Fixed tests to run again

src/roll.rs

@@ -123,7 +123,7 @@ fn displays() {
 #[test]
 fn rolls() {
     let x = Roll::new(20, 6);
-    for y in x.rolls() {
+    for y in x.clone().rolls() {
         assert!(y <= x.die());
     }
 }
@@ -131,8 +131,10 @@ fn rolls() {
 fn totaling() {
     for _ in 0..21 {
         let x = Roll::new(2, 6);
-        assert!(x.total() <= 12 && x.total() >= 2);
-        let y = Roll::new(3, 20);
-        assert!(y.total() <= 60 && y.total() >= 3);
+        let y = x.total();
+        assert!(y <= 12 && y >= 2);
+        let z = Roll::new(3, 20);
+        let y = z.total();
+        assert!(y <= 60_usize && y >= 3_usize);
     }
 }