Fixes #3790. Can't build v2_develop RELEASE - "The local source 'C:\Users\Tig\s\gui-cs\Terminal.Gui\local_packages' doesn't exist." (#3794)

UnitTests/LocalPackagesTests.cs

@@ -0,0 +1,33 @@
+namespace Terminal.Gui;
+
+public class LocalPackagesTests
+{
+    private readonly string _localPackagesPath;
+
+    public LocalPackagesTests ()
+    {
+        // Define the local_packages path relative to the solution directory
+        _localPackagesPath = Path.Combine (Directory.GetCurrentDirectory (), "..", "..", "..", "..", "local_packages");
+    }
+
+    [Fact]
+    public void LocalPackagesFolderExists ()
+    {
+        Assert.True (Directory.Exists (_localPackagesPath),
+                     $"The local_packages folder does not exist: {_localPackagesPath}");
+    }
+
+    [Fact]
+    public void NupkgFilesExist ()
+    {
+        var nupkgFiles = Directory.GetFiles (_localPackagesPath, "*.nupkg");
+        Assert.NotEmpty (nupkgFiles);
+    }
+
+    [Fact]
+    public void SnupkgFilesExist ()
+    {
+        var snupkgFiles = Directory.GetFiles (_localPackagesPath, "*.snupkg");
+        Assert.NotEmpty (snupkgFiles);
+    }
+}