mockito ArrayList<String>问题

2022-01-14 00:00:00 mocking unit-testing arraylist mockito java

我有一个方法，我正在尝试进行单元测试.此方法将参数作为 ArrayList 并对其进行处理.我试图定义的模拟是:

I have a method that I am trying to unit test. This method takes a parameter as an ArrayList and does things with it. The mock I am trying to define is:

ArrayList<String> mocked = mock(ArrayList.class);

这会给出 [unchecked] unchecked conversion"警告.

which gives a [unchecked] unchecked conversion" warning. 

ArrayList<String> mocked = mock(ArrayList<String>.class);

给我一​​个错误.

有人愿意告诉我我做错了什么吗?

Anyone care to enlighten me as to what I am doing wrong?

推荐答案

替代方案是使用@Mock注解，因为Mockito可以使用类型反射来找到泛型类型:

The alternative is to use the @Mock annotation since then Mockito can use type reflection to find the generic type:

public class MyTest {

  @Mock
  private ArrayList<String> mockArrayList;

  ...

  public void setUp() {
    MockitoAnnotations.initMocks(this);
  }

  public void testMyTest() {
    when(mockArrayList.get(0)).thenReturn("Hello world");

    String result = mockArrayList.get(0);

    assertEquals("Should have the correct string", "Hello world", result);

    verify(mockArrayList).get(0);
  }
}

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