From eb11c58bdfe38a31ab1ac5f9c91bdf7b241c0c2d Mon Sep 17 00:00:00 2001
From: Shesh Santosh <shesh.dishari@protonshub.in>
Date: Fri, 14 Feb 2025 16:05:15 +0530
Subject: [PATCH] add specs for current functionality

---
 ruby/gilded_rose_spec.rb | 87 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 81 insertions(+), 6 deletions(-)

diff --git a/ruby/gilded_rose_spec.rb b/ruby/gilded_rose_spec.rb
index 015a759f..8457f840 100644
--- a/ruby/gilded_rose_spec.rb
+++ b/ruby/gilded_rose_spec.rb
@@ -1,11 +1,86 @@
-require 'rspec'
-
 require File.join(File.dirname(__FILE__), 'gilded_rose')
 
 describe GildedRose do
-  it "does not change the name" do
-    items = [Item.new("foo", 0, 0)]
-    GildedRose.new(items).update_quality()
-    expect(items[0].name).to eq "fixme"
+  describe "#update_quality" do
+    def update_and_check_item(item_name:, initial_sell_in:, initial_quant:, output:)
+      items = [Item.new(item_name, initial_sell_in, initial_quant)]
+      GildedRose.new(items).update_quality()
+
+      expect(items[0].to_s).to eq output
+    end
+
+    it "does not change the name" do
+      items = [Item.new("foo", 0, 0)]
+      GildedRose.new(items).update_quality()
+      expect(items[0].name).to eq "foo"
+    end
+
+    it "raises error if incorrect sell_in value is passed" do
+      items = [Item.new("foo", "invalid", 0)]
+      expect { GildedRose.new(items).update_quality() }.to raise_error(StandardError)
+    end
+
+    it "raises error if incorrect quality value is passed" do
+      items = [Item.new("foo", 0, "invalid")]
+      expect { GildedRose.new(items).update_quality() }.to raise_error(StandardError)
+    end
+
+    context "Standard Items" do
+       it "decreases quality and sell_in by 1 while sell_in approaches 0" do
+        update_and_check_item(item_name: "+5 Dexterity Vest", initial_sell_in: 10, initial_quant: 20, output: "+5 Dexterity Vest, 9, 19")
+      end
+
+      it "decreases quality by 2 when sell_in value reaches 0" do
+        update_and_check_item(item_name: "+5 Dexterity Vest", initial_sell_in: 0, initial_quant: 10, output: "+5 Dexterity Vest, -1, 8")
+      end
+
+      it "checks for quality to never be less than 0" do
+        update_and_check_item(item_name: "+5 Dexterity Vest", initial_sell_in: 10, initial_quant: 0, output: "+5 Dexterity Vest, 9, 0")
+      end
+    end
+
+    context "Sulfuras, Hand of Ragnaros" do
+      it "never changes it's sell_in value and quantity" do
+        update_and_check_item(item_name: "Sulfuras, Hand of Ragnaros", initial_sell_in: 0, initial_quant: 80, output: "Sulfuras, Hand of Ragnaros, 0, 80")
+        update_and_check_item(item_name: "Sulfuras, Hand of Ragnaros", initial_sell_in: -1, initial_quant: 80, output: "Sulfuras, Hand of Ragnaros, -1, 80")
+      end
+    end
+
+    context "Aged Brie" do
+      it "increases quality and decreases sell_in by 1" do
+        update_and_check_item(item_name: "Aged Brie", initial_sell_in: 2, initial_quant: 0, output: "Aged Brie, 1, 1")
+      end
+
+      it "increases quality by 2 when sell in value reaches 0" do
+        update_and_check_item(item_name: "Aged Brie", initial_sell_in: 0, initial_quant: 2, output: "Aged Brie, -1, 4")
+      end
+
+      it "checks for quality to never be more than 50" do
+        update_and_check_item(item_name: "Aged Brie", initial_sell_in: 10, initial_quant: 50, output: "Aged Brie, 9, 50")
+      end
+    end
+
+
+    context "Backstage passes to a TAFKAL80ETC concert" do
+      it "quality increases by 1 when sell_in is neither be 10 or nor 5 " do
+        update_and_check_item(item_name: "Backstage passes to a TAFKAL80ETC concert", initial_sell_in: 12, initial_quant: 15, output: "Backstage passes to a TAFKAL80ETC concert, 11, 16")
+      end
+
+      it "quality increases by 2 when sell_in 10" do
+        update_and_check_item(item_name: "Backstage passes to a TAFKAL80ETC concert", initial_sell_in: 10, initial_quant: 15, output: "Backstage passes to a TAFKAL80ETC concert, 9, 17")
+      end
+
+      it "quality increases by 3 when sell_in 5" do
+        update_and_check_item(item_name: "Backstage passes to a TAFKAL80ETC concert", initial_sell_in: 5, initial_quant: 15, output: "Backstage passes to a TAFKAL80ETC concert, 4, 18")
+      end
+
+      it "quality drops to 0 after the sell_in 0" do
+        update_and_check_item(item_name: "Backstage passes to a TAFKAL80ETC concert", initial_sell_in: 0, initial_quant: 3, output: "Backstage passes to a TAFKAL80ETC concert, -1, 0")
+      end
+
+      it "quality should not be greater than 50" do
+        update_and_check_item(item_name: "Backstage passes to a TAFKAL80ETC concert", initial_sell_in: 10, initial_quant: 49, output: "Backstage passes to a TAFKAL80ETC concert, 9, 50")
+      end
+    end
   end
 end