Need high Skilled Java developer to write test cases / question / solutions for IDE

Hi, We are looking for a highly experienced Java developer to write test question for Java interview for IDE with solution file and Test cases with Junit framework support. Need to setup on local and run the questions to satisfy the test cases. Sample Question: Write your test case in the Test file. Test Case 1: Should return “True” if solution file output is “Hello World” and False if anything else. Second, write code in the Solution file to satisfy your Test Case. Testing code : import [login to view URL]; import static [login to view URL]; public class TestJunit { String message = "Hello World"; MessageUtil messageUtil = new MessageUtil(message); @Test public void testPrintMessage() { assertEquals(message,[login to view URL]()); } } Solution code : public class MessageUtil { private String message; //Constructor //@param message to be printed public MessageUtil(String message){ [login to view URL] = message; } // Write your code here public String printMessage(){ String a = "Hello"; String b = "World"; String c = [login to view URL](" "+b); [login to view URL](c); return c; } } Above code can be put in solution and test file and can be tested here : Interview Tools [login to view URL] But our system will fail in various new questions as reported by other developers so to rectify that we need high level questions which is throwing error on our system but working fine locally. I am expecting 20-30 such questions /cases.