xattr: tests for non-linux

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

xattr/xattr_test.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package xattr
 
 import (

xattr/xattr_unsupported_test.go

@@ -0,0 +1,44 @@
+// +build !linux
+
+package xattr
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+func TestXattrUnsupported(t *testing.T) {
+	fh, err := ioutil.TempFile(".", "xattr.")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.Remove(fh.Name())
+	if err := fh.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	// because xattrs are "not supported" on this platform, they're like a black
+	// box.
+	write := []byte("1234")
+	expected := []byte("")
+
+	if err := Set(fh.Name(), "user.testing", write); err != nil {
+		t.Fatal(fh.Name(), err)
+	}
+	l, err := List(fh.Name())
+	if err != nil {
+		t.Error(fh.Name(), err)
+	}
+	if len(l) > 0 {
+		t.Errorf("%q: expected a list of at least 0; got %d", fh.Name(), len(l))
+	}
+	got, err := Get(fh.Name(), "user.testing")
+	if err != nil {
+		t.Fatal(fh.Name(), err)
+	}
+	if !bytes.Equal(got, expected) {
+		t.Errorf("%q: expected %q; got %q", fh.Name(), expected, got)
+	}
+}