@Test
    public void testValidTZs() throws GuacamoleException {
        for (String tzStr : TZ_TEST_VALID) {
            String tzId = WHERE_IN_WORLD.parseValue(tzStr).getID();
            assertFalse(TimeZoneGuacamoleProperty.GMT_REGEX.matcher(tzId).matches());
        }
    }
Tests to verify that each of the items in this list returns a valid,
non-GMT timezone.

@throws GuacamoleException 
    If a test value fails to parse correctly as a non-GMT timezone.
guacamole-ext/src/test/java/org/apache/guacamole/properties/TimeZoneGuacamolePropertyTest.java