public SpringComponentContainer createChild() {
    return new SpringComponentContainer(this);
  }
@Test
  public void createChild_method_should_spawn_a_child_container(){
    SpringComponentContainer parent = new SpringComponentContainer();
    SpringComponentContainer child = parent.createChild();
    assertThat(child).isNotEqualTo(parent);
    assertThat(child.parent).isEqualTo(parent);
    assertThat(parent.children).contains(child);
  }