[bug-66052] add test

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1902637 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/poi-ooxml/src/test/java/org/apache/poi/xssf/TestSSUtilVsXSSFColor.java b/poi-ooxml/src/test/java/org/apache/poi/xssf/TestSSUtilVsXSSFColor.java
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+++ b/poi-ooxml/src/test/java/org/apache/poi/xssf/TestSSUtilVsXSSFColor.java
@@ -0,0 +1,66 @@
+package org.apache.poi.xssf;
+
+import org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream;
+import org.apache.poi.ss.usermodel.*;
+import org.apache.poi.ss.util.CellRangeAddress;
+import org.apache.poi.ss.util.PropertyTemplate;
+import org.apache.poi.xssf.usermodel.*;
+import org.apache.commons.codec.binary.Hex;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+
+class TestSSUtilVsXSSFColor {
+
+    @Test
+    void testXSSFCellStyle() throws Exception {
+
+        try (
+                XSSFWorkbook workbook = new XSSFWorkbook();
+                UnsynchronizedByteArrayOutputStream bos = new UnsynchronizedByteArrayOutputStream()
+        ) {
+            XSSFCellStyle cellStyle = workbook.createCellStyle();
+            final String rgbS = "ffff00";
+            final byte[] rgbB = Hex.decodeHex(rgbS);
+            IndexedColorMap colorMap = workbook.getStylesSource().getIndexedColors();
+            XSSFColor color = new XSSFColor(rgbB, colorMap);
+            cellStyle.setFillForegroundColor(color);
+            cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
+
+            final int startDataRow = 6; // row 7 (index 0-based)
+            final int endDataRow = 11; // row 12 (index 0-based)
+            final int startDataColumn = 1; // column B (index 0-based)
+            final int endDataColumn = 10; // column K (index 0-based)
+
+            Sheet sheet = workbook.createSheet();
+
+            for (int r = startDataRow; r <= endDataRow; r++) {
+                Row row = sheet.createRow(r);
+                for (int c = startDataColumn; c <= endDataColumn; c++) {
+                    Cell cell = row.createCell(c);
+                    cell.setCellValue(cell.getAddress().formatAsString());
+                    cell.setCellStyle(cellStyle);
+                }
+            }
+
+            PropertyTemplate propertyTemplate = new PropertyTemplate();
+            propertyTemplate.drawBorders(new CellRangeAddress(startDataRow, endDataRow, startDataColumn, endDataColumn),
+                    BorderStyle.MEDIUM, BorderExtent.ALL);
+
+            propertyTemplate.applyBorders(sheet); // after this all cell interiors are filled black, because IndexedColors 0 is set
+            // same is using all other org.apache.poi.ss.util classes which manipulate cell styles (CellUtil or RegionUtil)
+
+            workbook.write(bos);
+
+            try(XSSFWorkbook wb2 = new XSSFWorkbook(bos.toInputStream())) {
+                XSSFSheet sheetWb2 = wb2.getSheetAt(0);
+                XSSFCell testCell = sheetWb2.getRow(startDataRow).getCell(startDataColumn);
+                XSSFCellStyle testStyle = testCell.getCellStyle();
+                XSSFColor testColor = testStyle.getFillForegroundXSSFColor();
+                assertFalse(testColor.isIndexed());
+                assertEquals(rgbS, Hex.encodeHexString(testColor.getRGB()));
+            }
+        }
+    }
+}
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