diff --git a/GildedRoseTest.test_update_quality.approved.txt b/GildedRoseTest.test_update_quality.approved.txt
index e530d984..bc2eabc9 100644
--- a/GildedRoseTest.test_update_quality.approved.txt
+++ b/GildedRoseTest.test_update_quality.approved.txt
@@ -1,9 +1,21 @@
+args: ('foo', -1, -1) => 'foo, -2, -1'
+args: ('foo', -1, 0) => 'foo, -2, 0'
+args: ('foo', -1, 1) => 'foo, -2, 0'
+args: ('foo', -1, 49) => 'foo, -2, 47'
+args: ('foo', -1, 50) => 'foo, -2, 48'
+args: ('foo', -1, 51) => 'foo, -2, 49'
 args: ('foo', 0, -1) => 'foo, -1, -1'
 args: ('foo', 0, 0) => 'foo, -1, 0'
 args: ('foo', 0, 1) => 'foo, -1, 0'
 args: ('foo', 0, 49) => 'foo, -1, 47'
 args: ('foo', 0, 50) => 'foo, -1, 48'
 args: ('foo', 0, 51) => 'foo, -1, 49'
+args: ('foo', 1, -1) => 'foo, 0, -1'
+args: ('foo', 1, 0) => 'foo, 0, 0'
+args: ('foo', 1, 1) => 'foo, 0, 0'
+args: ('foo', 1, 49) => 'foo, 0, 48'
+args: ('foo', 1, 50) => 'foo, 0, 49'
+args: ('foo', 1, 51) => 'foo, 0, 50'
 args: ('foo', 10, -1) => 'foo, 9, -1'
 args: ('foo', 10, 0) => 'foo, 9, 0'
 args: ('foo', 10, 1) => 'foo, 9, 0'
@@ -22,12 +34,24 @@ args: ('foo', 12, 1) => 'foo, 11, 0'
 args: ('foo', 12, 49) => 'foo, 11, 48'
 args: ('foo', 12, 50) => 'foo, 11, 49'
 args: ('foo', 12, 51) => 'foo, 11, 50'
+args: ('Aged Brie', -1, -1) => 'Aged Brie, -2, 1'
+args: ('Aged Brie', -1, 0) => 'Aged Brie, -2, 2'
+args: ('Aged Brie', -1, 1) => 'Aged Brie, -2, 3'
+args: ('Aged Brie', -1, 49) => 'Aged Brie, -2, 50'
+args: ('Aged Brie', -1, 50) => 'Aged Brie, -2, 50'
+args: ('Aged Brie', -1, 51) => 'Aged Brie, -2, 51'
 args: ('Aged Brie', 0, -1) => 'Aged Brie, -1, 1'
 args: ('Aged Brie', 0, 0) => 'Aged Brie, -1, 2'
 args: ('Aged Brie', 0, 1) => 'Aged Brie, -1, 3'
 args: ('Aged Brie', 0, 49) => 'Aged Brie, -1, 50'
 args: ('Aged Brie', 0, 50) => 'Aged Brie, -1, 50'
 args: ('Aged Brie', 0, 51) => 'Aged Brie, -1, 51'
+args: ('Aged Brie', 1, -1) => 'Aged Brie, 0, 0'
+args: ('Aged Brie', 1, 0) => 'Aged Brie, 0, 1'
+args: ('Aged Brie', 1, 1) => 'Aged Brie, 0, 2'
+args: ('Aged Brie', 1, 49) => 'Aged Brie, 0, 50'
+args: ('Aged Brie', 1, 50) => 'Aged Brie, 0, 50'
+args: ('Aged Brie', 1, 51) => 'Aged Brie, 0, 51'
 args: ('Aged Brie', 10, -1) => 'Aged Brie, 9, 0'
 args: ('Aged Brie', 10, 0) => 'Aged Brie, 9, 1'
 args: ('Aged Brie', 10, 1) => 'Aged Brie, 9, 2'
@@ -46,12 +70,24 @@ args: ('Aged Brie', 12, 1) => 'Aged Brie, 11, 2'
 args: ('Aged Brie', 12, 49) => 'Aged Brie, 11, 50'
 args: ('Aged Brie', 12, 50) => 'Aged Brie, 11, 50'
 args: ('Aged Brie', 12, 51) => 'Aged Brie, 11, 51'
