chore: initialize standalone UPM package

Tests/DataSerializerTests.cs

@@ -0,0 +1,81 @@
+using System;
+using NUnit.Framework;
+
+namespace ShrinkDataSaver.Tests
+{
+    [TestFixture]
+    public class DataSerializerTests
+    {
+        [Serializable]
+        private class SimpleData
+        {
+            public string Name = "test";
+            public int Score = 42;
+        }
+
+        [Serializable]
+        private class NestedData
+        {
+            public string Id = "root";
+            public SimpleData Child = new();
+            public int[] Numbers = { 1, 2, 3 };
+        }
+
+        [Test]
+        public void Serialize_Deserialize_SimpleObject()
+        {
+            var original = new SimpleData { Name = "Alice", Score = 100 };
+            var bytes = DataSerializer.Serialize(original);
+            var restored = DataSerializer.Deserialize<SimpleData>(bytes);
+
+            Assert.AreEqual("Alice", restored.Name);
+            Assert.AreEqual(100, restored.Score);
+        }
+
+        [Test]
+        public void Serialize_Deserialize_NestedObject()
+        {
+            var original = new NestedData
+            {
+                Id = "parent",
+                Child = new SimpleData { Name = "child", Score = 99 },
+                Numbers = new[] { 10, 20, 30 }
+            };
+
+            var bytes = DataSerializer.Serialize(original);
+            var restored = DataSerializer.Deserialize<NestedData>(bytes);
+
+            Assert.AreEqual("parent", restored.Id);
+            Assert.AreEqual("child", restored.Child.Name);
+            Assert.AreEqual(99, restored.Child.Score);
+            Assert.AreEqual(new[] { 10, 20, 30 }, restored.Numbers);
+        }
+
+        [Test]
+        public void ToJObject_FromJObject_RoundTrip()
+        {
+            var original = new SimpleData { Name = "Bob", Score = 77 };
+            var bytes = DataSerializer.Serialize(original);
+            var jObj = DataSerializer.ToJObject(bytes);
+
+            Assert.AreEqual("Bob", jObj["Name"].ToString());
+            Assert.AreEqual(77, (int)jObj["Score"]);
+
+            var bytesBack = DataSerializer.FromJObject(jObj);
+            var restored = DataSerializer.Deserialize<SimpleData>(bytesBack);
+            Assert.AreEqual("Bob", restored.Name);
+            Assert.AreEqual(77, restored.Score);
+        }
+
+        [Test]
+        public void Serialize_NullFields_Ignored()
+        {
+            var data = new SimpleData { Name = null, Score = 5 };
+            var bytes = DataSerializer.Serialize(data);
+            var json = System.Text.Encoding.UTF8.GetString(bytes);
+
+            Assert.IsFalse(json.Contains("Name"));
+            Assert.IsTrue(json.Contains("Score"));
+        }
+    }
+}