如何验证是否在被测系统(不是模拟系统)上调用了方法 [英] How to verify if method is called on System under test (not a mock)

问题描述

我正在尝试编写一个单元测试，该单元测试需要确认是否调用了一个方法.我正在使用JUnit，Mockito和PowerMock.

I'm trying to write a unit test that needs to confirm if a method is called or not. I'm using JUnit, Mockito and PowerMock.

public class Invoice
{

  protected void createInvoice()
  {
    // random stuff here
    markInvoiceAsBilled("57");
  }

  protected void markInvoiceAsBilled(String code)
  {
    // marked as billed
  } 
}

因此，这里我的测试系统是Invoice.我正在运行此测试:

So, here my system under test is Invoice. I'm running this test:

  public class InvoiceTest
  {
    @Test
    public void testInvoiceMarkedAsBilled()
    {
      Invoice sut = new Invoice();
      Invoice sutSpy = spy(sut);

      sut.createInvoice();

      // I want to verify that markInvoiceAsBilled() was called
    }
  }

此示例只是实际代码的示例....

This example is just an example of what the actual code looks like....

我的问题是，mockito表示您只能验证是否在模拟对象上调用了一个方法...但是我不想模拟该对象，因为它是我的测试对象.我知道您可以监视正在测试的对象，所以这是我尝试的方法:

My problem is that mockito says you can only verify if a method is called on a mocked object... but I don't want to mock this object, as it's my object under test. I know that you can spy on the object you're testing, so here's what I tried:

  verify(sutSpy).markInvoiceAsBilled("57");

我想做的是不可能的吗?还是我只是以错误的方式去做?

Is what I'm trying to do not possible? Or am I just going about it the wrong way?

谢谢大家:)

推荐答案

我不确定您尝试做的事情是否是解决问题的最佳方法.

I'm not sure if what you are attempting to do is the best way to go about things.

我对验证Invoice.createInvoice()调用内部私有方法markInvoiceAsBilled()并不担心-而是测试调用createInvoice()以您期望的方式更改了Invoice对象的状态-即现在是BILLED或类似名称.

I wouldn't concern myself with verifying that Invoice.createInvoice() calls an internal, private method markInvoiceAsBilled() - instead test that calling createInvoice() changes the state of the Invoice object in the way you expect - i.e., that status is now BILLED or something similar.

换句话说-不要测试createInvoice()调用了什么方法-测试在调用此方法之后，对象的 state 是您所期望的.

In other words - don't test what methods are called by createInvoice() - test that after calling this method, the state of the object is what you expect.

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