t.Fatalf("got %d fields, expected %d", i, len(values))
	}
	if err := s.Err(); err != nil {
		t.Fatal(err)
	}
}

func TestEmptyTokens(t *testing.T) {
	testEmptyTokens(t, "1,2,3,", []string{"1", "2", "3", ""})
}

func TestWithNoEmptyTokens(t *testing.T) {
	testEmptyTokens(t, "1,2,3", []string{"1", "2", "3"})
}

func loopAtEOFSplit(data []byte, atEOF bool) (advance int, token []byte, err error) {