public static String printableFieldNamesToString() {
        return printableFieldNamesToString(_saveConfig);
    }
@Test
    // header text should not change unexpectedly
    // if this test fails, check whether the default was intentionally changed or not
    public void testHeader() {
        final String HDR = "timeStamp,elapsed,label,responseCode,responseMessage,threadName,dataType,success,"
                + "failureMessage,bytes,sentBytes,grpThreads,allThreads,URL,Latency,IdleTime,Connect";
        assertEquals(HDR, CSVSaveService.printableFieldNamesToString(), "Header text has changed");
    }