utafrali commented on code in PR #9147:
URL: https://github.com/apache/hop/pull/9147#discussion_r4411612475


##########
core/src/test/java/org/apache/hop/i18n/GlobalMessageUtilTest.java:
##########
@@ -55,6 +58,29 @@ void isMissingKey() {
     assertFalse(GlobalMessageUtil.isMissingKey(" !"));
   }
 
+  @Test
+  void bundlesAreOnlyLookedUpAsPropertiesFiles() {
+    assertEquals(
+        ResourceBundle.Control.FORMAT_PROPERTIES,
+        new 
GlobalMessageUtil.GlobalMessageControl(true).getFormats("any.base.name"));
+  }
+
+  @Test

Review Comment:
   This test covers the path where `delegatesToSystemClassLoader` returns 
`false` and the retry happens. It would be worth adding a companion test for 
the opposite case — a loader whose parent chain includes the system class 
loader — to confirm that the fallback is NOT triggered (e.g., by verifying a 
bundle is found without reaching the system class loader, or that passing 
`ClassLoader.getSystemClassLoader()` as the loader directly still works). Right 
now there is no explicit proof that the guard short-circuits correctly for the 
common app-class-loader case.



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