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SvenO3 pushed a commit to branch 
4651-adding-nested-objects-in-the-adapter-script-transformation-causes-an-error
in repository https://gitbox.apache.org/repos/asf/streampipes.git

commit a8204ab0450140a52f444ba8ed357bed4fc6913e
Author: Sven Oehler <[email protected]>
AuthorDate: Tue Jul 21 13:27:59 2026 +0200

    Add test
---
 .../transformer/js/GraalJsScriptEngineTest.java      | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git 
a/streampipes-connect-transformer-js/src/test/java/org/apache/streampipes/connect/transformer/js/GraalJsScriptEngineTest.java
 
b/streampipes-connect-transformer-js/src/test/java/org/apache/streampipes/connect/transformer/js/GraalJsScriptEngineTest.java
index 721fdd4324..63616b4830 100644
--- 
a/streampipes-connect-transformer-js/src/test/java/org/apache/streampipes/connect/transformer/js/GraalJsScriptEngineTest.java
+++ 
b/streampipes-connect-transformer-js/src/test/java/org/apache/streampipes/connect/transformer/js/GraalJsScriptEngineTest.java
@@ -173,6 +173,26 @@ public class GraalJsScriptEngineTest {
     assertEquals(0, output.get(0).get("value"));
   }
 
+  @Test
+  void collectEventWithNestedJavaScriptObjectAddedToHostMap() throws Exception 
{
+    var transformer = engine.compile("""
+        function transform(event, out, ctx) {
+          event.test = {"test": 1};
+          out.collect(event);
+        }
+        """);
+
+    var output = new ArrayList<Map<String, Object>>();
+    transformer.transform(new LinkedHashMap<>(
+        Map.of(
+            "value", 1)), output::add, null);
+
+    assertEquals(1, output.size());
+    assertEquals(Map.of("test", 1), output.get(0).get("test"));
+    var serialized = OBJECT_MAPPER.writeValueAsString(output.get(0));
+    assertTrue(serialized.contains("\"test\":{\"test\":1}"));
+  }
+
   @Test
   void serializePrimitiveArraysNestedInHostMapOutput() throws Exception {
     var transformer = engine.compile("""

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