
+			off = i + 1
+		}
+	}
+	return result
+}