A civil trial set to start this month in New York City will test the legal boundaries of hundreds of claims remaining against General Motors Co. stemming from faulty ignition switches. The case involves an Oklahoma man who blames a defective ignition switch for preventing his air bags from deploying during a crash. It's the first trial to result from hundreds of lawsuits filed against GM after the auto giant revealed in 2014 that faulty ignition switches in Chevy Cobalts and other small cars necessitated an unprecedented recall. The switches can slip out of the "on" position, causing the cars...