another dataformatter test

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1918810 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -158,4 +158,18 @@ public final class TestXSSFDataFormat extends BaseTestDataFormat {
             */
         }
     }
+
+    @Test
+    public void testFormatCellValueDecimal() throws IOException {
+        DataFormatter df = new DataFormatter();
+
+        try (Workbook wb = new XSSFWorkbook()) {
+            Cell cell = wb.createSheet("test").createRow(0).createCell(0);
+            assertEquals("", df.formatCellValue(cell));
+
+            cell.setCellValue(1.005);
+            assertEquals("1.005", df.formatCellValue(cell));
+        }
+    }
+
 }