sample.go

req, _ = http.NewRequest("POST", "", body)
req.Header.Add("Content-Type", writer.FormDataContentType())
w = httptest.NewRecorder()
router.ServeHTTP(w, req)
if w.Code != http.StatusOK {
        t.Errorf("uploadHandler POST returned %v, should be %v", w.Code, http.StatusOK)
}
err = deleteTestImage(sampleImgPath)
if err != nil {
        fmt.Println("unable to delete test image")
}