trying video message reply, worked.

media_for_test/videourl.json

+{"video_url":"http://153.37.232.148/vweixinp.tc.qq.com/1007_baa70feeaffb450682d848707e2d38d9.f10.mp4?vkey=6027E95AC6BADE010F39C1C08FA1E8E264C4702D52BE4B04C6BAF89A0857AB371971463C6C1D5D4779E1B748D1BC21041EC5AFBCD41BE4E7D0295A3DA96254505E8ACBDF1C427FD2FC92D5AB0CA9BFD16C0E02D99675DED4&sha=0&save=1"}

server.go

 		} else {
 			reply, _ = BuildTextMsg(a.Event+"/"+a.EventKey, h.FromUserName)
 		}
+		mediaID := "cU8BYvAEp3H25V-yGO3WBtMVk2bZcEBgf_kje7V-EPkRA_U4x-OAWb_ONg6Y-Qxt"
+		reply = buildVideoMsg(h.FromUserName, mediaID, "标题", a.Event+"/"+a.EventKey)
 	}
 	w.Header().Set("Content-Type", "text/xml; charset=utf-8")
 	fmt.Fprint(w, reply)

upload_test.go

 	//{"type":"image","media_id":"3wx8MSvsBYDubAqNi_QZSzNyCrOQ4eoOPslXzpOm6Kzv2Sfh2RngUFlDLfxcSdG2","created_at":1494140549}
 	assert.NotEqual(t, mediaID, "", "MediaID should not be Empty")
 
+	//wait for a while for the video to be procssed
+	//time.Sleep(3000 * time.Millisecond)
+
 	//download the media back using the media id
-	filename, e := saveMedia2File(mediaID) // this isi a json with video link, we should download it and compare it.
+	filename, e := saveMedia2File(mediaID) // this is a json with video link, we should download it and compare it.
+
+	//
 	log.Println("saved :" + filename)
 	AssertEqual(t, e, nil, "mediaID should be saved without any error")
 	//make sure two files are the same
 	cmp := equalfile.New(nil, equalfile.Options{}) // compare using single mode
 	equal, err := cmp.CompareFile(src, filename)
-	AssertEqual(t, err, nil, "file should be equal ")
-	AssertEqual(t, equal, true, "file should be equal ")
+	AssertEqual(t, err, nil, "error ro compare file should be nil ")
+	AssertEqual(t, equal, true, "video file should be equal ")
 }

wechat_hitxy_access_token

-{"access_token":"p0-QwbIjK_jEqc-MvDTODjZgQDrrA0hUkcF2zk8y38_9P7xPodtiKx9dePoTs92bGrrthcUp-dj3izRXMt-Hfd0nFa1CW7nq0LzNLx7g1BCM2GyRxyt2q03G0CgOM3GpKIPiAHAXVC","expires_in":7200,"created_at":"2017-05-08T12:06:22.041624283+10:00"}
+{"access_token":"7_AZHknAOn1mHOS-kYHbN7jhMGBDHTbVHOLWvo_VcbePdruPvLJm2hhBbCU9BUSmmhBjhhNOvFMp1Hx12kunIGehLxKUGdKgJmO55mPVYXldjVivHcCfOS_XlDSMAxr3GMFgACASYR","expires_in":7200,"created_at":"2017-05-09T16:52:32.722017137+10:00"}