Java 如何在 Mockito 中创建自定义数据类型列表的模拟？
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How to create a mock of list of a custom data type in Mockito?
提问by Sourabh
I have a class User with the following definition :
我有一个 User 类，其定义如下：
class User {
Integer id;
String name;
String addr;
//getters and setters
}
Now while testing a function, I am required to return a list of mocked Users for a stub, something like:
现在，在测试一个函数时，我需要返回一个存根的模拟用户列表，例如：
Mockito.when(userService.getListOfUsers()).thenReturn(mockList);
Now this mockList could be created as the following :
现在这个 mockList 可以创建如下：
List mockList = Mockito.mock(ArrayList.class);
But this mockList could be a list of anything. I won't be able to ensure its type. Is there a way to create list of :
但是这个 mockList 可以是任何东西的列表。我将无法确定它的类型。有没有办法创建以下列表：
List<User> mockListForUser = Mockito.mock(?);
采纳答案by Duncan Jones
You probably want to populate a normal list with your mocked objects. E.g.
您可能想用模拟对象填充普通列表。例如
List<User> mockList = new ArrayList<>();
User mockUser1 = Mockito.mock(User.class);
// ...
mockList.add(mockUser1);
// etc.
Note that by default, Mockito returns an empty collection for any mocked methods that returns a collection. So if you just want to return an empty list, Mockito will already do that for you.
请注意，默认情况下，Mockito 为任何返回集合的模拟方法返回一个空集合。所以如果你只想返回一个空列表，Mockito 已经为你做了。
回答by Jean Logeart
Use the @Mockannotation in your test since Mockito can use type reflection:
@Mock在测试中使用注释，因为 Mockito 可以使用类型反射：
@Mock
private ArrayList<User> mockArrayList;
