public static void verifyIncrementPubContent(String content) {
        if (content == null || content.length() == 0) {
            throw new IllegalArgumentException("The content for publishing or deleting cannot be null!");
        }
        for (int i = 0; i < content.length(); i++) {
            char c = content.charAt(i);
            if (c == '\r' || c == '\n') {
                throw new IllegalArgumentException("The content for publishing or deleting cannot contain enter and next line symbol!");
            }
            if (c == Constants.WORD_SEPARATOR.charAt(0)) {
                throw new IllegalArgumentException("The content for publishing or deleting cannot contain (char)2!");
            }
        }
    }
@Test
    void testVerifyIncrementPubContent() {
        
        String content = "";
        try {
            ContentUtils.verifyIncrementPubContent(content);
            fail();
        } catch (IllegalArgumentException e) {
            assertNotNull(e.toString());
        }
        
        content = "\r";
        try {
            ContentUtils.verifyIncrementPubContent(content);
            fail();
        } catch (IllegalArgumentException e) {
            assertNotNull(e.toString());
        }
        
        content = "\n";
        try {
            ContentUtils.verifyIncrementPubContent(content);
            fail();
        } catch (IllegalArgumentException e) {
            assertNotNull(e.toString());
        }
        
        content = Constants.WORD_SEPARATOR + "test";
        try {
            ContentUtils.verifyIncrementPubContent(content);
            fail();
        } catch (IllegalArgumentException e) {
            assertNotNull(e.toString());
        }
        
    }