diff --git a/cli/src/test/java/com/devonfw/tools/ide/context/ProcessContextGitMock.java b/cli/src/test/java/com/devonfw/tools/ide/context/ProcessContextGitMock.java
index 6eaf01822..47a44bd8f 100644
--- a/cli/src/test/java/com/devonfw/tools/ide/context/ProcessContextGitMock.java
+++ b/cli/src/test/java/com/devonfw/tools/ide/context/ProcessContextGitMock.java
@@ -147,7 +147,9 @@ public ProcessResult run(ProcessMode processMode) {
       }
     }
     this.arguments.clear();
-    return new ProcessResultImpl("git", command.toString(), exitCode, this.outputMessages);
+    List<OutputMessage> outputMessagesCopy = List.copyOf(this.outputMessages);
+    this.outputMessages.clear();
+    return new ProcessResultImpl("git", command.toString(), exitCode, outputMessagesCopy);
   }
 
 }