[bug-60541] fix issue with setColumnAttributes

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1897678 13f79535-47bb-0310-9956-ffa450edef68

poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/XSSFSheet.java

@@ -1600,6 +1600,7 @@ public class XSSFSheet extends POIXMLDocumentPart implements Sheet, OoxmlSheetEx
     public void groupColumn(int fromColumn, int toColumn) {
         groupColumn1Based(fromColumn+1, toColumn+1);
     }
+
     private void groupColumn1Based(int fromColumn, int toColumn) {
         CTCols ctCols=worksheet.getColsArray(0);
         CTCol ctCol=CTCol.Factory.newInstance();
@@ -2314,7 +2315,7 @@ public class XSSFSheet extends POIXMLDocumentPart implements Sheet, OoxmlSheetEx
         CTCol col = columnHelper.getColumn(columnIndex, false);
         int colInfoIx = columnHelper.getIndexOfColumn(cols, col);
 
-        int idx = findColInfoIdx(Math.toIntExact(col.getMax()), colInfoIx);
+        int idx = col == null ? -1 : findColInfoIdx(Math.toIntExact(col.getMax()), colInfoIx);
         if (idx == -1) {
             return;
         }
@@ -2329,7 +2330,7 @@ public class XSSFSheet extends POIXMLDocumentPart implements Sheet, OoxmlSheetEx
         int endIdx = findEndOfColumnOutlineGroup(idx);
 
         // expand:
-        // colapsed bit must be unset
+        // collapsed bit must be unset
         // hidden bit gets unset _if_ surrounding groups are expanded you can
         // determine
         // this by looking at the hidden bit of the enclosing group. You will

poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/helpers/ColumnHelper.java

@@ -255,7 +255,6 @@ public class ColumnHelper {
         if(fromCol.isSetCollapsed()) toCol.setCollapsed(fromCol.getCollapsed());
         if(fromCol.isSetPhonetic()) toCol.setPhonetic(fromCol.getPhonetic());
         if(fromCol.isSetOutlineLevel()) toCol.setOutlineLevel(fromCol.getOutlineLevel());
-        toCol.setCollapsed(fromCol.isSetCollapsed());
     }
 
     public void setColBestFit(long index, boolean bestFit) {

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

@@ -45,6 +45,7 @@ import java.util.function.Function;
 import java.util.stream.Collectors;
 import java.util.stream.StreamSupport;
 
+import org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream;
 import org.apache.poi.hssf.HSSFTestDataSamples;
 import org.apache.poi.ooxml.POIXMLException;
 import org.apache.poi.poifs.crypt.CryptoFunctions;
@@ -329,7 +330,7 @@ public final class TestXSSFSheet extends BaseTestXSheet {
             sheet.removeMergedRegion(0);
             assertEquals(0, sheet.getNumMergedRegions());
             assertNull(sheet.getCTWorksheet().getMergeCells(),
-                "CTMergeCells should be deleted after removing the last merged region on the sheet.");
+                    "CTMergeCells should be deleted after removing the last merged region on the sheet.");
             assertEquals(0, sheet.addMergedRegion(region_1));
             assertEquals(1, sheet.addMergedRegion(region_2));
             assertEquals(2, sheet.addMergedRegion(region_3));
@@ -370,6 +371,195 @@ public final class TestXSSFSheet extends BaseTestXSheet {
         }
     }
 
