Implement desktop sync protocol handling

WirelessTextSyncer.Windows.Tests/SyncMessageTests.cs

@@ -0,0 +1,31 @@
+using System.Text.Json;
+using WirelessTextSyncer.Windows.Models;
+
+namespace WirelessTextSyncer.Windows.Tests;
+
+[TestClass]
+public sealed class SyncMessageTests
+{
+    [TestMethod]
+    public void DeserializeAndroidInsertTextMessage()
+    {
+        var message = JsonSerializer.Deserialize<SyncMessage>(
+            """{"action":"insertText","text":"hello"}""",
+            new JsonSerializerOptions(JsonSerializerDefaults.Web));
+
+        Assert.IsNotNull(message);
+        Assert.AreEqual(SyncAction.InsertText, message.Action);
+        Assert.AreEqual("hello", message.Text);
+    }
+
+    [TestMethod]
+    public void DeserializeAndroidBackspaceMessage()
+    {
+        var message = JsonSerializer.Deserialize<SyncMessage>(
+            """{"action":"backspace"}""",
+            new JsonSerializerOptions(JsonSerializerDefaults.Web));
+
+        Assert.IsNotNull(message);
+        Assert.AreEqual(SyncAction.Backspace, message.Action);
+    }
+}