fixes pc

emma/src/chip8/registers.rs

@@ -72,8 +72,10 @@ mod test {
     }
 
     #[test]
-    fn i_register_test() {
-
+    fn pc_test() {
+        let mut x = Chip8Registers::default();
+        x.set_pc(0x300);
+        assert_eq!(x.peek_pc(), 0x300);
     }
 
 }