Make ObjectiveC tests in System.Runtime.InteropServices.Tests check exit code for remote execution (#63769)

Author: elinor-fung

src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/ObjectiveC/MessageSendTests.cs

@@ -71,6 +71,11 @@ public void SetMessageSendCallback_AlreadySet()
                 var (msgSend, func) = msgSendOverrides[0];
                 ObjectiveCMarshal.SetMessageSendCallback(msgSend, func);
                 Assert.Throws<InvalidOperationException>(() => ObjectiveCMarshal.SetMessageSendCallback(msgSend, func));
+
+                // TODO: Remove once https://github.com/dotnet/arcade/issues/5865 is resolved
+                // RemoteExecutor currently only checks the expected exit code if the invoked function returns an int.
+                // Check the exit code to ensure the test will fail if there was a crash that could not be caught by the executor.
+                return RemoteExecutor.SuccessExitCode;
             }).Dispose();
         }
 
@@ -97,6 +102,11 @@ public void SetMessageSendCallback(MessageSendFunction[] funcsToOverride)
                 }
 
                 SetMessageSendCallbackImpl(msgSendArray);
+
+                // TODO: Remove once https://github.com/dotnet/arcade/issues/5865 is resolved
+                // RemoteExecutor currently only checks the expected exit code if the invoked function returns an int.
+                // Check the exit code to ensure the test will fail if there was a crash that could not be caught by the executor.
+                return RemoteExecutor.SuccessExitCode;
             }, string.Join(';', funcsToOverride)).Dispose();
         }
 
@@ -150,4 +160,3 @@ private static void SetMessageSendCallbackImpl(MessageSendFunction[] funcsToOver
         }
     }
 }
-

src/libraries/System.Runtime.InteropServices/tests/System.Runtime.InteropServices.UnitTests/System/Runtime/InteropServices/ObjectiveC/PendingExceptionTests.cs

@@ -59,6 +59,11 @@ public void ValidateSetMessageSendPendingException(MessageSendFunction func)
                 Assert.True(Enum.IsDefined<MessageSendFunction>(msgSend));
 
                 ValidateSetMessageSendPendingExceptionImpl(msgSend);
+
+                // TODO: Remove once https://github.com/dotnet/arcade/issues/5865 is resolved
+                // RemoteExecutor currently only checks the expected exit code if the invoked function returns an int.
+                // Check the exit code to ensure the test will fail if there was a crash that could not be caught by the executor.
+                return RemoteExecutor.SuccessExitCode;
             }, func.ToString()).Dispose();
         }
 
@@ -95,4 +100,4 @@ private static void ValidateSetMessageSendPendingExceptionImpl(MessageSendFuncti
             Assert.Equal(msgSend.ToString(), ex.Message);
         }
     }
-}
+}