Beego Endpoint Testing - Empty Request URI

This is what my controller looks like

func (o *MyController) Get() {
    uri := o.Ctx.Input.URI()
    beego.Trace(uri)
}

Now if i make a request to the corresponding endpoint for example "http://localhost:8081/path?key=value", i get the correct value for uri

But if i test it with following code

func TestGet(t *testing.T) {
    Convey("valid request case", t, func() {
        w := httptest.NewRecorder()
        uri := "/path?key=value"
        r, _ := http.NewRequest("GET", uri, nil)
        beego.BeeApp.Handlers.ServeHTTP(w, r)
        So(w.Code, ShouldEqual, 200)
    })
}

uri in controller is empty string

However, o.Ctx.Request.URL has correct value i.e. '/path'