Add test case

Java/src/test/java/com/gildedrose/GildedRoseTest.java

@@ -6,11 +6,153 @@ import org.junit.jupiter.api.Test;
 class GildedRoseTest {
 
   @Test
-  void foo() {
+  public void quality_never_is_negative() {
     Item[] items = new Item[] {new Item("foo", 0, 0)};
     GildedRose app = new GildedRose(items);
+
     app.updateQuality();
-    assertEquals("fixme", app.items[0].name);
+
+    assertEquals(0, app.items[0].quality);
+  }
+
+  @Test
+  public void sulfuras_could_not_be_sold() {
+    Item[] items = new Item[] {new Item("Sulfuras, Hand of Ragnaros", 10, 0)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(10, app.items[0].sellIn);
+  }
+
+  @Test
+  public void sulfuras_could_not_decrease_quality() {
+    Item[] items = new Item[] {new Item("Sulfuras, Hand of Ragnaros", 10, 10)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(10, app.items[0].quality);
+  }
+
+  @Test
+  public void quality_could_not_be_more_than_fifty() {
+    Item[] items = new Item[] {new Item("Aged Brie", 10, 50)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(50, app.items[0].quality);
+  }
+
+  @Test
+  public void item_with_date_passed_quality_decrease_by_twice() {
+    Item[] items = new Item[] {new Item("foo", -1, 40)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(38, app.items[0].quality);
+  }
+
+  @Test
+  public void aged_brie_increase_quality_when_it_gets_older() {
+    Item[] items = new Item[] {new Item("Aged Brie", 1, 40)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(41, app.items[0].quality);
+  }
+
+  @Test
+  public void aged_brie_increase_by_two_quality_when_date_passed() {
+    Item[] items = new Item[] {new Item("Aged Brie", -1, 40)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(42, app.items[0].quality);
+  }
+
+  @Test
+  public void aged_brie_increase_by_two_quality_when_date_passed_and_not_more_than_fifty() {
+    Item[] items = new Item[] {new Item("Aged Brie", -1, 50)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(50, app.items[0].quality);
+  }
+
+  @Test
+  public void backstage_passes_increase_quality_by_two_when_sellin_less_than_ten() {
+    Item[] items = new Item[] {new Item("Backstage passes to a TAFKAL80ETC concert", 10, 40)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(42, app.items[0].quality);
+  }
+
+  @Test
+  public void backstage_passes_increase_quality_by_two_when_sellin_less_than_six() {
+    Item[] items = new Item[] {new Item("Backstage passes to a TAFKAL80ETC concert", 6, 40)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(42, app.items[0].quality);
+  }
+
+  @Test
+  public void backstage_passes_increase_quality_by_three_when_sellin_less_than_five() {
+    Item[] items = new Item[] {new Item("Backstage passes to a TAFKAL80ETC concert", 5, 40)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(43, app.items[0].quality);
+  }
+
+  @Test
+  public void backstage_passes_increase_quality_by_two_when_sellin_less_than_six_and_not_more_than_fifty() {
+    Item[] items = new Item[] {new Item("Backstage passes to a TAFKAL80ETC concert", 6, 49)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(50, app.items[0].quality);
+  }
+
+  @Test
+  public void backstage_passes_increase_quality_by_three_when_sellin_less_than_five_and_not_more_than_fifty() {
+    Item[] items = new Item[] {new Item("Backstage passes to a TAFKAL80ETC concert", 5, 48)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(50, app.items[0].quality);
+  }
+
+  @Test
+  public void backstage_passes_quality_drops_to_zero_after_concert() {
+    Item[] items = new Item[] {new Item("Backstage passes to a TAFKAL80ETC concert", 0, 40)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(0, app.items[0].quality);
+  }
+
+  @Test
+  public void backstage_passes_quality_increase_quility_by_one_qhen_date_is_more_than_10() {
+    Item[] items = new Item[] {new Item("Backstage passes to a TAFKAL80ETC concert", 11, 40)};
+    GildedRose app = new GildedRose(items);
+
+    app.updateQuality();
+
+    assertEquals(41, app.items[0].quality);
   }
 
 }