From a37e24dc441f471f8f9d1896b09b5be569fc5028 Mon Sep 17 00:00:00 2001
From: Jeremy Koritzinsky <jkoritzinsky@gmail.com>
Date: Sat, 2 Jun 2018 12:30:12 -0500
Subject: [PATCH] Add unit test.

---
 .../AvaloniaObjectTests_Binding.cs            | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tests/Avalonia.Base.UnitTests/AvaloniaObjectTests_Binding.cs b/tests/Avalonia.Base.UnitTests/AvaloniaObjectTests_Binding.cs
index 02fb1f11ad..65d37503b6 100644
--- a/tests/Avalonia.Base.UnitTests/AvaloniaObjectTests_Binding.cs
+++ b/tests/Avalonia.Base.UnitTests/AvaloniaObjectTests_Binding.cs
@@ -457,6 +457,17 @@ namespace Avalonia.Base.UnitTests
             Assert.True(target.IsAnimating(Class1.FooProperty));
         }
 
+        [Fact]
+        public void TwoWay_Binding_Should_Not_Call_Setter_On_Creation()
+        {
+            var target = new Class1();
+            var source = new TestTwoWayBindingViewModel();
+
+            target.Bind(Class1.DoubleValueProperty, new Binding(nameof(source.Value), BindingMode.TwoWay) { Source = source });
+
+            Assert.False(source.SetterCalled);
+        }
+
         /// <summary>
         /// Returns an observable that returns a single value but does not complete.
         /// </summary>
@@ -545,5 +556,22 @@ namespace Avalonia.Base.UnitTests
                 }
             }
         }
+
+        private class TestTwoWayBindingViewModel
+        {
+            private double _value;
+
+            public double Value
+            {
+                get => _value;
+                set
+                {
+                    _value = value;
+                    SetterCalled = true;
+                }
+            }
+
+            public bool SetterCalled { get; private set; }
+        }
     }
 }
\ No newline at end of file