@Test
public void testHashcode() {

  
  // Different pools, same block id -> different hashcode
  assertNotEquals(
      new ExtendedBlock(POOL_A, BLOCK_1_GS1).hashCode(),
      new ExtendedBlock(POOL_B, BLOCK_1_GS1).hashCode());
  
  // Same pool, different block id -> different hashcode
  assertNotEquals(
      new ExtendedBlock(POOL_A, BLOCK_1_GS1).hashCode(),
      new ExtendedBlock(POOL_A, BLOCK_2_GS1).hashCode());
  
  // Same block -> same hashcode
  assertEquals(
      new ExtendedBlock(POOL_A, BLOCK_1_GS1).hashCode(),
      new ExtendedBlock(POOL_A, BLOCK_1_GS1).hashCode());
}