",    "image-metadata-url": s.imageServer.URL,   }),  })  c.Assert(err, jc.ErrorIsNil)   result, err := env.StartInstance(s.callCtx, s.createStartInstanceArgs(c))  c.Assert(err, jc.ErrorIsNil)  c.Assert(result, gc.NotNil)   call := s.client.Calls()[0]  createVMArgs := call.Args[0].(vsphereclient.CreateVirtualMachineParams)  c.Assert(createVMArgs.