+    @Test
+    void saveGroupColumns() throws IOException {
+        try (
+                XSSFWorkbook workbook = new XSSFWorkbook();
+                UnsynchronizedByteArrayOutputStream bos = new UnsynchronizedByteArrayOutputStream()
+        ) {
+            XSSFSheet sheet = workbook.createSheet();
+            XSSFRow row0 = sheet.createRow(0);
+            XSSFRow row1 = sheet.createRow(1);
+            for (int i = 0; i < 8; i++) {
+                XSSFCell cell0 = row0.createCell(i);
+                cell0.setCellValue("Col" + CellReference.convertNumToColString(cell0.getColumnIndex()));
+                XSSFCell cell1 = row1.createCell(i);
+                cell1.setCellValue(cell1.getAddress().formatAsString());
+            }
+
+            sheet.groupColumn(2, 3);
+            sheet.groupColumn(5, 7);
+
+            workbook.write(bos);
+
+            try (XSSFWorkbook wb2 = new XSSFWorkbook(bos.toInputStream())) {
+                XSSFSheet wb2Sheet = wb2.getSheetAt(0);
+                CTCols cols = wb2Sheet.getCTWorksheet().getColsArray(0);
+                assertEquals(2, cols.sizeOfColArray());
+                CTCol col0 = cols.getColArray(0);
+                CTCol col1 = cols.getColArray(1);
+                assertEquals(3, col0.getMin());
+                assertEquals(4, col0.getMax());
+                assertFalse(col0.getHidden());
+                assertFalse(col0.getCollapsed());
+                assertEquals(6, col1.getMin());
+                assertEquals(8, col1.getMax());
+                assertFalse(col1.getHidden());
+                assertFalse(col1.getCollapsed());
+            }
+        }
+    }
+
+    @Test
+    void collapseGroupColumn() throws IOException {
+        try (XSSFWorkbook workbook = new XSSFWorkbook()) {
+            XSSFSheet sheet = workbook.createSheet();
+            XSSFRow row0 = sheet.createRow(0);
+            XSSFRow row1 = sheet.createRow(1);
+            for (int i = 0; i < 8; i++) {
+                XSSFCell cell0 = row0.createCell(i);
+                cell0.setCellValue("Col" + CellReference.convertNumToColString(cell0.getColumnIndex()));
+                XSSFCell cell1 = row1.createCell(i);
+                cell1.setCellValue(cell1.getAddress().formatAsString());
+            }
+
+            sheet.groupColumn(2, 3);
+            sheet.groupColumn(5, 7);
+
+            CTCols cols = sheet.getCTWorksheet().getColsArray(0);
+            assertEquals(2, cols.sizeOfColArray());
+            CTCol col0 = cols.getColArray(0);
+            CTCol col1 = cols.getColArray(1);
+            assertEquals(3, col0.getMin());
+            assertEquals(4, col0.getMax());
+            assertFalse(col0.getHidden());
+            assertFalse(col0.getCollapsed());
+            assertEquals(6, col1.getMin());
+            assertEquals(8, col1.getMax());
+            assertFalse(col1.getHidden());
+            assertFalse(col1.getCollapsed());
+
+            sheet.setColumnGroupCollapsed(3, true);
+            cols = sheet.getCTWorksheet().getColsArray(0);
+            assertEquals(3, cols.sizeOfColArray());
+            col0 = cols.getColArray(0);
+            col1 = cols.getColArray(1);
+            CTCol col2 = cols.getColArray(2);
+            assertEquals(3, col0.getMin());
+            assertEquals(4, col0.getMax());
+            assertTrue(col0.getHidden());
+            assertFalse(col0.getCollapsed());
+            assertEquals(5, col1.getMin());
+            assertEquals(5, col1.getMax());
+            assertFalse(col1.getHidden());
+            assertTrue(col1.getCollapsed());
+            assertEquals(6, col2.getMin());
+            assertEquals(8, col2.getMax());
+            assertFalse(col2.getHidden());
+            assertFalse(col2.getCollapsed());
+        }
+    }
+
+    @Test
+    void expandGroupColumn() throws IOException {
+        try (XSSFWorkbook workbook = new XSSFWorkbook()) {
+            XSSFSheet sheet = workbook.createSheet();
+            XSSFRow row0 = sheet.createRow(0);
+            XSSFRow row1 = sheet.createRow(1);
+            for (int i = 0; i < 8; i++) {
+                XSSFCell cell0 = row0.createCell(i);
+                cell0.setCellValue("Col" + CellReference.convertNumToColString(cell0.getColumnIndex()));
+                XSSFCell cell1 = row1.createCell(i);
+                cell1.setCellValue(cell1.getAddress().formatAsString());
+            }
+
+            sheet.groupColumn(2, 3);
+            sheet.groupColumn(5, 7);
+
+            sheet.setColumnGroupCollapsed(3, true);
+            CTCols cols = sheet.getCTWorksheet().getColsArray(0);
+            assertEquals(3, cols.sizeOfColArray());
+            CTCol col0 = cols.getColArray(0);
+            CTCol col1 = cols.getColArray(1);
+            CTCol col2 = cols.getColArray(2);
+            assertEquals(3, col0.getMin());
+            assertEquals(4, col0.getMax());
+            assertTrue(col0.getHidden());
+            assertFalse(col0.getCollapsed());
+            assertEquals(5, col1.getMin());
+            assertEquals(5, col1.getMax());
+            assertFalse(col1.getHidden());
+            assertTrue(col1.getCollapsed());
+            assertEquals(6, col2.getMin());
+            assertEquals(8, col2.getMax());
+            assertFalse(col2.getHidden());
+            assertFalse(col2.getCollapsed());
+
+            sheet.setColumnGroupCollapsed(3, false);
+            cols = sheet.getCTWorksheet().getColsArray(0);
+            assertEquals(3, cols.sizeOfColArray());
+            col0 = cols.getColArray(0);
+            col1 = cols.getColArray(1);
+            col2 = cols.getColArray(2);
+            assertEquals(3, col0.getMin());
+            assertEquals(4, col0.getMax());
+            assertFalse(col0.getHidden());
+            assertFalse(col0.getCollapsed());
+            assertEquals(5, col1.getMin());
+            assertEquals(5, col1.getMax());
+            assertFalse(col1.getHidden());
+            assertFalse(col1.getCollapsed());
+            assertEquals(6, col2.getMin());
+            assertEquals(8, col2.getMax());
+            assertFalse(col2.getHidden());
+            assertFalse(col2.getCollapsed());
+        }
+    }
+
+    @Test
+    void collapseNonExistentGroupColumn() throws IOException {
+        try (XSSFWorkbook workbook = new XSSFWorkbook()) {
+            XSSFSheet sheet = workbook.createSheet();
+            XSSFRow row0 = sheet.createRow(0);
+            XSSFRow row1 = sheet.createRow(1);
+            for (int i = 0; i < 8; i++) {
+                XSSFCell cell0 = row0.createCell(i);
+                cell0.setCellValue("Col" + CellReference.convertNumToColString(cell0.getColumnIndex()));
+                XSSFCell cell1 = row1.createCell(i);
+                cell1.setCellValue(cell1.getAddress().formatAsString());
+            }
+
+            sheet.groupColumn(2, 3);
+            sheet.groupColumn(5, 7);
+
+            CTCols cols = sheet.getCTWorksheet().getColsArray(0);
+            assertEquals(2, cols.sizeOfColArray());
+            CTCol col0 = cols.getColArray(0);
+            CTCol col1 = cols.getColArray(1);
+            assertEquals(3, col0.getMin());
+            assertEquals(4, col0.getMax());
+            assertFalse(col0.getHidden());
+            assertFalse(col0.getCollapsed());
+            assertEquals(6, col1.getMin());
+            assertEquals(8, col1.getMax());
+            assertFalse(col1.getHidden());
+            assertFalse(col1.getCollapsed());
+
+            sheet.setColumnGroupCollapsed(4, true); //has no effect, col 4 is not in a group
+            cols = sheet.getCTWorksheet().getColsArray(0);
+            assertEquals(2, cols.sizeOfColArray());
+            col0 = cols.getColArray(0);
+            col1 = cols.getColArray(1);
+            assertEquals(3, col0.getMin());
+            assertEquals(4, col0.getMax());
+            assertFalse(col0.getHidden());
+            assertFalse(col0.getCollapsed());
+            assertEquals(6, col1.getMin());
+            assertEquals(8, col1.getMax());
+            assertFalse(col1.getHidden());
+            assertFalse(col1.getCollapsed());
+        }
+    }
 
