public static BadRequestException clusterNotExists(String clusterName) {
    return new BadRequestException("cluster not exists for clusterName:%s", clusterName);
  }
@Test
  public void testClusterNotExists(){
    BadRequestException clusterNotExists = BadRequestException.clusterNotExists(clusterName);
    assertEquals("cluster not exists for clusterName:test", clusterNotExists.getMessage());
  }