Adds Item interface

PkmnLibRSharpTests/StaticData/ItemTests.cs

@@ -0,0 +1,31 @@
+using System;
+using NUnit.Framework;
+using PkmnLibSharp.StaticData;
+
+namespace PkmnLibRSharpTests.StaticData
+{
+    public class ItemTests
+    {
+        [Test]
+        public void BasicTests()
+        {
+            using var item = new Item("foobar", ItemCategory.Mail, BattleItemCategory.StatusHealing, 500,
+                Array.Empty<string>());
+            Assert.AreEqual("foobar", item.Name);
+            Assert.AreEqual(ItemCategory.Mail, item.Category);
+            Assert.AreEqual(BattleItemCategory.StatusHealing, item.BattleCategory);
+            Assert.AreEqual(500, item.Price);
+        }
+        
+        [Test]
+        public void FlagTests()
+        {
+            using var item = new Item("foobar", ItemCategory.Mail, BattleItemCategory.StatusHealing, 500,
+                new []{"foo", "zet"});
+            Assert.That(item.HasFlag("foo"));
+            Assert.That(item.HasFlag("zet"));
+            Assert.That(!item.HasFlag("bar"));
+        }
+
+    }
+}