How to do junit testing for multiple functions together

I am writing Junit test cases for one java application. If I run the test functions individually its running fine. When I try to run them together its not running properly

Here is JUnit code

 public class CultureMachineTestCases{

     CultureMachineAssignment testObj=new CultureMachineAssignment ();
     HashSet<String> result =new HashSet<String>();
     String answer,answer1;
     int flagVal;
     @Before
     public void init() throws IOException{
         testObj.insertDataIntoSet();
         testObj.addKeywords("video1");
      }

     @Test
     public void testVideo() throws IOException {
        result=testObj.search("abcd");
        answer=result.toString();
        answer1=answer.replaceAll("[^a-z0-9]","");

          assertEquals("video1", answer1);

     }
     @Before
     public void initMethod() throws IOException{
         testObj.insertDataIntoSet();
         testObj.addKeywords("video2");
      }    
      @Test
      public void testLenth() throws IOException{
         flagVal=testObj.flag;

        assertEquals(1, flagVal);
     }
 }

Here flag is set to one in CultureMachineAssignment file. Can any one please tell me what I need to do so I can run all the functions inside test file together