add test case

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1919064 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -99,6 +99,7 @@ public class TestAllFiles {
 
         // corrupt file
         "spreadsheet/duplicate-filename.xlsx",
+        "spreadsheet/duplicate-filename-case-insensitive.xlsx",
         "document/clusterfuzz-testcase-minimized-POIXWPFFuzzer-5166796835258368.docx",
     };
 

poi-ooxml/src/test/java/org/apache/poi/xssf/usermodel/TestXSSFWorkbook.java

@@ -1475,6 +1475,15 @@ public final class TestXSSFWorkbook extends BaseTestXWorkbook {
         });
     }
 
+    @Test
+    void testDuplicateFileCaseInsensitiveReadAsStream() {
+        assertThrows(InvalidZipException.class, () -> {
+            try (XSSFWorkbook wb = new XSSFWorkbook(openSampleFileStream("duplicate-filename-case-insensitive.xlsx"))) {
+                // expect exception here
+            }
+        });
+    }
+
     @Test
     void testWorkbookCloseClosesInputStream() throws Exception {
         try (TrackingInputStream stream = new TrackingInputStream(