public void test_convertText() {
        BaseDateTimeField field = new MockBaseDateTimeField();
        assertEquals(0, field.convertText("0", null));
        assertEquals(29, field.convertText("29", null));
        try {
            field.convertText("2A", null);
            fail();
        } catch (IllegalArgumentException ex) {}
        try {
            field.convertText(null, null);
            fail();
        } catch (IllegalArgumentException ex) {}
    }