--- a/src/th06/ecl_vm.rs
+++ b/src/th06/ecl_vm.rs
@@ -981,7 +981,7 @@ mod tests {
         let anm0 = anms.pop().unwrap();
         let anm0 = Rc::new(RefCell::new(anm0));
         let prng = Rc::new(RefCell::new(Prng::new(0)));
-        let game = Game::new(prng, Rank::Easy);
+        let game = Game::new(prng, Rank::EASY);
         let game = Rc::new(RefCell::new(game));
         let enemy = Enemy::new(Position::new(0., 0.), 500, 0, 640, Rc::downgrade(&anm0), Rc::downgrade(&game));
         (game, enemy)
@@ -992,11 +992,11 @@ mod tests {
         let (game, enemy) = setup();
         let ecl = Ecl { mains: vec![], subs: vec![
             Sub { instructions: vec![
-                CallSub::new(0, Rank::Easy, SubInstruction::Call(1, 13, 12.)),
+                CallSub::new(0, Rank::EASY, SubInstruction::Call(1, 13, 12.)),
             ]},
             Sub { instructions: vec![
-                CallSub::new(0, Rank::Easy, SubInstruction::Noop()),
-                CallSub::new(1, Rank::Easy, SubInstruction::Return()),
+                CallSub::new(0, Rank::EASY, SubInstruction::Noop()),
+                CallSub::new(1, Rank::EASY, SubInstruction::Return()),
             ]},
         ]};
         let mut ecl_runner = EclRunner::new(&ecl, enemy, 0);