this.formatter = createFormatter(format);
        return this;
    }

    /**
     * Creates a formatter for the given format name.
     *
     * @param format the format name
     * @return the formatter instance
     * @throws IllegalArgumentException if the format is null, empty, or not supported
     */
    protected IndexExportFormatter createFormatter(final String format) {

        final IndexExportFormatter formatter = indexExportJob.createFormatter("json");
        assertTrue(formatter instanceof JsonIndexExportFormatter);
    }

    @Test
    public void test_createFormatter_caseInsensitive() {
        assertTrue(indexExportJob.createFormatter("HTML") instanceof HtmlIndexExportFormatter);
        assertTrue(indexExportJob.createFormatter("Json") instanceof JsonIndexExportFormatter);