A safety failure spotted in tests of a Chinese electric vehicle (EV) made by a Huawei Technologies-backed luxury brand has raised doubts about the cars many consumers view as a source of national pride, while prompting regulators to step up policing of quality and reliability. The Ministry of Industry and Information Technology (MIIT), along with three other ministry-level authorities, published draft rules on Saturday that would govern testing of new car models. The move came after a video...