使用ApplyMethod替换gin.Context的方法未生效，为何？

```go
import (
"reflect"
"testing"

"github.com/agiledragon/gomonkey"
"github.com/gin-gonic/gin"
"github.com/golang/mock/gomock"
)

func TestSeq_GIN(t *testing.T) {
ctrl := gomock.NewController(t)
defer ctrl.Finish()

ginCtx := &gin.Context{
Params: gin.Params{
gin.Param{
Key: "ns",
Value: "aaaa",
},
},
}

patches := gomonkey.ApplyMethod(reflect.TypeOf(ginCtx), "Param", func(_ *gin.Context, _ string) string {
return "bbbb"
})

defer patches.Reset()

println("===1", ginCtx.Param("ns"))
t.Log("===2", ginCtx.Param("ns"))
}
```

go test -v 输出结果