+args: ('Backstage passes to a TAFKAL80ETC concert', -1, -1) => 'Backstage passes to a TAFKAL80ETC concert, -2, 0'
+args: ('Backstage passes to a TAFKAL80ETC concert', -1, 0) => 'Backstage passes to a TAFKAL80ETC concert, -2, 0'
+args: ('Backstage passes to a TAFKAL80ETC concert', -1, 1) => 'Backstage passes to a TAFKAL80ETC concert, -2, 0'
+args: ('Backstage passes to a TAFKAL80ETC concert', -1, 49) => 'Backstage passes to a TAFKAL80ETC concert, -2, 0'
+args: ('Backstage passes to a TAFKAL80ETC concert', -1, 50) => 'Backstage passes to a TAFKAL80ETC concert, -2, 0'
+args: ('Backstage passes to a TAFKAL80ETC concert', -1, 51) => 'Backstage passes to a TAFKAL80ETC concert, -2, 0'
 args: ('Backstage passes to a TAFKAL80ETC concert', 0, -1) => 'Backstage passes to a TAFKAL80ETC concert, -1, 0'
 args: ('Backstage passes to a TAFKAL80ETC concert', 0, 0) => 'Backstage passes to a TAFKAL80ETC concert, -1, 0'
 args: ('Backstage passes to a TAFKAL80ETC concert', 0, 1) => 'Backstage passes to a TAFKAL80ETC concert, -1, 0'
 args: ('Backstage passes to a TAFKAL80ETC concert', 0, 49) => 'Backstage passes to a TAFKAL80ETC concert, -1, 0'
 args: ('Backstage passes to a TAFKAL80ETC concert', 0, 50) => 'Backstage passes to a TAFKAL80ETC concert, -1, 0'
 args: ('Backstage passes to a TAFKAL80ETC concert', 0, 51) => 'Backstage passes to a TAFKAL80ETC concert, -1, 0'
+args: ('Backstage passes to a TAFKAL80ETC concert', 1, -1) => 'Backstage passes to a TAFKAL80ETC concert, 0, 2'
+args: ('Backstage passes to a TAFKAL80ETC concert', 1, 0) => 'Backstage passes to a TAFKAL80ETC concert, 0, 3'
+args: ('Backstage passes to a TAFKAL80ETC concert', 1, 1) => 'Backstage passes to a TAFKAL80ETC concert, 0, 4'
+args: ('Backstage passes to a TAFKAL80ETC concert', 1, 49) => 'Backstage passes to a TAFKAL80ETC concert, 0, 50'
+args: ('Backstage passes to a TAFKAL80ETC concert', 1, 50) => 'Backstage passes to a TAFKAL80ETC concert, 0, 50'
+args: ('Backstage passes to a TAFKAL80ETC concert', 1, 51) => 'Backstage passes to a TAFKAL80ETC concert, 0, 51'
 args: ('Backstage passes to a TAFKAL80ETC concert', 10, -1) => 'Backstage passes to a TAFKAL80ETC concert, 9, 1'
 args: ('Backstage passes to a TAFKAL80ETC concert', 10, 0) => 'Backstage passes to a TAFKAL80ETC concert, 9, 2'
 args: ('Backstage passes to a TAFKAL80ETC concert', 10, 1) => 'Backstage passes to a TAFKAL80ETC concert, 9, 3'
@@ -70,12 +106,24 @@ args: ('Backstage passes to a TAFKAL80ETC concert', 12, 1) => 'Backstage passes
