ResultData result3 = transformer3.transform(responseData);

        assertEquals("transformer1", result1.getTransformerName());
        assertEquals("transformer2", result2.getTransformerName());
        assertEquals("transformer3", result3.getTransformerName());

        assertEquals(1, transformer1.getTransformCallCount());
        assertEquals(1, transformer2.getTransformCallCount());

        responseData.setUrl("http://example.com");

        ResultData resultData = testTransformer.transform(responseData);

        assertNotNull(resultData);
        assertEquals("myTransformer", resultData.getTransformerName());
        assertEquals(1, testTransformer.getTransformCallCount());
        assertSame(responseData, testTransformer.getLastResponseData());
    }

    /**
     * Test transform with null name
     */

    public Object getData(final AccessResultData<?> accessResultData) {
        // check transformer name
        if (!getName().equals(accessResultData.getTransformerName())) {
            throw new CrawlerSystemException(
                    "Transformer is invalid. Use " + accessResultData.getTransformerName() + ". This transformer is " + getName() + ".");
        }

        final byte[] data = accessResultData.getData();
        if (data == null) {

                try {
                    final Transformer transformer = ComponentUtil.getComponent(accessResultData.getTransformerName());
                    if (transformer == null) {
                        // no transformer
                        logger.warn("No transformer: {}", accessResultData.getTransformerName());
                        continue;
                    }
                    @SuppressWarnings("unchecked")