java - jUnit，Mockito。如何确保抽象类中的方法(模板方法)调用抽象钩子(Hook)方法？

Question

我来了:

abstract class IdentifiedEntity<E extends IdentifiedEntity> implements Cloneable {
  ...
  public void updateWith(E that) {
    if (this != that) {
      if (that.isNew()) {
        throw new IllegalArgumentException("Cannot update with a new entity");
      }
      if (this.isNew()) {
        throw new IllegalStateException("Cannot update a new entity");
      }
      if (this.getId() != that.getId()) {
        throw new IllegalArgumentException("IDs do not match");
      }
      doUpdateWith(that);
    }
  }

  abstract void doUpdateWith(E that);
  ...
}

public final class User extends IdentifiedEntity<User> {
  ...
  @Override
  void doUpdateWith(User that) {
    assert that != null;
    this.name = that.name;
    this.email = that.email;
    System.arraycopy(that.password, 0, password, 0, password.length);
    this.enabled = that.enabled;
    this.caloriesPerDayLimit = that.caloriesPerDayLimit;
  }
  ...
}

问题是我如何对 updateWith(...) 进行单元测试，以确保它明确调用在后代中实现的抽象 doUpdateWith(...) (是的，当然，如果我通过了所有检查)？

就是你们!

Answer 1

创建一个虚拟子类

class ConcreteEntity extends IdentifiedEntity<ConcreteEntity> {
  @Override
  void doUpdateWith(ConcreteEntity that) {
  }
}

然后像这样测试:

@Test
public void test() throws Exception {
    ConcreteEntity e = Mockito.spy(new ConcreteEntity());
    e.updateWith(e);

    Mockito.verify(e).doUpdateWith(e);
}

不过这样的测试很特别。它不允许您更改方法的实现。