From 061efb44ba96762145f519fd61282ad4124acce9 Mon Sep 17 00:00:00 2001
From: Travis Illig <tillig@paraesthesia.com>
Date: Sun, 15 Sep 2024 16:09:56 -0700
Subject: [PATCH] Add tests to validate fix for #1427.

---
 .../Features/PropertyInjectionTests.cs        | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/test/Autofac.Specification.Test/Features/PropertyInjectionTests.cs b/test/Autofac.Specification.Test/Features/PropertyInjectionTests.cs
index 0165a495f..b95b74bc8 100644
--- a/test/Autofac.Specification.Test/Features/PropertyInjectionTests.cs
+++ b/test/Autofac.Specification.Test/Features/PropertyInjectionTests.cs
@@ -398,6 +398,39 @@ public void DecoratedInstanceWithPropertyInjectionAllowingCircularReferencesStil
         instance.AssertProp();
     }
 
+    [Fact]
+    public void WithPropertyDelegateAllowsNullValue()
+    {
+        // Issue 1427: WithProperty should consistently allow null values.
+        var builder = new ContainerBuilder();
+        builder.RegisterType<HasPublicSetter>().WithProperty(t => t.Val, null);
+        var container = builder.Build();
+        var instance = container.Resolve<HasPublicSetter>();
+        Assert.Null(instance.Val);
+    }
+
+    [Fact]
+    public void WithPropertyNamedAllowsNullValue()
+    {
+        // Issue 1427: WithProperty should consistently allow null values.
+        var builder = new ContainerBuilder();
+        builder.RegisterType<HasPublicSetter>().WithProperty(nameof(HasPublicSetter.Val), null);
+        var container = builder.Build();
+        var instance = container.Resolve<HasPublicSetter>();
+        Assert.Null(instance.Val);
+    }
+
+    [Fact]
+    public void WithPropertyTypedAllowsNullValue()
+    {
+        // Issue 1427: WithProperty should consistently allow null values.
+        var builder = new ContainerBuilder();
+        builder.RegisterType<HasPublicSetter>().WithProperty(TypedParameter.From<string>(null));
+        var container = builder.Build();
+        var instance = container.Resolve<HasPublicSetter>();
+        Assert.Null(instance.Val);
+    }
+
     private class ConstructorParamNotAttachedToProperty
     {
         [SuppressMessage("SA1401", "SA1401")]