need code in Java8 or java11

- Your task is to implement a suite of tests in JUnit 4 that will - When the argument passed to the method is nunl it returns an empty string - When the string has exactly one character the same string is returned - When the string is longer then 1 character its inverted version is returned. Examples of invert method usage Inverter. invert (" a "); 11 returns " a " Inverter. invert(nu11); 1/ returns "" Inverter. Invert("abcd"): /1 return "dcba" Requirements - Your task is to implement a suite of tests in JUnit 4 that will test all the possible behaviours of the invert method, as described above. - Your suite of tests will be run against multiple (wrong and correct) implementations of invert method. - All tests must pass for correct implementation. Otherwise you will receive 0%, so make sure that all tests pass for the correct one before submitting the task. - For a wrong implementation of the invert method, at least one of the test cases should fail. - For assertions, use static methods provided by the org.junit .Assert class, i.e. assertEquals, assertNotEquals, etc