diff --git a/rust/src/gildedrose.rs b/rust/src/gildedrose.rs
index 9e387756..6c31577a 100644
--- a/rust/src/gildedrose.rs
+++ b/rust/src/gildedrose.rs
@@ -36,7 +36,11 @@ impl GildedRose {
             {
                 if item.quality > 0 {
                     if item.name != "Sulfuras, Hand of Ragnaros" {
-                        item.quality = item.quality - 1;
+                        if item.name == "Conjured Mana Cake" {
+                            item.quality = item.quality - 2;
+                        } else {
+                            item.quality = item.quality - 1;
+                        }
                     }
                 }
             } else {
@@ -68,7 +72,11 @@ impl GildedRose {
                     if item.name != "Backstage passes to a TAFKAL80ETC concert" {
                         if item.quality > 0 {
                             if item.name != "Sulfuras, Hand of Ragnaros" {
-                                item.quality = item.quality - 1;
+                                if item.name == "Conjured Mana Cake" {
+                                    item.quality = item.quality - 2;
+                                } else {
+                                    item.quality = item.quality - 1;
+                                }
                             }
                         }
                     } else {
@@ -86,14 +94,107 @@ impl GildedRose {
 
 #[cfg(test)]
 mod tests {
+    pub struct TestCase {
+        pub iterations: i32,
+        pub expected_result: Vec<Item>,
+    }
+
     use super::{GildedRose, Item};
 
     #[test]
-    pub fn foo() {
-        let items = vec![Item::new("foo", 0, 0)];
+    pub fn test1() {
+        let items = vec![
+            Item::new("+5 Dexterity Vest", 10, 20),
+            Item::new("Aged Brie", 2, 0),
+            Item::new("Elixir of the Mongoose", 5, 7),
+            Item::new("Sulfuras, Hand of Ragnaros", 0, 80),
+            Item::new("Sulfuras, Hand of Ragnaros", -1, 80),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", 10, 49),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", 5, 49),
+            Item::new("Conjured Mana Cake", 15, 40),
+            Item::new("Conjured Mana Cake", 3, 46),
+        ];
+        let result_items_0 = vec![
+            Item::new("+5 Dexterity Vest", -2, 6),
+            Item::new("Aged Brie", -10, 22),
+            Item::new("Elixir of the Mongoose", -7, 0),
+            Item::new("Sulfuras, Hand of Ragnaros", 0, 80),
+            Item::new("Sulfuras, Hand of Ragnaros", -1, 80),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", 3, 41),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", -2, 0),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", -7, 0),
+            Item::new("Conjured Mana Cake", 3, 16),//expected behaviour sellin=15-12, quality=40-2*12=16
+            Item::new("Conjured Mana Cake", -9, 4),//expected behaviour sellin=3-12=-9, quality=46-(3*2 + 9*4)=4
+        ];
+        let test_case_0 = TestCase {
+            iterations: 12,
+            expected_result: result_items_0
+        };
         let mut rose = GildedRose::new(items);
-        rose.update_quality();
+        for i in 0..test_case_0.iterations {
+            println!("-------- day {} --------", i);
+            println!("name, sellIn, quality");
+            for item in &rose.items {
+                println!("{}", item);
+            }
+            println!();
+            rose.update_quality();//not shown in stdout
+        }
 
-        assert_eq!("fixme", rose.items[0].name);
+        for i in 0..rose.items.len() {
+            
+            println!("{}", rose.items[i].name);
+            assert_eq!((rose.items[i].sell_in, rose.items[i].quality), (test_case_0.expected_result[i].sell_in, test_case_0.expected_result[i].quality));
+        }
+    }
+
+    #[test]
+    pub fn test2() {
+        let items1 = vec![
+            Item::new("+5 Dexterity Vest", 10, 20),
+            Item::new("Aged Brie", 2, 0),
+            Item::new("Elixir of the Mongoose", 5, 7),
+            Item::new("Sulfuras, Hand of Ragnaros", 0, 80),
+            Item::new("Sulfuras, Hand of Ragnaros", -1, 80),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", 15, 20),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", 10, 49),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", 5, 49),
+            Item::new("Conjured Mana Cake", 15, 40),
+            Item::new("Conjured Mana Cake", 3, 46),
+        ];
+        let result_items_1 = vec![
+            Item::new("+5 Dexterity Vest", -19, 0),
+            Item::new("Aged Brie", -27, 50),
+            Item::new("Elixir of the Mongoose", -24, 0),
+            Item::new("Sulfuras, Hand of Ragnaros", 0, 80),
+            Item::new("Sulfuras, Hand of Ragnaros", -1, 80),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", -14, 0),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", -19, 0),
+            Item::new("Backstage passes to a TAFKAL80ETC concert", -24, 0),
+            Item::new("Conjured Mana Cake", -14, 0),//expected behaviour sellin=15-29=-14, quality=40-(15days*2 + 15days*4)=-50->0(should be zero)
+            Item::new("Conjured Mana Cake", -26, 0),//expected behaviour sellin=3-29=-26, quality=46-(3days*2 + 26days*4)=46-110=-64->0
+        ];
+        let test_case_1 = TestCase {
+            iterations: 29,
+            expected_result: result_items_1
+        };
+        let mut rose1 = GildedRose::new(items1);
+        for i in 0..test_case_1.iterations {
+            println!("-------- day {} --------", i);
+            println!("name, sellIn, quality");
+            for item in &rose1.items {
+                println!("{}", item);
+            }
+            println!();
+            rose1.update_quality();//not shown in stdout
+        }
+        for i in 0..rose1.items.len() {
+            
+            println!("{}", rose1.items[i].name);
+            assert_eq!((rose1.items[i].sell_in, rose1.items[i].quality), (test_case_1.expected_result[i].sell_in, test_case_1.expected_result[i].quality));
+        }
+
+        //assert_eq!("fixme", rose.items[0].name);
     }
 }