From d2af884aedf68f4534e2afa20e4c282cc4e7eba2 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Wed, 5 Aug 2020 17:13:02 +0200
Subject: [PATCH] Added a failing test for #4272.

---
 .../Utils/SelectedItemsSyncTests.cs                | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/Avalonia.Controls.UnitTests/Utils/SelectedItemsSyncTests.cs b/tests/Avalonia.Controls.UnitTests/Utils/SelectedItemsSyncTests.cs
index 3ab5950974..4aa7e24aa7 100644
--- a/tests/Avalonia.Controls.UnitTests/Utils/SelectedItemsSyncTests.cs
+++ b/tests/Avalonia.Controls.UnitTests/Utils/SelectedItemsSyncTests.cs
@@ -208,6 +208,20 @@ namespace Avalonia.Controls.UnitTests.Utils
                 target.SetItems(new[] { "foo", "bar", "baz" }));
         }
 
+        [Fact]
+        public void Selected_Items_Can_Be_Set_Before_SelectionModel_Source()
+        {
+            var model = new SelectionModel();
+            var target = new SelectedItemsSync(model);
+            var items = new AvaloniaList<string> { "foo", "bar", "baz" };
+            var selectedItems = new AvaloniaList<string> { "bar" };
+
+            target.SetItems(selectedItems);
+            model.Source = items;
+
+            Assert.Equal(new IndexPath(1), model.SelectedIndex);
+        }
+
         private static SelectedItemsSync CreateTarget(
             IEnumerable<string> items = null)
         {