Piper Sandler analyst Alexander Potter took a look at Tesla’s self-driving technology ahead of a planned robo-taxi launch in June. What he found might concern investors.

Tesla's China-made electric vehicle sales fell 6% in April from a year earlier, extending declines for a seventh month, as the U.S. automaker grapples with intense competition from its Chinese rivals and a tarnished image in Europe.

As April sales numbers are revealed, Tesla's situation is far from improving, with China and Europe continuing the downward trend despite the refreshed Model Y