Add exception handling test (currently failing).

Runtime/ConfigureReinterop.cs

@@ -917,6 +917,8 @@ Cesium3DTilesetLoadFailureDetails tilesetDetails
 
             EditorUtility.SetDirty(null);
 #endif
+
+            TestReinterop.ThrowAnException();
         }
     }
 }

Runtime/TestReinterop.cs

@@ -0,0 +1,18 @@
+using Reinterop;
+
+namespace CesiumForUnity
+{
+    /// <summary>
+    /// Internal helpers for testing Reinterop functionality.
+    /// </summary>
+    [ReinteropNativeImplementation("CesiumForUnityNative::TestReinteropImpl", "TestReinteropImpl.h", true)]
+    internal partial class TestReinterop
+    {
+        public partial bool CallThrowAnExceptionFromCpp();
+
+        public static void ThrowAnException()
+        {
+            throw new System.Exception("Test Exception!");
+        }
+    }
+}

Tests/TestReinterop.cs

@@ -0,0 +1,11 @@
+using NUnit.Framework;
+
+public class TestReinterop
+{
+    [Test]
+    public void TestADotNetExceptionCanBeCaughtInCpp()
+    {
+        CesiumForUnity.TestReinterop o = new CesiumForUnity.TestReinterop();
+        Assert.IsTrue(o.CallThrowAnExceptionFromCpp());
+    }
+}

native~/Runtime/src/TestReinteropImpl.cpp

@@ -0,0 +1,18 @@
+#include "TestReinteropImpl.h"
+
+#include <DotNet/CesiumForUnity/TestReinterop.h>
+
+namespace CesiumForUnityNative {
+
+bool TestReinteropImpl::CallThrowAnExceptionFromCpp(
+    const DotNet::CesiumForUnity::TestReinterop& instance) {
+  try {
+    instance.ThrowAnException();
+  } catch (...) {
+    return true;
+  }
+
+  return false;
+}
+
+} // namespace CesiumForUnityNative

native~/Runtime/src/TestReinteropImpl.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <CesiumImpl.h>
+
+namespace DotNet::CesiumForUnity {
+class TestReinterop;
+}
+
+namespace CesiumForUnityNative {
+
+class TestReinteropImpl {
+public:
+  static bool CallThrowAnExceptionFromCpp(
+      const DotNet::CesiumForUnity::TestReinterop& instance);
+};
+
+} // namespace CesiumForUnityNative