Wie kann man Gin-Handler-Funktionen effektiv mit Mocks testen?

import (
    "net/http/httptest"

    "github.com/gin-gonic/gin"
)

func mockGin() (*gin.Context, *httptest.ResponseRecorder) {
    w := httptest.NewRecorder()
    c, _ := gin.CreateTestContext(w)

    // Test request
    req := &http.Request{
        URL: &url.URL{},
        Header: make(http.Header),
    }

    // Test query
    testQuery := weldprogs.QueryParam{/* init fields */}

    q := req.URL.Query()
    for _, s := range testQuery.Basematgroup_id {
        q.Add("basematgroup_id", s)
    }

    // Set URL.RawQuery
    req.URL.RawQuery = q.Encode()

    // Set request to Gin context
    c.Request = req

    return c, w
}

type services interface {
    GetMaterialByFilter(*weldprogs.QueryParam) (*weldprogs.MaterialByFilter, error)
}

func mockWeldprogService(service services) {
    return func(c *gin.Context) {
        c.Set("svc_context_key", service)
    }
}

func TestGetMaterialByFilter(t *testing.T) {
    w := httptest.NewRecorder()
    c, _ := gin.CreateTestContext(w)

    c.Use(mockWeldprogService(&mockSvc{}))

    GetMaterialByFilter(c)

    // ...
}