tarExtractor = container.getComponent("tarExtractor");
    }

    /**
     * Test that ZipExtractor handles null input stream with appropriate error message.
     */
    public void test_ZipExtractor_nullInputStream_throwsWithMessage() {
        try {
            zipExtractor.getText(null, null);
            fail("Expected CrawlerSystemException");
        } catch (final CrawlerSystemException e) {