Add ItemRarity test (#6247)

patches/server/0643-Item-Rarity-API.patch

@@ -29,3 +29,33 @@ index 21c1d6b7e97a1dee372ea1fa8eb95a712db63418..e606c246f486eb0775a577ee7ccc87a8
      // Paper end
  
      /**
+diff --git a/src/test/java/io/papermc/paper/inventory/ItemRarityTest.java b/src/test/java/io/papermc/paper/inventory/ItemRarityTest.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..38e6d42098f216b1d24f50386e7be98181122d8d
+--- /dev/null
++++ b/src/test/java/io/papermc/paper/inventory/ItemRarityTest.java
+@@ -0,0 +1,24 @@
++package io.papermc.paper.inventory;
++
++import io.papermc.paper.adventure.PaperAdventure;
++import net.minecraft.world.item.Rarity;
++import org.junit.Test;
++
++import static org.junit.Assert.assertEquals;
++
++public class ItemRarityTest {
++
++    @Test
++    public void testConvertFromNmsToBukkit() {
++        for (Rarity nmsRarity : Rarity.values()) {
++            assertEquals("rarity names are mis-matched", ItemRarity.values()[nmsRarity.ordinal()].name(), nmsRarity.name());
++        }
++    }
++
++    @Test
++    public void testRarityFormatting() {
++        for (Rarity nmsRarity : Rarity.values()) {
++            assertEquals("rarity formatting is mis-matched", nmsRarity.color, PaperAdventure.asVanilla(ItemRarity.values()[nmsRarity.ordinal()].color));
++        }
++    }
++}