     @Test
     void groupUngroupColumn() throws IOException {
@@ -486,28 +676,29 @@ public final class TestXSSFSheet extends BaseTestXSheet {
             sheet1.groupColumn(4, 7);
 
             assertEquals(1, cols.sizeOfColArray());
-            checkColumnGroup(cols.getColArray(0), 4, 7); // false, true
+            checkColumnGroup(cols.getColArray(0), 4, 7, false, false);
 
             sheet1.groupColumn(9, 12);
 
             assertEquals(2, cols.sizeOfColArray());
-            checkColumnGroup(cols.getColArray(0), 4, 7); // false, true
-            checkColumnGroup(cols.getColArray(1), 9, 12); // false, true
+            checkColumnGroup(cols.getColArray(0), 4, 7, false, false);
+            checkColumnGroup(cols.getColArray(1), 9, 12, false, false);
 
             sheet1.groupColumn(10, 11);
 
             assertEquals(4, cols.sizeOfColArray());
-            checkColumnGroup(cols.getColArray(0), 4, 7); // false, true
-            checkColumnGroup(cols.getColArray(1), 9, 9); // false, true
-            checkColumnGroup(cols.getColArray(2), 10, 11); // false, true
-            checkColumnGroup(cols.getColArray(3), 12, 12); // false, true
+            checkColumnGroup(cols.getColArray(0), 4, 7, false, false);
+            checkColumnGroup(cols.getColArray(1), 9, 9, false, false);
+            checkColumnGroup(cols.getColArray(2), 10, 11, false, false);
+            checkColumnGroup(cols.getColArray(3), 12, 12, false, false);
 
