func TestSet_WriteTo(t *testing.T) { var set suffix.Set set.Add("google.com") set.Add("youtube.com") set.Add("blog.golang.org") buf := &bytes.Buffer{} set.WriteTo(buf) s := buf.String() expected := `blog.golang.org google.com youtube.com ` if s != expected { t.Errorf("Expected %q, got %q", expected, s) } }