 args: ('Backstage passes to a TAFKAL80ETC concert', 12, 49) => 'Backstage passes to a TAFKAL80ETC concert, 11, 50'
 args: ('Backstage passes to a TAFKAL80ETC concert', 12, 50) => 'Backstage passes to a TAFKAL80ETC concert, 11, 50'
 args: ('Backstage passes to a TAFKAL80ETC concert', 12, 51) => 'Backstage passes to a TAFKAL80ETC concert, 11, 51'
+args: ('Sulfuras, Hand of Ragnaros', -1, -1) => 'Sulfuras, Hand of Ragnaros, -1, -1'
+args: ('Sulfuras, Hand of Ragnaros', -1, 0) => 'Sulfuras, Hand of Ragnaros, -1, 0'
+args: ('Sulfuras, Hand of Ragnaros', -1, 1) => 'Sulfuras, Hand of Ragnaros, -1, 1'
+args: ('Sulfuras, Hand of Ragnaros', -1, 49) => 'Sulfuras, Hand of Ragnaros, -1, 49'
+args: ('Sulfuras, Hand of Ragnaros', -1, 50) => 'Sulfuras, Hand of Ragnaros, -1, 50'
+args: ('Sulfuras, Hand of Ragnaros', -1, 51) => 'Sulfuras, Hand of Ragnaros, -1, 51'
 args: ('Sulfuras, Hand of Ragnaros', 0, -1) => 'Sulfuras, Hand of Ragnaros, 0, -1'
 args: ('Sulfuras, Hand of Ragnaros', 0, 0) => 'Sulfuras, Hand of Ragnaros, 0, 0'
 args: ('Sulfuras, Hand of Ragnaros', 0, 1) => 'Sulfuras, Hand of Ragnaros, 0, 1'
 args: ('Sulfuras, Hand of Ragnaros', 0, 49) => 'Sulfuras, Hand of Ragnaros, 0, 49'
 args: ('Sulfuras, Hand of Ragnaros', 0, 50) => 'Sulfuras, Hand of Ragnaros, 0, 50'
 args: ('Sulfuras, Hand of Ragnaros', 0, 51) => 'Sulfuras, Hand of Ragnaros, 0, 51'
+args: ('Sulfuras, Hand of Ragnaros', 1, -1) => 'Sulfuras, Hand of Ragnaros, 1, -1'
+args: ('Sulfuras, Hand of Ragnaros', 1, 0) => 'Sulfuras, Hand of Ragnaros, 1, 0'
+args: ('Sulfuras, Hand of Ragnaros', 1, 1) => 'Sulfuras, Hand of Ragnaros, 1, 1'
+args: ('Sulfuras, Hand of Ragnaros', 1, 49) => 'Sulfuras, Hand of Ragnaros, 1, 49'
+args: ('Sulfuras, Hand of Ragnaros', 1, 50) => 'Sulfuras, Hand of Ragnaros, 1, 50'
+args: ('Sulfuras, Hand of Ragnaros', 1, 51) => 'Sulfuras, Hand of Ragnaros, 1, 51'
 args: ('Sulfuras, Hand of Ragnaros', 10, -1) => 'Sulfuras, Hand of Ragnaros, 10, -1'
 args: ('Sulfuras, Hand of Ragnaros', 10, 0) => 'Sulfuras, Hand of Ragnaros, 10, 0'
 args: ('Sulfuras, Hand of Ragnaros', 10, 1) => 'Sulfuras, Hand of Ragnaros, 10, 1'
diff --git a/test_gilded_rose.py b/test_gilded_rose.py
index 1570876a..eadc0d98 100644
--- a/test_gilded_rose.py
+++ b/test_gilded_rose.py
@@ -19,7 +19,7 @@ class GildedRoseTest(unittest.TestCase):
             "Sulfuras, Hand of Ragnaros",
         ]
         input_qualities = [-1, 0, 1, 49, 50, 51]
-        input_sell_ins = [0, 10, 11, 12]
+        input_sell_ins = [-1, 0, 1, 10, 11, 12]
 
         verify_all_combinations(
             self.do_stuff,