impls undoable events

lootalot_db/src/models/player/wealth.rs

@@ -22,7 +22,7 @@ fn unpack_gold_value(gold: f64) -> (i32, i32, i32, i32) {
 ///
 /// Values are held as individual pieces counts.
 /// Allows conversion from and to a floating amount of gold pieces.
-#[derive(Queryable, AsChangeset, Serialize, Deserialize, Debug)]
+#[derive(Queryable, AsChangeset, Serialize, Deserialize, PartialEq, Copy, Clone, Debug)]
 #[table_name = "players"]
 pub struct Wealth {
     pub cp: i32,
@@ -116,4 +116,52 @@ mod tests {
         }
     }
 
+    #[test]
+    fn test_negative_wealth() {
+        use super::Wealth;
+
+        assert_eq!(
+            Wealth{ cp: 3, sp: 2, gp: 1, pp: 0 } + Wealth{ cp: -8, pp: 0, sp: 0, gp: 0 },
+            Wealth::from_gp(1.23 - 0.08)
+        )
+
+    }
+    #[test]
+    fn test_negative_wealth_inverse() {
+        use super::Wealth;
+
+        assert_eq!(
+            (Wealth{ cp: 3, sp: 2, gp: 1, pp: 0 } + Wealth{ cp: -8, pp: 0, sp: 0, gp: 0 }).to_gp(),
+            1.23 - 0.08
+        )
+
+    }
+    #[test]
+    fn test_diff_adding() {
+        use super::Wealth;
+
+        /// Let say we add 0.08 gp
+        /// 1.23 + 0.08 gold is 1.31, diff is cp: -2, sp: +1
+        let old = Wealth::from_gp(1.23);
+        let new = Wealth::from_gp(1.31);
+        let diff = new - old;
+        assert_eq!(diff.as_tuple(), (-2, 1, 0, 0));
+        assert_eq!(diff.to_gp(), 0.08);
+        assert_eq!(new - diff, old);
+
+    }
+    #[test]
+    fn test_diff_subbing() {
+        use super::Wealth;
+
+        /// Let say we sub 0.08 gp
+        /// 1.31 - 0.08 gold is 1.23, diff is cp: +2, sp: -1
+        let old = Wealth::from_gp(1.31);
+        let new = Wealth::from_gp(1.23);
+        let diff = new - old;
+        assert_eq!(diff.as_tuple(), (2, -1, 0, 0));
+        assert_eq!(diff.to_gp(), -0.08);
+        assert_eq!(new - diff, old);
+    }
+
 }