             // collapse columns - 1
             sheet1.setColumnGroupCollapsed(5, true);
 
-            // FIXME: we grew a column?
+            //TODO setColumnGroupCollapsed is currently broken (and may never have worked well)
+            // FIXME: we grew a column? -- this whole section needs investigation
             assertEquals(5, cols.sizeOfColArray());
-            checkColumnGroupIsCollapsed(cols.getColArray(0), 4, 7); // true, true
+            checkColumnGroupIsCollapsed(cols.getColArray(0), 4, 7);
             checkColumnGroup(cols.getColArray(1), 8, 8); // false, true
             checkColumnGroup(cols.getColArray(2), 9, 9); // false, true
             checkColumnGroup(cols.getColArray(3), 10, 11); // false, true
@@ -518,22 +709,22 @@ public final class TestXSSFSheet extends BaseTestXSheet {
             sheet1.setColumnGroupCollapsed(5, false);
             assertEquals(5, cols.sizeOfColArray());
 
-            checkColumnGroupIsExpanded(cols.getColArray(0), 4, 7); // false, true
+            checkColumnGroupIsExpanded(cols.getColArray(0), 4, 7);
             checkColumnGroup(cols.getColArray(1), 8, 8, false, false);
-            checkColumnGroup(cols.getColArray(2), 9, 9); // false, true
-            checkColumnGroup(cols.getColArray(3), 10, 11); // false, true
-            checkColumnGroup(cols.getColArray(4), 12, 12); // false, true
+            checkColumnGroup(cols.getColArray(2), 9, 9, false, false);
+            checkColumnGroup(cols.getColArray(3), 10, 11, false, false);
+            checkColumnGroup(cols.getColArray(4), 12, 12, false, false);
 
 
             //collapse - 2
             sheet1.setColumnGroupCollapsed(9, true);
             // it grew again?
             assertEquals(6, cols.sizeOfColArray());
-            checkColumnGroup(cols.getColArray(0), 4, 7); // false, true
+            checkColumnGroup(cols.getColArray(0), 4, 7, false, false);
             checkColumnGroup(cols.getColArray(1), 8, 8, false, false);
-            checkColumnGroupIsCollapsed(cols.getColArray(2), 9, 9); // true, true
-            checkColumnGroupIsCollapsed(cols.getColArray(3), 10, 11); // true, true
-            checkColumnGroupIsCollapsed(cols.getColArray(4), 12, 12); // true, true
+            checkColumnGroupIsCollapsed(cols.getColArray(2), 9, 9); // true, true);
+            checkColumnGroupIsCollapsed(cols.getColArray(3), 10, 11); // true, true);
+            checkColumnGroupIsCollapsed(cols.getColArray(4), 12, 12); // true, true);
             // why was this column group added?
             checkColumnGroup(cols.getColArray(5), 13, 13); // false, true
 
@@ -579,12 +770,12 @@ public final class TestXSSFSheet extends BaseTestXSheet {
                 cols = sheet1.getCTWorksheet().getColsArray(0);
 
                 assertEquals(6, cols.sizeOfColArray());
-                checkColumnGroup(cols.getColArray(0), 4, 7, false, true);
-                checkColumnGroup(cols.getColArray(1), 8, 8, false, true);
-                checkColumnGroup(cols.getColArray(2), 9, 9, false, true);
-                checkColumnGroup(cols.getColArray(3), 10, 11, false, true);
-                checkColumnGroup(cols.getColArray(4), 12, 12, false, true);
-                checkColumnGroup(cols.getColArray(5), 13, 13, false, true);
+                checkColumnGroup(cols.getColArray(0), 4, 7, false, false);
+                checkColumnGroup(cols.getColArray(1), 8, 8, false, false);
+                checkColumnGroup(cols.getColArray(2), 9, 9, false, false);
+                checkColumnGroup(cols.getColArray(3), 10, 11, false, false);
+                checkColumnGroup(cols.getColArray(4), 12, 12, false, false);
+                checkColumnGroup(cols.getColArray(5), 13, 13, false, false);
             }
         }
     }
@@ -600,8 +791,7 @@ public final class TestXSSFSheet extends BaseTestXSheet {
     private static void checkColumnGroup(
             CTCol col,
             int fromColumnIndex, int toColumnIndex,
-            boolean isSetHidden, boolean isSetCollapsed
-            ) {
+            boolean isSetHidden, boolean isSetCollapsed) {
         assertEquals(fromColumnIndex, col.getMin() - 1, "from column index"); // 1 based
         assertEquals(toColumnIndex, col.getMax() - 1, "to column index"); // 1 based
         assertEquals(isSetHidden, col.isSetHidden(), "isSetHidden");
@@ -619,7 +809,6 @@ public final class TestXSSFSheet extends BaseTestXSheet {
         assertEquals(fromColumnIndex, col.getMin() - 1, "from column index"); // 1 based
         assertEquals(toColumnIndex, col.getMax() - 1, "to column index"); // 1 based
         assertFalse(col.isSetHidden(), "isSetHidden");
-        assertTrue(col.isSetCollapsed(), "isSetCollapsed"); //not necessarily set
     }
 
