如何测试这部分代码

发布于 2024-08-24 23:22:47 字数 204 浏览 1 评论 0原文

您好，我正在编写 junit 测试，如何测试此方法..这只是此方法的一部分：

public MyClass{

public void myMethod(){
List<myObject> list = readData();
}
}

我将如何对此进行测试？ ReadData 是 MyClass 中的私有方法吗？

原文

Hello I'm writting junit test how can I test this method .. this is only part of this method :

public MyClass{

public void myMethod(){
List<myObject> list = readData();
}
}

How will I make the test for this? ReadData is a private method inside MyClass?

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给不了的爱 2024-08-31 23:22:48

正如所写，测试 myMethod() 没有意义，除非 readData() 按照 Frank Grimm 提到的方式更改实例状态。要做的一件事是更改 myMethod() ，以便将 list 放入 List 实例变量中。然后您可能会这样做：

@Test
public void testThatReadDataReturnsACorrectList(){
   MyClass inst = new MyClass(); // Add args to ctor call if needed - maybe a file path that readData() will use?
   inst.myMethod();

   // Create a list of MyClasses that match what you expect readData() to return:
   List<MyClass> expectedList = new List<>();
   expectedList.Add(new MyClass(/* Some arguments */));
   expectedList.Add(new MyClass(/* Some more arguments */));
   expectedList.Add(new MyClass(/* Some other arguments */));

   // Assert that the list you created matches the list you get back from 
   assertArrayEquals("Did not get the list expected", expectedList.ToArray(), inst.getList().ToArray());

}

您仍然需要编写 MyClass.getList() 来返回 List 实例变量。

为了保持健壮性，您可以使 MyClass 构造函数接受一个实现 IMyReadInterface 等接口的对象。 readData() 将使用该对象。然后在测试中，您可以实例化一个也实现 IMyReadInterface 的模拟，配置该模拟以提供所需的数据，以便 readData() 正常工作，并构造 inst 与该模拟。

As written, it doesn't make sense to test myMethod() unless readData() changes the instance state the way Frank Grimm mentioned. One thing to do would be to change myMethod() so that it puts list into a List instance variable. Then you might do something like this:

@Test
public void testThatReadDataReturnsACorrectList(){
   MyClass inst = new MyClass(); // Add args to ctor call if needed - maybe a file path that readData() will use?
   inst.myMethod();

   // Create a list of MyClasses that match what you expect readData() to return:
   List<MyClass> expectedList = new List<>();
   expectedList.Add(new MyClass(/* Some arguments */));
   expectedList.Add(new MyClass(/* Some more arguments */));
   expectedList.Add(new MyClass(/* Some other arguments */));

   // Assert that the list you created matches the list you get back from 
   assertArrayEquals("Did not get the list expected", expectedList.ToArray(), inst.getList().ToArray());

}

You'd still have to write MyClass.getList() to return the List instance variable.

To be robust, you could make the MyClass constructor accept an object that implements an interface like IMyReadInterface. readData() would use that object. Then in your test, you could instantiate a mock that also implements IMyReadInterface, configure the mock to provide the data needed so that readData() works correctly, and construct inst with that mock.

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