Remove context.TODO from tests (#1778)

Author: StephenButtolph

snow/networking/handler/handler_test.go

@@ -621,7 +621,7 @@ func TestDynamicEngineTypeDispatch(t *testing.T) {
 			}
 
 			handler.Start(context.Background(), false)
-			handler.Push(context.TODO(), Message{
+			handler.Push(context.Background(), Message{
 				InboundMessage: message.InboundChits(
 					ids.Empty,
 					uint32(0),

vms/proposervm/vm_test.go

@@ -935,7 +935,7 @@ func TestExpiredBuildBlock(t *testing.T) {
 		nil,
 	))
 	defer func() {
-		require.NoError(proVM.Shutdown(context.TODO()))
+		require.NoError(proVM.Shutdown(context.Background()))
 	}()
 
 	// Initialize shouldn't be called again