     /**
@@ -630,11 +819,25 @@ public final class TestXSSFSheet extends BaseTestXSheet {
      * @param toColumnIndex 0-indexed
      */
     private static void checkColumnGroupIsCollapsed(CTCol col, int fromColumnIndex, int toColumnIndex) {
+        checkColumnGroupIsCollapsed(col, fromColumnIndex, toColumnIndex, false, false);
+    }
+
+    /**
+     * Verify that column groups were created correctly after Sheet.groupColumn
+     *
+     * @param col the column group xml bean
+     * @param fromColumnIndex 0-indexed
+     * @param toColumnIndex 0-indexed
+     */
+    private static void checkColumnGroupIsCollapsed(CTCol col, int fromColumnIndex, int toColumnIndex,
+                                                    boolean isSetCollapsed, boolean collapsed) {
         assertEquals(fromColumnIndex, col.getMin() - 1, "from column index"); // 1 based
         assertEquals(toColumnIndex, col.getMax() - 1, "to column index"); // 1 based
         assertTrue(col.isSetHidden(), "isSetHidden");
-        assertTrue(col.isSetCollapsed(), "isSetCollapsed");
-        //assertTrue(col.getCollapsed(), "getCollapsed");
+        assertEquals(isSetCollapsed, col.isSetCollapsed(), "isSetCollapsed");
+        if (isSetCollapsed) {
+            assertEquals(collapsed, col.getCollapsed(), "getCollapsed");
+        }
     }
 
     /**
@@ -649,9 +852,7 @@ public final class TestXSSFSheet extends BaseTestXSheet {
         assertEquals(fromColumnIndex, col.getMin() - 1, "from column index"); // 1 based
         assertEquals(toColumnIndex, col.getMax() - 1, "to column index"); // 1 based
         assertFalse(col.isSetHidden(), "isSetHidden");
-        assertTrue(col.isSetCollapsed(), "isSetCollapsed");
-        //assertTrue(!col.isSetCollapsed() || !col.getCollapsed(), "isSetCollapsed");
-        //assertFalse(col.getCollapsed(), "getCollapsed");
+        assertTrue(!col.isSetCollapsed() || !col.getCollapsed(), "isSetCollapsed");
     }
 
     /**
@@ -1202,13 +1403,13 @@ public final class TestXSSFSheet extends BaseTestXSheet {
 
     @ParameterizedTest
     @CsvSource(value = {
-        // run with the file provided in the Bug-Report
-        "54607.xlsx, '1, 0, 0', '0, 0, 0'",
+            // run with the file provided in the Bug-Report
+            "54607.xlsx, '1, 0, 0', '0, 0, 0'",
 
-        // run with some other flie to see
-        "54436.xlsx, '0', '0'",
-        "TwoSheetsNoneHidden.xlsx, '0, 0', '0, 0'",
-        "TwoSheetsNoneHidden.xls, '0, 0', '0, 0'"
+            // run with some other flie to see
+            "54436.xlsx, '0', '0'",
+            "TwoSheetsNoneHidden.xlsx, '0, 0', '0, 0'",
+            "TwoSheetsNoneHidden.xls, '0, 0', '0, 0'"
     })
     void bug54607(String file, String topRows, String leftCols) throws IOException {
         Consumer<Workbook> testFun = (wb) -> {
@@ -1219,8 +1420,8 @@ public final class TestXSSFSheet extends BaseTestXSheet {
                 wb.forEach(sh -> assertNotNull(sh.getSheetName()));
 
