Add a test that shows JS objects can be modified if passed by reference into a C++ function

2 files changed, 18 insertions, 0 deletions

diff --git a/tests/embind/embind.test.js b/tests/embind/embind.test.js
index c7cad079..da81a81e 100644
--- a/tests/embind/embind.test.js
+++ b/tests/embind/embind.test.js
@@ -1878,6 +1878,16 @@ module({
         //     setTimeout(fn, 0);
         // });
     });
+
+    BaseFixture.extend("references", function() {
+        test("JS object handles can be passed through to C++ by reference", function() {
+            var sh = new cm.StringHolder("Hello world");
+            assert.equal("Hello world", sh.get());
+            cm.clear_StringHolder(sh);
+            assert.equal("", sh.get());
+            sh.delete();
+        });
+    });
 });
 
 /* global run_all_tests */
diff --git a/tests/embind/embind_test.cpp b/tests/embind/embind_test.cpp
index 419c216e..d6b27bce 100644
--- a/tests/embind/embind_test.cpp
+++ b/tests/embind/embind_test.cpp
@@ -2235,3 +2235,11 @@ EMSCRIPTEN_BINDINGS(with_adjustment) {
 
     function("return_Base_from_DerivedWithOffset", &return_Base_from_DerivedWithOffset);
 }
+
+void clear_StringHolder(StringHolder& sh) {
+    sh.set("");
+}
+
+EMSCRIPTEN_BINDINGS(references) {
+    function("clear_StringHolder", &clear_StringHolder);
+}