JUnit - string check fails because of \n

I have a JUnit test case where text blocks are checked. There is the hard coded "correct" value:

String CORRECT_VAL = "First\\nSecond";

The json is generated like this:

String json =
            "{\n" +
            "    \"val\":\"" + CORRECT_VAL + "\",\n" +
            "}";

This String is converted to a JSONObject by org.json. But then the test failed:

expected:<First[\r\n]Second> but was:<First[
]Second>

So I see the "\n" in the console, too. :(

---

Comment Try 1":

expected:<First\[\]nSecond> but was:<First\[]nSecond>
Expected :First\\nSecond
Actual   :First\nSecond