@Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    @SuppressWarnings("rawtypes")
    Chunk other = (Chunk) obj;
    if (lines == null) {
      if (other.lines != null)
        return false;
    } else if (!lines.equals(other.lines))
      return false;
    return position == other.position;
  }
@Test
  void should_not_be_equal_to_Object_of_different_type() {
    assertThat(chunk.equals("8")).isFalse();
  }