The union representing Canada’s auto workers claimed a partial victory Tuesday after General Motors Canada announced its Oshawa, Ont., plant, which was slated to close later this year, will be converted to a part-stamping and autonomous vehicle testing facility. Unifor and GM Canada said the transition will cost $170 million and save 300 of the 2,600 union jobs at the plant, with the potential to grow and attract more jobs as the facility attracts new customers.