@Test
    public void testEscaping () {
        String a = "This line contains a \\ backslash and \n newline and \t tab.";
        String b = "This line contains a \\\\ backslash and \\n newline and \\t tab.";
        assertEquals(b, VespaFormat.escape(a));
        assertEquals(a, VespaFormatter.unEscape(b));
    }
test backslash, newline and tab escaping.  one instance of each
vespalog/src/test/java/com/yahoo/log/VespaFormatterTestCase.java