Added test for issue #716

tests/NSubstitute.Acceptance.Specs/ArgumentMatching.cs

@@ -1,7 +1,9 @@
 using NSubstitute.Acceptance.Specs.Infrastructure;
 using NSubstitute.Core;
 using NSubstitute.Core.Arguments;
+using NSubstitute.ExceptionExtensions;
 using NSubstitute.Exceptions;
+using NSubstitute.Extensions;
 using NUnit.Framework;
 
 namespace NSubstitute.Acceptance.Specs;
@@ -828,6 +830,25 @@ public void Does_not_support_matching_ArgAny_of_type_derived_from_base_type_with
         service.DidNotReceive().MyMethod(Arg.Any<MySampleClassArgument>());
     }
 
+    [Test]
+    public void Does_support_out_method_with_base_override()
+    {
+        var controlFactory = Substitute.For<MyHasMethodWithOutParameter>();
+
+        Assert.That(() => controlFactory.Configure()
+            .MethodWithOutParameter(default, out var _)
+            .ReturnsForAnyArgs(ci =>
+            {
+                ci[1] = 4;
+                return 3;
+            }), Throws.Nothing);
+
+        var returned = controlFactory.MethodWithOutParameter(0, out var outArg);
+        using var _ = Assert.EnterMultipleScope();
+        Assert.That(returned, Is.EqualTo(3));
+        Assert.That(outArg, Is.EqualTo(4));
+    }
+
     [SetUp]
     public void SetUp()
     {
@@ -845,4 +866,27 @@ public class MyOtherStringArgument : IMyArgument<string> { }
     public class MySampleClassArgument : IMyArgument<SampleClass> { }
     public class MyOtherSampleClassArgument : IMyArgument<SampleClass> { }
     public class MySampleDerivedClassArgument : MySampleClassArgument { }
+
+    public interface IHasMethodWithOutParameter
+    {
+        int MethodWithOutParameter(int arg1, out int arg2);
+    }
+    public class HasMethodWithOutParameter : IHasMethodWithOutParameter
+    {
+        public virtual int MethodWithOutParameter(int arg1, out int arg2)
+        {
+            arg2 = 2;
+            return 1;
+        }
+    }
+    public class MyHasMethodWithOutParameter : HasMethodWithOutParameter
+    {
+        // The presence of his override used to throw an exception in NSubstitute 5.0.0, caused by a bug in Caste.Core < 5.2.0
+        // https://github.com/nsubstitute/NSubstitute/issues/716
+        public override int MethodWithOutParameter(int arg1, out int arg2)
+        {
+            arg2 = 3;
+            return 2;
+        }
+    }
 }