src/test/java/com/example/g8backend/service/PostLikeServiceTest.java

package com.example.g8backend.service;

import com.example.g8backend.entity.Post;
import com.example.g8backend.entity.PostLike;
import com.example.g8backend.mapper.PostMapper;
import com.example.g8backend.service.impl.PostServiceImpl;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import static org.mockito.Mockito.*;

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

class PostLikeServiceTest {

    @InjectMocks
    private PostServiceImpl postService;

    @Mock
    private PostMapper postMapper;

    private Post post;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);  // 初始化mock对象
        post = new Post();
        post.setPostId(1L);
        post.setPostTitle("Test Post");
        post.setPostContent("This is a test post.");
        post.setUserId(1L);
    }

    // 测试点赞功能
    @Test
    void likePost_ShouldAddLike_WhenNotAlreadyLiked() {
        Long userId = 1L;
        Long postId = 1L;

        // 设置返回值，模拟查询用户是否已点赞
        when(postMapper.existsByUserIdAndPostId(userId, postId)).thenReturn(false);

        // 调用点赞方法
        postService.likePost(userId, postId);

        // 验证postMapper的insert方法被调用一次，表示插入点赞记录
        verify(postMapper, times(1)).insertLike(any(PostLike.class));
    }

    // 测试取消点赞功能
    @Test
    void unlikePost_ShouldRemoveLike_WhenAlreadyLiked() {
        Long userId = 1L;
        Long postId = 1L;

        // 设置返回值，模拟查询用户是否已点赞
        when(postMapper.existsByUserIdAndPostId(userId, postId)).thenReturn(true);

        // 调用取消点赞方法
        postService.unlikePost(userId, postId);

        // 验证postMapper的deleteLikeByUserIdAndPostId方法被调用一次，表示删除点赞记录
        verify(postMapper, times(1)).deleteLikeByUserIdAndPostId(userId, postId);
    }

    // 测试获取帖子点赞数功能
    @Test
    void getPostLikeCount_ShouldReturnCorrectCount() {
        Long postId = 1L;
        Long expectedCount = 10L;

        // 模拟查询返回点赞数
        when(postMapper.selectCount(postId)).thenReturn(expectedCount);

        // 调用获取点赞数方法
        Long actualCount = postService.getPostLikeCount(postId);

        // 验证返回的点赞数是否正确
        assertEquals(expectedCount, actualCount);
    }
}