不能使用 mockDB(*MockDB 类型的变量)作为 struct 文字中的 *gorm.DB 值

我创建了一个Get函数，用于从postgres数据库获取练习.我写了模拟测试，但我从 struct 中得到了这个错误，我如何修复它呢？

我使用了处理程序 struct ，它有*Gorm.DB struct .

错误:

不能将moockDB(*MockDB类型的变量)用作 struct 文本中的*Gorm.DB值

// router
package exercises

import (
    "github.com/gin-gonic/gin"
    "gorm.io/gorm"
)

type Handlers struct {
    DB *gorm.DB
}

func RegisterRoutes(router *gin.Engine, db *gorm.DB) {
    h := &Handlers{
        DB: db,
    }

    routes := router.Group("/exercises")
    routes.POST("/", h.AddExercise)
    routes.GET("/", h.GetExercises)
    routes.GET("/:id", h.GetExercise)
    routes.PUT("/:id", h.UpdateExercise)
    routes.DELETE("/:id", h.DeleteExercise)
}

// test
package exercises

import (
    "net/http"
    "net/http/httptest"
    "testing"

    "github.com/gin-gonic/gin"
    "github.com/kayraberktuncer/sports-planner/pkg/common/models"
    "github.com/stretchr/testify/mock"
    "gorm.io/gorm"
)

type MockDB struct {
    mock.Mock
}

func (m *MockDB) Find(value interface{}) *gorm.DB {
    args := m.Called(value)
    return args.Get(0).(*gorm.DB)
}

func (m *MockDB) Error() error {
    args := m.Called()
    return args.Error(0)
}

func TestGetExercises(t *testing.T) {
    // Setup mock DB
    mockDB := new(MockDB)
    mockDB.On("Find", &[]models.Exercise{}).Return(mockDB).Once()

    // Setup Gin router
    router := gin.New()
    router.GET("/", func(c *gin.Context) {
        handlers := &Handlers{DB: mockDB} // error
        handlers.GetExercises(c)
    })

    // Perform request
    w := httptest.NewRecorder()
    req, _ := http.NewRequest("GET", "/", nil)
    router.ServeHTTP(w, req)

    // Assert response
    if w.Code != http.StatusOK {
        t.Errorf("Expected status code %d, got %d", http.StatusOK, w.Code)
    }

    // Assert mock DB was called correctly
    mockDB.AssertExpectations(t)
}

我想用我的处理程序 struct 进行模拟测试