Mockito验证在我的情况下调用一次函数 [英] Mockito verify a function is invoked once in my case

问题描述

我正在使用 Mockito 来编写我的测试用例。我有一个简单的类，其中包含一个函数 countPerson（boolean）我有兴趣测试它：

I am using Mockito to write my test case. I have a simple class which contains a function countPerson(boolean) which I am interested to test:

public class School {
  //School is a singleton class.

  public void countPerson(boolean includeTeacher) {
       if (includeTeacher) {
          countIncludeTeacher();
          return;
       }
       countOnlyStudents();
  }

  public void countIncludeTeacher() {...}
  public void countOnlyStudents() {...}
}

在我的单元测试中，我想测试 countPerson（boolean）函数：

In my unit test, I want to test the countPerson(boolean) function:

public class SchoolTest{
   private School mSchool;
   @Before
   public void setUp(){
      mSchool = School.getInstance();
   }
   @Test 
   public void testCountPerson() {
       mSchool.countPerson(true);
       //How to test/verify countIncludeTeacher() is invoked once?
   }
}

如何使用Mockito检查/验证 countIncludeTeacher（）在我的测试用例中被调用一次？

How to use Mockito to check/verify countIncludeTeacher() is invoked once in my test case?

推荐答案

你将不得不使用间谍。这里的问题是你要验证是否在真实的对象上调用了一个方法，而不是在模拟上。你不能在这里使用mock，因为它会存在类中的所有方法，因此默认情况下也会将 countPerson 除去。

You will have to use a spy. The problem here is that you want to verify that a method was called on a real object, not on a mock. You can't use a mock here, since it will stub all the methods in the class, thereby stubbing also countPerson to do nothing by default.

@Test 
public void testCountPerson() {
    School school = School.getInstance();
    School spySchool = Mockito.spy(school);
    spySchool.countPerson(true);
    verify(spySchool).countIncludeTeacher();
}

但是，请注意在使用间谍时应该非常小心，因为除非存在，真正的方法被称为。引用Mockito Javadoc：

However, note that you should be very careful when using spies because, unless stubbed, the real methods are gettings called. Quoting Mockito Javadoc:

真正的间谍应该小心使用<偶尔，例如在处理遗留代码时。

Real spies should be used carefully and occasionally, for example when dealing with legacy code.

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