public function testGetInstance()
 {
     $inst = LightStep::getInstance("test_group", "1234567890");
     $this->assertInstanceOf("\\LightStepBase\\Client\\ClientTracer", $inst);
     // Is it really a singleton?
     $inst2 = LightStep::getInstance("test_group", "1234567890");
     $this->assertSame($inst, $inst2);
 }
 public function tracer()
 {
     return LightStep::getInstance();
 }