Added unit test for GildedRose class

ruby/gilded_rose_tests.rb

@@ -1,12 +1,42 @@
-require File.join(File.dirname(__FILE__), 'gilded_rose')
+require_relative 'gilded_rose'
+require_relative 'item'
 require 'test/unit'
 
 class TestUntitled < Test::Unit::TestCase
-
-  def test_foo
-    items = [Item.new("foo", 0, 0)]
+  def test_foo_quality_degrades_after_update
+    items = [Item.new("foo", 5, 10)]
     GildedRose.new(items).update_quality()
-    assert_equal items[0].name, "fixme"
+    assert_equal 4, items[0].sell_in
+    assert_equal 9, items[0].quality
   end
 
-end
+  def test_aged_brie_quality_increases_with_time
+    items = [Item.new("Aged Brie", 5, 10)]
+    GildedRose.new(items).update_quality()
+    assert_equal items[0].quality, 11
+  end
+
+  def test_sulfuras_quality_remains_constant
+    items = [Item.new("Sulfuras, Hand of Ragnaros", 5, 80)]
+    GildedRose.new(items).update_quality()
+    assert_equal items[0].quality, 80
+  end
+
+  def test_conjured_quality_degrades_twice_as_fast
+    items = [Item.new("Conjured", 5, 10)]
+    GildedRose.new(items).update_quality()
+    assert_equal items[0].quality, 6
+  end
+
+  def test_backstage_passes_quality_updates_based_on_sell_in_value
+    items = [Item.new("Backstage passes to a TAFKAL80ETC concert", 12, 10)]
+    GildedRose.new(items).update_quality()
+    assert_equal items[0].quality, 11
+  end
+
+  def test_backstage_passes_quality_drops_to_zero_after_concert
+    items = [Item.new("Backstage passes to a TAFKAL80ETC concert", 0, 10)]
+    GildedRose.new(items).update_quality()
+    assert_equal items[0].quality, 0
+  end
+end