Add test to show that bug #43251 is already fixed

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@638804 13f79535-47bb-0310-9956-ffa450edef68

src/testcases/org/apache/poi/hssf/usermodel/TestBugs.java

@@ -1136,6 +1136,20 @@ extends TestCase {
         //assertEquals("=CHOOSE(2,A2,A3,A4)", c2.getCellFormula());
     }
     
+    /**
+     * Something up with the FileSharingRecord
+     */
+    public void test43251() throws Exception {
+        FileInputStream in = new FileInputStream(new File(cwd, "43251.xls"));
+        
+        // Used to blow up with an IllegalArgumentException
+        //  when creating a FileSharingRecord
+        HSSFWorkbook wb = new HSSFWorkbook(in);
+        in.close();
+        
+        assertEquals(1, wb.getNumberOfSheets());
+    }
+    
     /**
      * Crystal reports generates files with short 
      *  StyleRecords, which is against the spec