Try to fix flaky test by waiting for a switch of the second to ensure that we have the same timestamps in the two workbooks that we compare byte-wise in this test.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1677950 13f79535-47bb-0310-9956-ffa450edef68

src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFBugs.java

@@ -1561,6 +1561,15 @@ public final class TestXSSFBugs extends BaseTestBugzillaIssues {
         cell.setCellValue("Hi");
         sheet.setRepeatingRows(new CellRangeAddress(0, 0, 0, 0));
         
+        // small hack to try to make this test stable, previously it failed whenever the two written ZIP files had different file-creation
+        // dates stored.
+        // We try to do a loop until the current second changes in order to avoid problems with some date information that is written to the ZIP and thus
+        // causes differences
+        long start = System.currentTimeMillis()/1000;
+        while(System.currentTimeMillis()/1000 == start) {
+            Thread.sleep(10);
+        }
+        
         ByteArrayOutputStream bos = new ByteArrayOutputStream(8096);
         wb.write(bos);
         byte firstSave[] = bos.toByteArray();
@@ -1568,6 +1577,13 @@ public final class TestXSSFBugs extends BaseTestBugzillaIssues {
         wb.write(bos);
         byte secondSave[] = bos.toByteArray();
         
+        /*OutputStream stream = new FileOutputStream("C:\\temp\\poi.xlsx");
+        try {
+            wb.write(stream);
+        } finally {
+            stream.close();
+        }*/
+        
         assertArrayEquals("Had: \n" + Arrays.toString(firstSave) + " and \n" + Arrays.toString(secondSave),  
                 firstSave, secondSave);
         
@@ -2439,7 +2455,7 @@ public final class TestXSSFBugs extends BaseTestBugzillaIssues {
         
         wb.close();
     }
-    
+
     /**
      * .xlsx supports 64000 cell styles, the style indexes after
      *  32,767 must not be -32,768, then -32,767, -32,766