test(sticky-index): introduce tests for Decode()

Tests/YDotNet.Tests.Unit/StickyIndexes/DecodeTests.cs

@@ -0,0 +1,62 @@
+using NUnit.Framework;
+using YDotNet.Document;
+using YDotNet.Document.Options;
+using YDotNet.Document.StickyIndexes;
+
+namespace YDotNet.Tests.Unit.StickyIndexes;
+
+public class DecodeTests
+{
+    [Test]
+    public void DecodesFromEmptyValue()
+    {
+        // Arrange
+        var doc = new Doc(
+            new DocOptions
+            {
+                Id = 91
+            });
+        var text = doc.Text("text");
+
+        var transaction = doc.WriteTransaction();
+        var stickyIndex = text.StickyIndex(transaction, index: 0, StickyAssociationType.Before);
+        transaction.Commit();
+
+        // Act
+        transaction = doc.WriteTransaction();
+        var decodedStickyIndex = StickyIndex.Decode(stickyIndex.Encode());
+        var index = decodedStickyIndex?.Read(transaction);
+        transaction.Commit();
+
+        // Assert
+        Assert.That(decodedStickyIndex, Is.Not.Null);
+        Assert.That(index, Is.EqualTo(expected: 0));
+    }
+
+    [Test]
+    public void DecodesOnFilledValue()
+    {
+        // Arrange
+        var doc = new Doc(
+            new DocOptions
+            {
+                Id = 73
+            });
+        var text = doc.Text("text");
+
+        var transaction = doc.WriteTransaction();
+        text.Insert(transaction, index: 0, "Lucas");
+        var stickyIndex = text.StickyIndex(transaction, index: 3, StickyAssociationType.Before);
+        transaction.Commit();
+
+        // Act
+        transaction = doc.WriteTransaction();
+        var decodedStickyIndex = StickyIndex.Decode(stickyIndex.Encode());
+        var index = decodedStickyIndex?.Read(transaction);
+        transaction.Commit();
+
+        // Assert
+        Assert.That(decodedStickyIndex, Is.Not.Null);
+        Assert.That(index, Is.EqualTo(expected: 3));
+    }
+}