java - MockitoAnnotations.initMocks 是否隐含？

Question

无论我是否使用，我的测试似乎都通过了

@BeforeEach
void initMocks() {
    MockitoAnnotations.initMocks(this);
}

或者不是，我不明白为什么，因为在“Pivotal Certified Professional Core Spring 5 Developer”一书中，我正在阅读一个测验的答案，说这是强制性的。

这是相关的完整代码片段

/*
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package com.apress.cems.mockito;

import com.apress.cems.dao.Storage;
import com.apress.cems.repos.StorageRepo;
import com.apress.cems.services.impl.SimpleStorageService;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;

import static org.junit.jupiter.api.Assertions.*;

import org.mockito.MockitoAnnotations;
import org.mockito.junit.jupiter.MockitoExtension;

import java.util.Optional;

import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.*;

/**
 * @author Iuliana Cosmina
 * @since 1.0
 * Description: new-style using Mockito mocks with JUnit 5
 */
@ExtendWith(MockitoExtension.class)
class SimpleStorageServiceTest3 {
    static final Long STORAGE_ID = 1L;

    @Mock //Creates mock instance of the field it annotates
    private StorageRepo mockRepo;

    @InjectMocks
    private SimpleStorageService storageService;

    @BeforeEach
    void initMocks() {
        MockitoAnnotations.initMocks(this);
    }

    @Test
    void findByIdPositive() {
        var storage = new Storage();
        storage.setId(STORAGE_ID);
        when(mockRepo.findById(any(Long.class))).thenReturn(Optional.of(storage));

        Storage result = storageService.findById(STORAGE_ID);

        verify(mockRepo, times(1)).findById(any(Long.class));
        assertAll(
                () -> assertNotNull(result),
                () -> assertEquals(storage.getId(), result.getId())
        );
    }
}

删除 initMocks 方法不会改变任何事情，该代码的其余部分是否以某种方式隐含了初始化？

Answer 1

仅当您不使用 @ExtendWith(MockitoExtension.class) 时才需要

MockitoAnnotations.initMocks(this);。每次调用测试方法时，扩展都会为您执行此操作。请参阅reference docs用于扩展。