A “state-level” testing platform for automotive semiconductors has opened in Shenzhen in China’s latest effort to boost technological self-reliance, as a Sino-Dutch dispute over chipmaker Nexperia puts the global car sector’s supply chains at risk. The platform, which commenced operations on Tuesday, was jointly established by two state-owned enterprises (SOEs): China Reform Holdings, an investment vehicle focused on industries related to national security and the economy, and research institute...