                 String act = StreamSupport.stream(Spliterators.spliterator(wb.iterator(), wb.getNumberOfSheets(), Spliterator.ORDERED), false).
-                    map(sh -> sheetFun.apply(sh).toString()).
-                    collect(Collectors.joining(", "));
+                        map(sh -> sheetFun.apply(sh).toString()).
+                        collect(Collectors.joining(", "));
 
                 assertEquals(exp, act);
             }

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

@@ -25,11 +25,13 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.io.IOException;
 
+import jdk.nashorn.internal.ir.annotations.Ignore;
 import org.apache.poi.ss.usermodel.Row;
 import org.apache.poi.ss.usermodel.Sheet;
 import org.apache.poi.ss.usermodel.Workbook;
 import org.apache.poi.xssf.model.StylesTable;
 import org.apache.poi.xssf.usermodel.XSSFCellStyle;
+import org.apache.poi.xssf.usermodel.XSSFRow;
 import org.apache.poi.xssf.usermodel.XSSFSheet;
 import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 import org.junit.jupiter.api.Test;
@@ -408,33 +410,43 @@ public final class TestColumnHelper {
 
     @SuppressWarnings("deprecation")
     @Test
-    void testColumnsCollapsed() {
-        Workbook wb = new XSSFWorkbook();
-        Sheet sheet = wb.createSheet("test");
-        Row row = sheet.createRow(0);
-        row.createCell(0);
-        row.createCell(1);
-        row.createCell(2);
-
-        sheet.setColumnWidth(0, 10);
-        sheet.setColumnWidth(1, 10);
-        sheet.setColumnWidth(2, 10);
-
-        sheet.groupColumn(0, 1);
-        sheet.setColumnGroupCollapsed(0, true);
-
-        CTCols ctCols = ((XSSFSheet) sheet).getCTWorksheet().getColsArray()[0];
-        assertEquals(3, ctCols.sizeOfColArray());
-        assertTrue(ctCols.getColArray(0).isSetCollapsed());
-        assertTrue(ctCols.getColArray(1).isSetCollapsed());
-        assertTrue(ctCols.getColArray(2).isSetCollapsed());
-
-        ColumnHelper helper = new ColumnHelper(CTWorksheet.Factory.newInstance());
-        helper.setColumnAttributes(ctCols.getColArray(1), ctCols.getColArray(2));
-
-        ctCols = ((XSSFSheet) sheet).getCTWorksheet().getColsArray()[0];
-        assertTrue(ctCols.getColArray(0).isSetCollapsed());
-        assertTrue(ctCols.getColArray(1).isSetCollapsed());
-        assertTrue(ctCols.getColArray(2).isSetCollapsed());
+    void testColumnsCollapsed() throws IOException {
+        try (XSSFWorkbook wb = new XSSFWorkbook()) {
+            XSSFSheet sheet = wb.createSheet("test");
+            XSSFRow row = sheet.createRow(0);
+            row.createCell(0);
+            row.createCell(1);
+            row.createCell(2);
+
+            sheet.setColumnWidth(0, 10);
+            sheet.setColumnWidth(1, 10);
+            sheet.setColumnWidth(2, 10);
+
+            CTCols ctCols = sheet.getCTWorksheet().getColsArray()[0];
+            CTCol col0 = ctCols.getColArray(0);
+            CTCol col1 = ctCols.getColArray(1);
+            CTCol col2 = ctCols.getColArray(2);
+            assertFalse(col0.getCollapsed());
+            assertFalse(col0.getHidden());
+            assertFalse(col1.getCollapsed());
+            assertFalse(col1.getHidden());
+            assertFalse(col2.getCollapsed());
+            assertFalse(col2.getHidden());
+
+            sheet.groupColumn(0, 1);
+            sheet.setColumnGroupCollapsed(0, true);
+
+            ctCols = sheet.getCTWorksheet().getColsArray()[0];
+            assertEquals(3, ctCols.sizeOfColArray());
+            col0 = ctCols.getColArray(0);
+            col1 = ctCols.getColArray(1);
+            col2 = ctCols.getColArray(2);
+            assertFalse(col0.getCollapsed());
+            assertTrue(col0.getHidden());
+            assertFalse(col1.getCollapsed());
+            assertTrue(col1.getHidden());
+            assertTrue(col2.getCollapsed());
+            assertFalse(col2.getHidden());
+        }
     }
 }