doc.put("title", titles[i]);
            doc.put("url", "http://example.com/" + i);
            msg.addSource(new ChatSource(i + 1, doc));
        }
        return msg;
    }

    // ========== escapeQueryValue tests ==========

    @Test
    public void test_escapeQueryValue_null() {
        assertEquals("", chatClient.testEscapeQueryValue(null));
    }

    @Test

    }

    /**
     * Escapes special characters in the value for use in Fess queries.
     *
     * @param value the value to escape
     * @return the escaped value
     */
    protected String escapeQueryValue(final String value) {
        if (value == null) {
            return "";
        }
        final StringBuilder sb = new StringBuilder(value.length() + 16);
        for (int i = 0; i < value.length(); i++) {