List expected failures in stress.xls instead of fully excluding them

We list expected failures in stress.xls to verify that
the error message is correct and no unexpected exception
is introduced

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1919212 13f79535-47bb-0310-9956-ffa450edef68

poi-integration/src/test/java/org/apache/poi/stress/TestAllFiles.java

@@ -97,11 +97,8 @@ public class TestAllFiles {
         "poifs/60320-protected.xlsx",
         "poifs/protected_sha512.xlsx",
 
-        // corrupt file
-        "document/unicode-path.docx",
-        "spreadsheet/duplicate-filename.xlsx",
-        "spreadsheet/duplicate-filename-case-insensitive.xlsx",
-        "document/clusterfuzz-testcase-minimized-POIXWPFFuzzer-5166796835258368.docx",
+        // NOTE: Expected failures should usually be added in file "stress.xls" instead
+        // of being listed here in order to also verify the expected exception details!
     };
 
     // cheap workaround of skipping the few problematic files